效果图：
代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="GBK">
<title></title>
<style>
</style>
</head>
<body>
<div id="app" >
<select v-model='prov' @change="changeCity();changeCity1()">
<option v-for="(item,i) in items">{{item.name}}</option>
</select>
-- <select v-model='city' @change="changeCity1">
<option v-for="(item,i) in cityArr">{{item.name}}</option>
</select>
-- <select v-model='city1'>
<option v-for="(item,i) in cityArr1">{{item.name}}</option>
</select>
<p>您选中的是：{{prov}}-{{city}}-{{city1}}</p>
</div>
</body>
<script src="vue.js"></script>
<script>
var id=1;
new Vue({
el:'#app',
data:{
prov:'北京',
city:'',
city1:'',
items:[
{name:'北京',
sub:[
{name:'北京市',sub:[{name:'北京市11'},{name:'北京市12'},{name:'北京市13'}]},
{name:'北京市2',sub:[{name:'北京市21'},{name:'北京市22'},{name:'北京市23'}]},
]
},
{name:'江西',
sub:[
{name:'南昌市',sub:[{name:'高新区'},{name:'西湖区'},{name:'瑶湖区'}]},
{name:'赣州市',sub:[{name:'赣州市1'},{name:'赣州市2'},{name:'赣州市3'}]},
{name:'抚州市',sub:[{name:'抚州市1'},{name:'抚州市2'},{name:'抚州市3'}]}
]
}
],
cityArr:[],
cityArr1:[]
},
mounted:function(){//执行默认选择
this.changeCity();
this.changeCity1();
},
methods:{
changeCity:function(){//省切换
var me=this;
var item ;
me.items.forEach(function(ele){
if(ele.name===me.prov){//判断与prov是否相等，相等的表示被切换选中的省份
item = ele;
}
})
if(item){
this.cityArr=item.sub;//将选中的item的sub设置给cityArr 用于显示市
this.city=item.sub[0].name;//默认选择第一个市
this.cityArr1=[];
this.city1='';
}
},
changeCity1:function(){//市切换
var me=this;
var item ;
me.cityArr.forEach(function(ele){
if(ele.name===me.city){//判断与city是否相等，相等的表示被切换选中的市
item = ele;
}
})
if(item){
this.cityArr1=item.sub;//将选中的item的sub设置给cityArr1 用于显示区
this.city1=item.sub[0].name;//默认选择第一个区
}
}
}
})
</script>
</html>
