這次帶給大家JS實作下拉框連動步驟詳解，JS實作下拉框連動的注意事項有哪些，下面就是實戰案例，一起來看一下。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title> JS下拉联动</title>
<script>
function setSecond(obj){
var val = obj.value;
if(val == 'en'){
var sec = document.getElementById('second');
sec.innerHTML = "<option>one</option><option>two</option>";
}else{
var sec = document.getElementById('second');
sec.innerHTML = "<option>一</option><option>二</option>";
}
}
</script>
</head>
<body>
<p>
<select id="first" onchange="setSecond(this)">
<option value="en">en</option>
<option value="zh">zh</option>
</select>
</p>
<p>
<select id="second">
</select>
</p>
</body>
</html>使用innerHTML，IE瀏覽器不支援這種方法的，所以改進方法：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>JS下拉联动</title>
<script>
function setSecond(obj){
var val = obj.value;
if(val == 'en'){
var sec = document.getElementById('second');
sec.options[0] = new Option("one","one");
sec.options[1] = new Option("two","two");
}else{
var sec = document.getElementById('second');
sec.options[0] = new Option("一","one");
sec.options[1] = new Option("二","two");//可设置循环配置，也可一个一个配置
}
}
</script>
</head>
<body>
<p>
<select id="first" onchange="setSecond(this)">
<option value="en">en</option>
<option value="zh">zh</option>
</select>
</p>
<p>
<select id="second">
</select>
</p>
</body>
</html>可以相容火狐，IE等
相信看了本文案例你已經掌握了方法，更多精彩請關注php中文網其它相關文章！
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