ES6+对象常用方法

愉快的小跳蛙2024-04-02 10:30

1.往Object里面添加元素

javascript 复制代码

const obj = {
          timeArr: [],
          fileIds: [],
          isVerifyOrder: res?.isVerifyOrder ? "true" : "false",
          isCompose: res?.isCompose ? "true" : "false",
        };
        
        
  Object.assign(res, obj);//往res添加属性
  
   const obj = Object.assign({}, this.orderInfo, this.addressObj);
      obj.orderChannelType = 4; // 订单渠道
      obj.receivableMoney = String(this.actualMoney); // 应收金额
      obj.invoiceId = this.invoiceInfo?.id; // 关联发票

2.排除Object中不需要的键值

javascript 复制代码

const obj = {
    a:1,
    b:2,
    c:3,
    d:4
}

// 我们想要获取除了a之外的所有属性
const {a, ...other} = obj

3.对象快速求和

javascript 复制代码

const objs = [
{name:'lilei', score: 98},
{name:'hanmeimei', score: 95},
{name:'polo', score: 85},
...
]

const scoreTotal = objs.reduce( (total, obj) => {
    return obj.score + total;
}, 0 /*第二个参数是total的初始值*/)

4.利用Object.assign初始化数据

javascript 复制代码

//初始化所有data数据
Object.assign(this.$data, this.$options.data());

//初始化choiceList这个数据
Object.assign(this.$data.choiceList, this.$options.data());