abstract：<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>ajax实现三级级联动</t
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>ajax实现三级级联动</title>
</head>
<body>
省：<select name="" id="pro"></select>
市：<select name="" id="city"></select>
区县：<select name="" id="area"></select>
<!--<p><span id="addr1"></span ><span id="addr2"></span><span id="addr3"></span></p>-->
<p id="addr"></p>
<script src="lib/jquery-3.3.1.min.js"></script>
<script>
$(function () {
$.getJSON('inc/1.json',function(data) {
// console.log(data);
let option='<option value="">选择(省)</option>';
$.each(data,function (i) {
option+='<option value="'+data[i].proId+'">'+data[i].proName+'</option>'
});
// console.log(option);
$('#pro').html(option);
});
$('#pro').change(function () {
console.log($(this).find(':selected').text());//查看当前选择的省的名称
// $('#addr1').html($(this).find(':selected').text());
$('#addr').html($(this).find(':selected').text());
$.getJSON('inc/2.json',function(data){
// console.log(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>'
}});
// console.log(option);
$('#city').html(option);
});
});
$('#city').change(function () {
console.log($(this).find(':selected').text());//查看当前选择的市的名称
// $('#addr2').html($(this).find(':selected').text());
$('#addr').html($('#pro').find(':selected').text()+$(this).find(':selected').text());
$.getJSON('inc/3.json',function(data){
// console.log(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>'
}
});
// console.log(option);
$('#area').html(option);
});
})
$('#area').change(function () {
console.log($(this).find(':selected').text());//查看当前选择的县区的名称
// $('#addr3').html($(this).find(':selected').text());
$('#addr').html($('#pro').find(':selected').text()+$('#city').find(':selected').text()+$(this).find(':selected').text());
});
})
</script>
</body>
</html>[
{
"proId":1,
"proName":"安徽"
},
{
"proId":2,
"proName":"江苏"
}
][
{
"cityId":1,
"cityName":"合肥",
"proId":1
},
{
"cityId":2,
"cityName":"芜湖",
"proId":1
},
{
"cityId":3,
"cityName":"南京",
"proId":2
},
{
"cityId":4,
"cityName":"苏州",
"proId":2
}
][
{
"areaId":1,
"areaName":"包河区",
"cityId":1
},
{
"areaId":2,
"areaName":"蜀山区",
"cityId":1
},
{
"areaId":1,
"areaName":"玄武区",
"cityId":3
},
{
"areaId":2,
"areaName":"昆山市",
"cityId":3
},
{
"areaId":1,
"areaName":"镜湖区",
"cityId":2
},
{
"areaId":2,
"areaName":"弋江区",
"cityId":2
},
{
"areaId":1,
"areaName":"虎丘区",
"cityId":4
},
{
"areaId":2,
"areaName":"吴中区",
"cityId":4
}
]ajax实现三级联动实现比在html里直接写方便多了，只要修改三个JSON文件就可以，传输方式用的是$.getJSON(),里面是地址和函数，实现页面实时显示我想了2种方法，1.是在html中加入3个span标签，写3个分别进行地址的输出，2.是在ajax代码中使用+连接符进行连接输出 
Correcting teacher：韦小宝Correction time：2018-12-26 09:55:46
Teacher's summary：不错不错！写的很棒！也很有想法！课后记得多练习哦！