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<a class="post-title-link" href="/2019/02/09/Typescript-基础学习/" itemprop="url">Typescript 基础学习</a></h1>
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<p>为了写个小程序，正好以后入职也是要接触Typescript，先稍稍学习下基础，主要学习于<a href="https://www.tslang.cn/docs/home.html" target="_blank" rel="noopener">官方文档</a>。</p>
<h1 id="基础类型"><a href="#基础类型" class="headerlink" title="基础类型"></a>基础类型</h1><table>
<thead>
<tr>
<th>变量</th>
<th>代码表示</th>
<th>例子</th>
<th>备注</th>
</tr>
</thead>
<tbody>
<tr>
<td>布尔</td>
<td>boolean</td>
<td>false,true</td>
<td>无</td>
</tr>
<tr>
<td>数字</td>
<td>number</td>
<td>0x,0b,0o</td>
<td>只有浮点，支持十，十六，二，八进制</td>
</tr>
<tr>
<td>字符串</td>
<td>string</td>
<td></td>
<td>(用””或者’’包裹，也可以用’’包裹，${expr}嵌入)</td>
</tr>
<tr>
<td>数组</td>
<td>type[],Array<type></type></td>
<td></td>
<td></td>
</tr>
<tr>
<td>元组</td>
<td>[type1,type2]</td>
<td>[string,name]</td>
<td>用数组的形式包括两个类型就是元组，可以越界访问，会自动用联合类型替代</td>
</tr>
<tr>
<td>枚举</td>
<td>enum</td>
<td>enum Color {Red=1,Green,Blue}</td>
<td>可以手动赋予初始值</td>
</tr>
<tr>
<td>Any</td>
<td>any</td>
<td>any[]=[1,true,”free”]</td>
<td>可以视作任意，包括可以在上面调用函数</td>
</tr>
<tr>
<td>void</td>
<td></td>
<td>undefined,null</td>
<td></td>
</tr>
<tr>
<td>null和undefined</td>
<td></td>
<td></td>
<td>默认情况它们是所有类型的子类型，–strictNullChecks可以规定只能赋给void和它们自己，同时使用联合类型</td>
</tr>
<tr>
<td>Never</td>
<td>never</td>
<td>function error(message: string): never</td>
<td>永远不存在，必须在函数无返回，或者报错</td>
</tr>
<tr>
<td>object</td>
<td>非原始类型</td>
<td></td>
<td>除了number,string，boolean,symbol,null和undefined之外的类型</td>
</tr>
</tbody>
</table>
<p>类型断言的方式有两种,<string>someValue或者someValue as string</string></p>
<h1 id="变量声明"><a href="#变量声明" class="headerlink" title="变量声明"></a>变量声明</h1><p>let 和 const</p>
<h2 id="let"><a href="#let" class="headerlink" title="let"></a>let</h2><p>let的使用跟c++很像，不能重复定义，块级有效，可以覆盖，块级与变量环境绑定的，即使代码已经运行过去，环境依旧存在<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">function theCityThatAlwaysSleeps() {</span><br><span class="line"> let getCity;</span><br><span class="line"></span><br><span class="line"> if (true) {</span><br><span class="line"> let city = "Seattle";</span><br><span class="line"> getCity = function() {</span><br><span class="line"> return city;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> return getCity();</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>正如这里的例子，即使city已经执行完毕，return getCity()时依旧可以访问。</p>
<h2 id="const"><a href="#const" class="headerlink" title="const"></a>const</h2><p>const的特性与let一致，就是不能变动，维持不同的常量</p>
<h2 id="解构和展开"><a href="#解构和展开" class="headerlink" title="解构和展开"></a>解构和展开</h2><p>展开比较容易理解<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">let first = [1, 2];</span><br><span class="line">let second = [3, 4];</span><br><span class="line">let bothPlus = [0, ...first, ...second, 5];</span><br></pre></td></tr></table></figure></p>
<p>展开对象也可以，后面会覆盖钱前面相同属性，同时会丢失方法，只会展开可枚举的属性<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">let defaults = { food: "spicy", price: "$$", ambiance: "noisy" };</span><br><span class="line">let search = { ...defaults, food: "rich" };</span><br></pre></td></tr></table></figure></p>
<p>解构的理解，看了点其他博客，理解不够深入，先摘要写一下，以后有机会再来补充。<br>在开发过程中，我们经常遇到这样问题，需要将对象某个属性的值赋给其它两个变量代码如下：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">var person = {</span><br><span class="line"> name:'xxxx',</span><br><span class="line"> age: 20,</span><br><span class="line"> hobby:['football', 'run']</span><br><span class="line">}</span><br><span class="line"> </span><br><span class="line">var a = person.name;</span><br><span class="line">var hobby = person.bobby;</span><br></pre></td></tr></table></figure></p>
<p>有了解构，我们可以精简代码了<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">var person = {</span><br><span class="line"> name:'xxxx',</span><br><span class="line"> age: 20,</span><br><span class="line"> hobby:['football', 'run']</span><br><span class="line">}</span><br><span class="line">let {a, hobby} = person;</span><br><span class="line"> </span><br><span class="line">let [first] = person.hobby;</span><br></pre></td></tr></table></figure></p>
<p>数组解构<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">let input = [1, 2];</span><br><span class="line">let [first, second] = input;</span><br><span class="line">console.log(first); // outputs 1</span><br><span class="line">console.log(second); // outputs 2</span><br></pre></td></tr></table></figure></p>
<h1 id="接口"><a href="#接口" class="headerlink" title="接口"></a>接口</h1><p>因为之前一直没有实际用过接口，我目前对于接口的理解是一种定义和规定，接口本身不具有意义<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">interface LabelledValue {</span><br><span class="line"> label: string;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">function printLabel(labelledObj: LabelledValue) {</span><br><span class="line"> console.log(labelledObj.label);</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">let myObj = {size: 10, label: "Size 10 Object"};</span><br><span class="line">printLabel(myObj);</span><br></pre></td></tr></table></figure></p>
<p>满足比较条件就可以了，多的属性被忽略<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">interface SquareConfig {</span><br><span class="line"> color?: string;</span><br><span class="line"> width?: number;</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>可选属性用?号表示<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">interface Point {</span><br><span class="line"> readonly x: number;</span><br><span class="line"> readonly y: number;</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>readonly来表示只读，然而可选属性与多的属性结合会出错。<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">interface SquareConfig {</span><br><span class="line"> color?: string;</span><br><span class="line"> width?: number;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">function createSquare(config: SquareConfig): { color: string; area: number } {</span><br><span class="line"> // ...</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">let mySquare = createSquare({ colour: "red", width: 100 });</span><br></pre></td></tr></table></figure></p>
<p>上面这段colour是不行的，对象字面量会被特殊对待而且会经过额外属性检查，类型断言可以绕开检查，也可以添加索引签名。<br>接口也可以表示函数类型<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">interface SearchFunc {</span><br><span class="line"> (source: string, subString: string): boolean;</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>可索引类型具有一个索引签名，它描述了对象索引的类型，还有相应的索引返回值类型。<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">interface StringArray {</span><br><span class="line"> [index: number]: string;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">let myArray: StringArray;</span><br><span class="line">myArray = ["Bob", "Fred"];</span><br><span class="line"></span><br><span class="line">let myStr: string = myArray[0];</span><br></pre></td></tr></table></figure></p>
<p>TypeScript支持两种索引签名：字符串和数字。 可以同时使用两种类型的索引，但是数字索引的返回值必须是字符串索引返回值类型的子类型。<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">class Animal {</span><br><span class="line"> name: string;</span><br><span class="line">}</span><br><span class="line">class Dog extends Animal {</span><br><span class="line"> breed: string;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">// 错误：使用数值型的字符串索引，有时会得到完全不同的Animal!</span><br><span class="line">interface NotOkay {</span><br><span class="line"> [x: number]: Animal;</span><br><span class="line"> [x: string]: Dog;</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>接口同样可以跟java里一样，在类里面用implements关键字来实现它。<br>类静态部分与实例部分的区别，这里没懂<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">interface ClockConstructor {</span><br><span class="line"> new (hour: number, minute: number);</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">class Clock implements ClockConstructor {</span><br><span class="line"> currentTime: Date;</span><br><span class="line"> constructor(h: number, m: number) { }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>这样写会报错，因为constructor存在于类的静态部分，而类实现接口时只会对实例部分进行类型检查。<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line">interface ClockConstructor {</span><br><span class="line"> new (hour: number, minute: number): ClockInterface;</span><br><span class="line">}</span><br><span class="line">interface ClockInterface {</span><br><span class="line"> tick();</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">function createClock(ctor: ClockConstructor, hour: number, minute: number): ClockInterface {</span><br><span class="line"> return new ctor(hour, minute);</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">class DigitalClock implements ClockInterface {</span><br><span class="line"> constructor(h: number, m: number) { }</span><br><span class="line"> tick() {</span><br><span class="line"> console.log("beep beep");</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line">class AnalogClock implements ClockInterface {</span><br><span class="line"> constructor(h: number, m: number) { }</span><br><span class="line"> tick() {</span><br><span class="line"> console.log("tick tock");</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">let digital = createClock(DigitalClock, 12, 17);</span><br><span class="line">let analog = createClock(AnalogClock, 7, 32);</span><br></pre></td></tr></table></figure></p>
<p>而这样写才是对的。这里贴上一个链接<a href="https://stackoverflow.com/questions/39622778/what-is-new-in-typescript" target="_blank" rel="noopener">what is new() in Typescript?</a><br>接口也可以继承，一个接口可以继承多个接口，创造出多个接口的组合。<br>混合类型表示一个对象可以同时作为函数和对象，简直了…<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">interface Counter {</span><br><span class="line"> (start: number): string;</span><br><span class="line"> interval: number;</span><br><span class="line"> reset(): void;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">function getCounter(): Counter {</span><br><span class="line"> let counter = <Counter>function (start: number) { };</span><br><span class="line"> counter.interval = 123;</span><br><span class="line"> counter.reset = function () { };</span><br><span class="line"> return counter;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">let c = getCounter();</span><br><span class="line">c(10);</span><br><span class="line">c.reset();</span><br><span class="line">c.interval = 5.0;</span><br></pre></td></tr></table></figure></p>
<p>接口可以继承类，同样会继承公有，私有或受保护的成员，所以接口只能被继承的类的子类来实现。<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line">class Control {</span><br><span class="line"> private state: any;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">interface SelectableControl extends Control {</span><br><span class="line"> select(): void;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">class Button extends Control implements SelectableControl {</span><br><span class="line"> select() { }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">class TextBox extends Control {</span><br><span class="line"> select() { }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">// 错误：“Image”类型缺少“state”属性。</span><br><span class="line">class Image implements SelectableControl {</span><br><span class="line"> select() { }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">class Location {</span><br><span class="line"></span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<h1 id="类"><a href="#类" class="headerlink" title="类"></a>类</h1><p>基本的类时一致的，类定义，继承，公有，私有，受保护等属性。<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">class Animal {</span><br><span class="line"> public name: string;</span><br><span class="line"> public constructor(theName: string) { this.name = theName; }</span><br><span class="line"> public move(distanceInMeters: number) {</span><br><span class="line"> console.log(`${this.name} moved ${distanceInMeters}m.`);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>默认是公有的，readonly保证了只读。<br>参数属性,可以将声明和赋值合并到一处。<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">class Octopus {</span><br><span class="line"> readonly numberOfLegs: number = 8;</span><br><span class="line"> constructor(readonly name: string) {</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>存取器，这个特性要关注一下，将读取和赋值分开了，可以单独进行更加详细的操作。<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line">let passcode = "secret passcode";</span><br><span class="line"></span><br><span class="line">class Employee {</span><br><span class="line"> private _fullName: string;</span><br><span class="line"></span><br><span class="line"> get fullName(): string {</span><br><span class="line"> return this._fullName;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> set fullName(newName: string) {</span><br><span class="line"> if (passcode && passcode == "secret passcode") {</span><br><span class="line"> this._fullName = newName;</span><br><span class="line"> }</span><br><span class="line"> else {</span><br><span class="line"> console.log("Error: Unauthorized update of employee!");</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">let employee = new Employee();</span><br><span class="line">employee.fullName = "Bob Smith";</span><br><span class="line">if (employee.fullName) {</span><br><span class="line"> alert(employee.fullName);</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>静态属性，static，访问要用类名字而不是this<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line">class Grid {</span><br><span class="line"> static origin = {x: 0, y: 0};</span><br><span class="line"> calculateDistanceFromOrigin(point: {x: number; y: number;}) {</span><br><span class="line"> let xDist = (point.x - Grid.origin.x);</span><br><span class="line"> let yDist = (point.y - Grid.origin.y);</span><br><span class="line"> return Math.sqrt(xDist * xDist + yDist * yDist) / this.scale;</span><br><span class="line"> }</span><br><span class="line"> constructor (public scale: number) { }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">let grid1 = new Grid(1.0); // 1x scale</span><br><span class="line">let grid2 = new Grid(5.0); // 5x scale</span><br><span class="line"></span><br><span class="line">console.log(grid1.calculateDistanceFromOrigin({x: 10, y: 10}));</span><br><span class="line">console.log(grid2.calculateDistanceFromOrigin({x: 10, y: 10}));</span><br></pre></td></tr></table></figure></p>
<p>抽象类，abstract关键字，跟接口类型，但是可以包含访问修饰符。<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br></pre></td><td class="code"><pre><span class="line">abstract class Department {</span><br><span class="line"></span><br><span class="line"> constructor(public name: string) {</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> printName(): void {</span><br><span class="line"> console.log('Department name: ' + this.name);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> abstract printMeeting(): void; // 必须在派生类中实现</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">class AccountingDepartment extends Department {</span><br><span class="line"></span><br><span class="line"> constructor() {</span><br><span class="line"> super('Accounting and Auditing'); // 在派生类的构造函数中必须调用 super()</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> printMeeting(): void {</span><br><span class="line"> console.log('The Accounting Department meets each Monday at 10am.');</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> generateReports(): void {</span><br><span class="line"> console.log('Generating accounting reports...');</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">let department: Department; // 允许创建一个对抽象类型的引用</span><br><span class="line">department = new Department(); // 错误: 不能创建一个抽象类的实例</span><br><span class="line">department = new AccountingDepartment(); // 允许对一个抽象子类进行实例化和赋值</span><br><span class="line">department.printName();</span><br><span class="line">department.printMeeting();</span><br><span class="line">department.generateReports(); // 错误: 方法在声明的抽象类中不存在</span><br></pre></td></tr></table></figure></p>
<p>类也可以当接口使用<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">class Point {</span><br><span class="line"> x: number;</span><br><span class="line"> y: number;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">interface Point3d extends Point {</span><br><span class="line"> z: number;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">let point3d: Point3d = {x: 1, y: 2, z: 3};</span><br></pre></td></tr></table></figure></p>
<p>构造函数这里需要额外注意，注意下面这段不常见的代码，可以体会下类和类实例的存在。<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line">class Greeter {</span><br><span class="line"> static standardGreeting = "Hello, there";</span><br><span class="line"> greeting: string;</span><br><span class="line"> greet() {</span><br><span class="line"> if (this.greeting) {</span><br><span class="line"> return "Hello, " + this.greeting;</span><br><span class="line"> }</span><br><span class="line"> else {</span><br><span class="line"> return Greeter.standardGreeting;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">let greeter1: Greeter;</span><br><span class="line">greeter1 = new Greeter();</span><br><span class="line">console.log(greeter1.greet());</span><br><span class="line"></span><br><span class="line">let greeterMaker: typeof Greeter = Greeter;</span><br><span class="line">greeterMaker.standardGreeting = "Hey there!";</span><br><span class="line"></span><br><span class="line">let greeter2: Greeter = new greeterMaker();</span><br><span class="line">console.log(greeter2.greet());</span><br></pre></td></tr></table></figure></p>
<p>类也是一种变量，或者说类的静态部分？感觉突然有些理解了。</p>
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<p>想整理下以后学习的经历并且督促自己学习，所以搭建了这样的博客，第一次记录下搭建的经历方便以后回顾。因为这个只准备给自己看，所以写的比较跳跃。</p>
<h1 id="初次搭建"><a href="#初次搭建" class="headerlink" title="初次搭建"></a>初次搭建</h1><p>主要是参照了<a href="https://www.simon96.online/2018/10/12/hexo-tutorial/" target="_blank" rel="noopener">这份教程</a>，写的非常完善，初次搭建过程中，只有一点需要注意。<br>修改_config.yml文件中<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">(# Deployment)</span><br><span class="line">(## Docs: https://hexo.io/docs/deployment.html)</span><br><span class="line">deploy:</span><br><span class="line"> type: git</span><br><span class="line"> repo: [email protected]:qiufan/qiufan.github.io.git</span><br><span class="line"> branch: master</span><br></pre></td></tr></table></figure></p>
<p>中repo的填写地址即是新开repo的ssh链接地址，这个需要注意，其他的指南说的不够明确，只是起了一样的名字。</p>
<h1 id="更换主题"><a href="#更换主题" class="headerlink" title="更换主题"></a>更换主题</h1><p>下载Next主题，看起来还不错，关键在于主题下面也有一个_config.yml文件里面可以用来修改参数配置</p>
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<p>Welcome to <a href="https://hexo.io/" target="_blank" rel="noopener">Hexo</a>! This is your very first post. Check <a href="https://hexo.io/docs/" target="_blank" rel="noopener">documentation</a> for more info. If you get any problems when using Hexo, you can find the answer in <a href="https://hexo.io/docs/troubleshooting.html" target="_blank" rel="noopener">troubleshooting</a> or you can ask me on <a href="https://github.com/hexojs/hexo/issues" target="_blank" rel="noopener">GitHub</a>.</p>
<h2 id="Quick-Start"><a href="#Quick-Start" class="headerlink" title="Quick Start"></a>Quick Start</h2><h3 id="Create-a-new-post"><a href="#Create-a-new-post" class="headerlink" title="Create a new post"></a>Create a new post</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo new <span class="string">"My New Post"</span></span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/writing.html" target="_blank" rel="noopener">Writing</a></p>
<h3 id="Run-server"><a href="#Run-server" class="headerlink" title="Run server"></a>Run server</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo server</span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/server.html" target="_blank" rel="noopener">Server</a></p>
<h3 id="Generate-static-files"><a href="#Generate-static-files" class="headerlink" title="Generate static files"></a>Generate static files</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo generate</span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/generating.html" target="_blank" rel="noopener">Generating</a></p>
<h3 id="Deploy-to-remote-sites"><a href="#Deploy-to-remote-sites" class="headerlink" title="Deploy to remote sites"></a>Deploy to remote sites</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo deploy</span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/deployment.html" target="_blank" rel="noopener">Deployment</a></p>
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