Java script (ES6） 解构赋值用法

解构赋值有时挺好用的，使代码更简洁。比如有如下需求：

一个Entity会有多个字段，但是通过ajax提交给后端时，只想更新这个Entity对应的表记录的某些字段，那就可以用解构的写法。

//update category, other than the specified fields, all other will remain the same
//as before
update() {
      var {catId,name,icon,productUnit} = this.category;
      this.$http({
        url: this.$http.adornUrl("/product/category/update"),
        method: "post",
//when use {} to construct a object, the field name and the value variable name is same, we //can only use the value variable.
        data: this.$http.adornData({catId,name,icon,productUnit}, false),
       //这里then函数参数也有用到解构，将本来传传进来的对象，转化成对象里边名字时data的属性
      }).then(({ data }) => {
        this.dialogVisible = false;
        this.$message({
          message: "Congrats, category is successfully updated.",
          type: "success",
        });
        this.getMenus();
        this.defaultExpandedKeys = [this.category.parentCid];
      });
    }