修复低版本浏览器select组件在搜索时,按下backspace无法正确删除搜索关键字 #512
Merged
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由于低版本浏览器keydown的事件对象event中没有key或者code,导致无法正确删除关键字,低版本浏览器keydown的事件对象中应使用keyCode和which作为代替。