方法1: οnfοcus=this.blur() 当鼠标放不上就离开焦点
<input type="text" name="input1" value="()" οnfοcus=this.blur()>
方法2:readonly
<input type="text" name="input1" value="()" readonly> <input type="text" name="input1" value="中国" readonly="true">
方法3: disabled
<input type="text" name="input1" value="()" disabled="true">