<!DOCTYPE html><html>?<head>??<meta charset="UTF-8">??<title>聯動</title>???</head>?<body>??<select id="city">???<option value="bj">北京</option>???<option value="sx">山西</option>???<option value="tj">天津</option>???<option value="hb">河北</option>??</select>??<select id="area">???<option >朝陽</option>???<option >海淀</option>???<option >昌平</option>;??</select>???</body>??<script type="text/javascript">??var select = document.getElementById("city");??select.onchange = function(){???var optionVal = select.value;???switch(optionVal){????case 'bj':?????var area = document.getElementById("area");?????area.innerHTML ="<option >朝陽</option><option >海淀</option><option >昌平</option>";?????break;????case 'tj':?????var area = document.getElementById("area");?????area.innerHTML ="<option >浦東</option><option >浦西</option><option >楊浦</option>";?????break;????case 'sx';?????var area = document.getElementById("area");?????area.innerHTML ="<option >忻州</option><option >朔州</option><option >太原</option>";?????break;????case 'hb';?????var area = document.getElementById("area");?????area.innerHTML ="<option >衡水</option><option >保定</option><option >青皇島</option>";?????break;?????default:?????alert("error");???}??};?</script>?</html>
html中的二級聯動問題，代碼已經獻上！聯動不了，求大神給看看
慕粉3922300
2017-05-06 11:27:52
