使用了element ui。看文档可以用$on与$emit模拟双向绑定。但是似乎失败了。。两天了没解决，心好累。。

1. 组件代码

   
        
            
            
        
    

methods: {
    testChange(val){
                this.$emit('testChange',val);
            }
}
   

2.父级代码

 

import vueAddress from 'src/components/address'

components: {
        vueAddress
      },
data: function() {
        return {
            provinceValue:'全国',
            cityValue:''
        }
      },
methods: {
    testChange2(val){
            this.provinceValue=val;
       }
   }

最后在父级点击组件依旧是

[Vue warn]: Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders. Instead, use a data or computed property based on the prop's value. Prop being mutated: "provinceValue"