select组件最后一个字符删除不干净，需要二次删除

[mosuzi]

当动态加载options时，select的最后一个字符容易出现删不干净的问题，需要重新再来一遍，似乎是删除太快的问题，尚不清楚。
另外，为什么select的输入被删空的时候不会触发search事件呢，文档不是说文本框值变化时回调嘛

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