2019独角兽企业重金招聘Python工程师标准>>> 
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<head><title>javascript简单三级联动效果</title><meta http-equiv="content-type" content="text/html;charset=utf-8">
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<script>var oProc=new Array("四川省","湖南省","广东省");//随意选择三个省，如需更多，添加便是var oCity=new Array();//创建一个数组，用以存放市选择项oCity[0]=new Array("成都市","绵阳市","达州市");oCity[1]=new Array("长沙市","常德市","湘潭市");oCity[2]=new Array("广州市","深圳市","珠海市");var oDist=new Array();//创建一个数组，用于存放市级以下的各个区县oDist[0]=new Array();//这是必须声明的一项，否则会报异常oDist[1]=new Array();oDist[2]=new Array();oDist[0][0]=new Array("武侯区","锦江区","金牛区");oDist[0][1]=new Array("梓潼县","安县","罗江县");oDist[0][2]=new Array("达县","通川县","宣汉县");oDist[1][0]=new Array("长沙区","开福区","芙蓉区");oDist[1][1]=new Array("武陵区","鼎城区","汉寿县");oDist[1][2]=new Array("湘潭县","雨湖区","岳塘区");oDist[2][0]=new Array("白云区","天河区","黄埔区");oDist[2][1]=new Array("罗湖区","宝安区","福田区");oDist[2][2]=new Array("香洲区","金湾区","斗门区");//加载完成时，执行function showLoad(){var oproc=document.getElementById("proc");for(var i=0;i<oProc.length;i++){var oOpt=document.createElement("option");var oTxt=document.createTextNode(oProc[i]);oOpt.appendChild(oTxt);oproc.appendChild(oOpt);}}//当“proc”发生change事件时，执行function showCity(){var oproc=document.getElementById("proc");var ocity=document.getElementById("city");var odist=document.getElementById("dist");if(oproc.value=="-1"){//判断，当未选择时。将市级，区级中的内容清空ocity.options.length=1;odist.options.length=1;}else{ocity.options.length=1;odist.options.length=1;var num=oproc.options.selectedIndex;for(var i=0;i<oCity[num-1].length;i++){//循环加入数据var oOpt=document.createElement("option");var oTxt=document.createTextNode(oCity[num-1][i]);oOpt.appendChild(oTxt);ocity.appendChild(oOpt);}}}//当“city”发生change事件时，执行function showDist(){var oproc=document.getElementById("proc");var ocity=document.getElementById("city");var odist=document.getElementById("dist");if(ocity.value=="-1"){//判断，当未选择时。将区级中的内容清空odist.options.length=1;}else{odist.options.length=1;var numPro=oproc.options.selectedIndex;var numCity=ocity.options.selectedIndex;for(var i=0;i<oDist[numPro-1][numCity-1].length;i++){var oOpt=document.createElement("option");//创建一个option元素节点var oTxt=document.createTextNode(oDist[numPro-1][numCity-1][i]);//创建一个文本节点oOpt.appendChild(oTxt);//将文本节点加入到oOpt元素节点中odist.appendChild(oOpt);//将oOpt元素节点添加到odist中}}}
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<body onload="showLoad()"><!-- 页面加载完成时，初始化省选择项 -->
<div>请选择地区：<select id="proc" onchange="showCity()"><option value="-1">--请选择省--</option></select><select id="city" onchange="showDist()" ><option value="-1">--请选择市--</option></select><select id="dist"><option value="-1">--请选择区--</option></select>
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</html> 其实要真正做上一个‘’省市区级‘’的三级联动，所需的数据还多，只需向数组中添加数据就OK了。
