<!doctype html><html><head lang="en"> <meta charset="utf-8"> <title></title></head><body>省：<select id="sname"> <option>—请选择—</option></select>市：<select id="s_city"> <option>—请选择—</option></select>区：<select id="q_name"> <option>—请选择—</option></select><script> var sheng=["陕西省","四川省"]; var city=[ ["西安市","渭南市","宝鸡市"], ["成都市","绵阳市"] ] var qu=[ [ ["莲湖区","雁塔区","长安区"], ["渭南1区","渭南2区","渭南3区"], ["成仓区","金台区","高新区"], ], [ ["成都1区","成都2区","成都3区"], ["绵阳1区","绵阳2区","绵阳3区"] ] ] //先获取 var s=document.getelementbyid("sname"); var s_city=document.getelementbyid("s_city"); var q_name=document.getelementbyid("q_name"); //for循环使js里的sheng元素添加到s里 for(var i=0;i<sheng.length;i++) { var option=new option(sheng[i],i); s.appendchild(option); } //选择事件 var qucity; s.onchange=function (){ s_city.options.length=1; q_name.options.length=1; var index=this.value; var shi=city[index]; qucity=qu[index]; for(var i=0;i<shi.length;i++) { var option=new option(shi[i],i); s_city.appendchild(option) } } s_city.onchange=function (){ q_name.options.length=1; var index=this.value; var squ=qucity[index]; for(var i=0;i<squ.length;i++) { var option=new option(squ[i],i); q_name.appendchild(option); } }</script></body></html>
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