在实现省市二级联动时，如果省份和城市写在一个数组对象中。可以根据，点击某个省份时获取到目标省份的id 是否同 数组中的某个对象id一致 来判断
iView中的on-change事件
on-change事件：即选中的Option变化时触发，默认返回 value。（value在这里只支持String和Number类型）
1、html部分
<template>
<Form ref="formValidate" :model="formValidate" :rules="ruleValidate">
<FormItem prop="province" label="省份">
<Select v-model="formValidate.province" placeholder="请选择城市" @on-change="change">
<Option v-for="item in provinceArr" :key="item.id" :value="item.id" >{{ item.name}}</Option>
</Select>
</FormItem>
<FormItem prop="city" label="城市">
<Select v-model="formValidate.city" placeholder="请选择省份">
<Option v-for="item in cities" :key="item.id" :value="item.id" >{{ item.name}}</Option>
</Select>
</FormItem>
</Form>
</template>
2、JS主要部分
<script>
export default{
data(){
return {
provinceArr: [
{
id:1,
name:"北京市",
cities:[{id:11,
name:"北京市"}]
},
{
id:2,
name:"天津市",
cities:[{id:12,
name:"天津市"} ]
},
{
id:3,
name:"上海市",
cities:[ {id:13,
name:"上海市"} ]
}
],
cities: "",
formValidate:...,
ruleValidate:...
}
},
methods:{
change(val){
for(var i=0; i<this.provinceArr.length; i++){
if(val == this.provinceArr[i].id ){
this.cities = this.provinceArr[i].cities;
}
}
}
}
}
</script>
