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Full code display of three-level linkage in JavaScript development

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>三级联动</title>
    <style>
 *{margin:0;padding:0;}
    </style>
</head>
<body>
<div>
 请选择地区:
    <select name="" id="proc" onchange="showCity()">
        <option value="">--请选择省--</option>
    </select>
    <select name="" id="city" onchange="showDist()">
        <option value="">--请选择市--</option>
    </select>
    <select name="" id="dist">
        <option value="">--请选择区--</option>
    </select>
</div>
<script type="text/javascript" src=""></script>
<script>
 //声明省
 var oProc = ["安徽","上海","山东"];  //直接声明array
    //声明市
 var oCity = [
        ["合肥","淮南","芜湖"],
 ["浦东","闵行","浦西"],
 ["济南","青岛","枣庄"]
    ];
 //声明区
 var oDist = [
        [
            ["政务区","庐阳区","蜀山区"],
 ["田家庵区","大通区","九龙岗区"],
 ["镜湖区","鸠江区","三山区"]
        ],
 [
            ["浦东1","浦东2","浦东3"],
 ["闵行1","闵行2","闵行3"],
 ["浦西1","浦西","浦西3"]
        ],
 [
            ["历下区","天桥区","长清区"],
 ["市南区","市北区","李沧区"],
 ["薛城区","市中区","峄城区"]
        ]
    ];
 var oproc = document.getElementById("proc");
 var ocity = document.getElementById("city");
 var odist = document.getElementById("dist");
 window.onload = function(){
        for(var i =0;i<oProc.length;i++){
            //创建元素节点
 var oOpt = document.createElement("option");
 //创建文本节点
 var oTxt = document.createTextNode(oProc[i]);
 oOpt.appendChild(oTxt);
 oproc.appendChild(oOpt);
 }
    };
 function showCity(){
        if(oproc.value=="-1"){
            ocity.options.length = 1;
 odist.options.length = 1;
 }else{
            ocity.options.length = 1;
 odist.options.length = 1;
 var num = oproc.options.selectedIndex;
 //console.log(num);
 for(var i =0;i<oCity[num-1].length;i++){
                var oOpt = document.createElement("option");
 var oTxt = document.createTextNode(oCity[num-1][i]);
 oOpt.appendChild(oTxt);
 ocity.appendChild(oOpt);
 }
        }
    }
    function showDist(){
        if(ocity.value=='-1'){
            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");
 var oTxt = document.createTextNode(oDist[numPro-1][numCity-1][i]);
 oOpt.appendChild(oTxt);
 odist.appendChild(oOpt);
 }
        }
    }
</script>
</body>
</html>


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