实现输入框文本全选功能，有两个API可供选择：
1. HTMLInputElement.select()
2. HTMLInputElement.setSelectionRange()
<input onClick="this.select();" value="via select()" />
<input onClick="this.setSelectionRange(0, this.value.length)" value="via setSelectionRange()" />
demo 地址：
codepen.io
1. HTMLInputElement.select()
2. HTMLInputElement.setSelectionRange()
<input onClick="this.select();" value="via select()" />
<input onClick="this.setSelectionRange(0, this.value.length)" value="via setSelectionRange()" />
demo 地址：
codepen.io
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