el-cascader----------element联级菜单回显

 
//映射后台的字段显示
    

ruleForm:[],
          options: [{
          value: 'zhinan',
          label: '指南',
            children: [{
              value: 'shejiyuanze',
              label: '设计原则',
              children: [{
                value: 'yizhi',
                label: '一致'
              }, {
                value: 'fankui',
                label: '反馈'
              } , {
                value: 'kekong',
                label: '可控'
              }]
            } ]
          }],

回显设置数据
        this.ruleForm = ['zhinan','shejiyuanze','yizhi']