JavaScript实现支持区号输入的省市二级联动下拉菜单

<span onclick="inti(0)"> <select name=azone id="azone" onChange="this.value=this.options[this.selectedIndex].value;altcls();inps.value=optn.options[0].value;"> <option value="省份" disabled="disabled">省份</option> </select> <select name=cls id="cls" onChange="if(this.options[0].text!='选择城区')inps.value=this.options[this.selectedIndex].value;"> <option value=0>选择城区</option> </select> <input type="text" id="inps" name="inps" size="5" value="" onkeyup="if(this.value.length>1)inti(0);findarea();"> </span>  <span onclick="inti(1)"> <select name=azone id="azone1" onChange="this.value=this.options[this.selectedIndex].value;altcls();inps.value=optn.options[0].value;"> <option value="省份" disabled="disabled">省份</option> </select> <select name=cls id="cls1" onChange="if(this.options[0].text!='选择城区')inps.value=this.options[this.selectedIndex].value;"> <option value=0>选择城区</option> </select> <input type="text" id="inps1" name="inps" size="5" value="" onkeyup="if(this.value.length>1)inti(1);findarea();"> </span> 

[Ctrl+A 全选 注:引入外部Js需再刷新一下页面才能执行]