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javascript使用Array陣列實現省市區三級聯動

效果圖:

這裡寫圖片描述

HTML程式碼:

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title></title>
    <script src="js/test.js"></script>
</head>
<body>

省:
<select style="width: 100px;" id="pre" onchange="chg(this);">
    <option value="-1"
>
請選擇</option> </select> 市: <select style="width: 100px;" id="city" onchange="chg2(this)"></select> 區: <select style="width: 100px;" id="area"></select> <script src="js/test.js"></script> </body> </html>

JavaScript程式碼:

//宣告省
var pres = ["北京", "上海"
, "山東"]; //直接宣告Array //宣告市 var cities = [ ["東城", "昌平", "海淀"], ["浦東", "高區"], ["濟南", "青島"] ]; //宣告區 var areas = [ [ ["東城1", "東城2", "東城3"], ["昌平1", "昌平2", "昌平3"], ["海淀1", "海淀2", "海淀3"] ], [ ["浦東1", "浦東2", "浦東3"], ["高區1", "高區2", "高區3"] ], [ ["濟南1"
, "濟南2"], ["青島1", "青島2"] ] ]; //設定一個省的公共下標 var pIndex = -1; var preEle = document.getElementById("pre"); var cityEle = document.getElementById("city"); var areaEle = document.getElementById("area"); //先設定省的值 for (var i = 0; i < pres.length; i++) { //宣告option.<option value="pres[i]">Pres[i]</option> var op = new Option(pres[i], i); //新增 preEle.options.add(op); } function chg(obj) { if (obj.value == -1) { cityEle.options.length = 0; areaEle.options.length = 0; } //獲取值 var val = obj.value; pIndex = obj.value; //獲取ctiry var cs = cities[val]; //獲取預設區 var as = areas[val][0]; //先清空市 cityEle.options.length = 0; areaEle.options.length = 0; for (var i = 0; i < cs.length; i++) { var op = new Option(cs[i], i); cityEle.options.add(op); } for (var i = 0; i < as.length; i++) { var op = new Option(as[i], i); areaEle.options.add(op); } } function chg2(obj) { var val = obj.selectedIndex; var as = areas[pIndex][val]; areaEle.options.length = 0; for (var i = 0; i < as.length; i++) { var op = new Option(as[i], i); areaEle.options.add(op); } }