解决index索引组件存在的2个bug(1.索引首位字母定位不准确2.滑动超出边界报错) #244
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解决index索引组件存在的2个bug,以及删除一个多余tap事件:1.点击索引首位字母定位不准确2.滑动超出边界时报错3.删除索引的tap事件,因为catchtouchstart,catchtouchend后事件被阻止了,tap捕获不到,用已有的catchtouchstart代替索引点击就行