AJAX实现省市县三级联动效果（jquery省市二级联动）难以置信

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<!DOCTYPE html>
<html>
<head>
<meta charset=”utf-8″>
<title></title>
<script src=”https://www.jb51.net/article/jquery-3.4.1.js” type=”text/javascript” charset=”utf-8″></script>
<script type=”text/javascript”>
$(function($){
function queryData(obj,callback){
// $.ajax({
// type:’get’,
// url:’http://localhost/AJAX/select.php’,
// data:obj,
// dataType:’json’,
// success:function(data){

// callback(data);
// }
// });
$.get(‘http://localhost/AJAX/select.php’,obj,function(data){
callback(data);
},’json’);
};
queryData({
flag:1
},function(data){
var option=”;
$.each(data,function(i,e){
option +='<option value=”‘ + e.id + ‘”>’ + e.province +'</option>’
});
$(‘#province’).append(option);
});
$(‘#province’).change(function(){
// 避免数据叠加
$(‘#city’).find(‘option:gt(0)’).remove();
queryData({
flag:2,
pId:$(this).val()
},function(data){
var option=”;
$.each(data,function(i,e){
option +='<option value=”‘ + e.id + ‘”>’ + e.city +'</option>’
});
$(‘#city’).append(option);
});
});
$(‘#city’).change(function(){
$(‘#county’).find(‘option:gt(0)’).remove();
queryData({
flag:3,
cId:$(this).val()
},function(data){
var option=”;
$.each(data,function(i,e){
option +='<option value=”‘ + e.id + ‘”>’ + e.county +'</option>’
});
$(‘#county’).append(option);
});
});
});
</script>
<style type=”text/css”>
#container{
width: 500px;
min-height: 300px;
margin: auto;
text-align: center;
padding: 10px;

}
</style>
</head>
<body>
<div id=”container”>
<label>
省:
<select id=”province”>
<option >请选择省…</option>
</select>
</label>
<label>
市:
<select id=”city”>
<option >请选择市…</option>
</select>
</label>
<label>
县:
<select id=”county”>
<option >请选择县…</option>
</select>
</label>
</div>
</body>
</html>