elementUI的cascader级联选择控件的默认值(回显)问题

其实所谓回显，也只是默认值的问题。例如，一个省市联动，如果当一个用户修改自己信息的时候，那么他能看到级联选择的值，也就是说
在修改页面我们给级联选择器赋值一个默认值就可以了。截图是官方文档
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下面是我的部分代码
html:

js：

 selectedoptions:[],
 $.ajax({
               type:"get",
               url:this.api.userdata+"?id="+result,
               datetype:"json",
               contenttype : 'application/json',
               success:function(result){
                    app.user=result.data;
                    app.selectedoptions=json.parse(result.data.useraddress);
               },
               error:function(result){
               }
           });

运行结果：

ps：以后写代码还是要多思考，虽然有些功能能实现，但是要在功能实现过后想一想是否更简单的做法。