abstract：<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>三级联动菜单</title>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>三级联动菜单</title>
</head>
<body>
省 <select name="" id="pro"></select>
市 <select name="" id="city"></select>
区 <select name="" id="area"></select>
<p id="addr"></p>
<script src="../lib/jquery.js"></script>
<script>
$(function(){
$.getJSON('inc/1.json',function(data){
let option = '<option value="">选择(省)</option>';
$.each(data,function(i){
option += '<option value="'+data[i].proId+'">'+data[i].proName+'</option>';
});
$('#pro').html(option);
});
$('#pro').change(function(){
console.log($(this).find(':selected').text());
$.getJSON('inc/2.json',function(data){
let option = '<option value="">选择(市)</option>';
$.each(data,function(i){
if (data[i].proId == $('#pro').val()) {
option += '<option value="'+data[i].cityId+'">'+data[i].cityName+'</option>';
}
});
$('#city').html(option);
});
});
$('#city').change(function(){
console.log($(this).find(':selected').text());
$.getJSON('inc/3.json',function(data){
let option = '<option value="">选择(县区)</option>';
$.each(data,function(i){
if (data[i].cityId == $('#city').val()) {
option += '<option value="'+data[i].areaId+'">'+data[i].areaName+'</option>';
}
});
$('#area').html(option);
});
});
$('#area').change(function(){
console.log($(this).find(':selected').text());
});
})
</script>
</body>
</html>
Correcting teacher：天蓬老师Correction time：2019-04-13 16:48:43
Teacher's summary：三级联动, 现在有很多优秀的第三方插件来实现, 实际工作中, 让你手写的机会几乎没有, 但了解实现的原理,还是很有好处的, 不是吗?
