js实现三级联动效果（简单易懂）
(编辑：jimmy 日期: 2025/9/23 浏览：3 次 )
话不多说，请看代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<select id="one">
<option>请输入省份</option>
</select>
<select id="two">
<option>请输入市</option>
</select>
<select id="three">
<option>请输入区</option>
</select>
<script type="text/javascript">
var oone=document.getElementById("one");
var otwo=document.getElementById("two");
var three=document.getElementById("three");
var str='';
otwo.disabled=true;
three.disabled=true;
var arr1=[{"id":"1","value":"北京"},{"id":"2","value":"上海"},{"id":"3","value":"重庆"},{"id":"4","value":"天津"},{"id":"5","value":"山东"}];
for(var i=0;i<arr1.length;i++){
str+="<option value="+arr1[i].id+">"+arr1[i].value+"</option>"
}
oone.innerHTML=str;
var arr2 = {
'1':['101@北京'],
'2':['201@上海'],
'3':['301@重庆'],
'4':['401@天津'],
'5':['501@济南','502@青岛'] };
oone.onchange=function(){
var val=this.value;
var arrA = arr2[val];
var str1='<option>请输入市</option>';
for(var j=0;j<arrA.length;j++){
var aaa=arrA[j].split('@');
str1+="<option value="+aaa[0]+">"+aaa[1]+"</option>"
}
otwo.innerHTML=str1;
otwo.disabled=false;
three.innerHTML='<option>请输入区</option>';
three.disabled='disabled';
}
var arr3 = {
'101':['朝阳区','昌平区'],
'201':['宝山区','浦东区'],
'301':['不知道'],
'401':['真的不知道'],
'501':['市中区','历下区','槐荫区'],
'502':['市南区','市北区','崂山区'] };
otwo.onchange = function(){
var val=this.value;
console.log( this.value);
var str2='<option>请输入区</option>';
console.log(val)
for(var l=0;l<arr3[val].length;l++){
str2+="<option >"+arr3[val][l]+"</option>"
}
three.innerHTML=str2;
three.disabled=false;
}
</script>
</body>
</html>
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