ES6对象数组的解构

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es6对象与数组的解耦及常用属性

参考链接

        //对象解构
        let myinfo = {name: 'zxj', age: 12, child: {firstChild: '小明'}};
        let {name, age, child: {firstChild: xiaoming} = myinfo;

        // 数组解构
        let arr = [1, 2, 3, 4, 5, {person: {name: 'juan', age: 12}}];
        let [num1, num2, ...num3] = arr;
        let [, , , , , ...num4] = arr;

        // 复杂的结结构
        let [,,,,,{person:num5}] = arr; //num5 => person对象
        let [,,,,,{person:{name:num6}}] = arr;//num6 => juan

        let [,,,,,,num7] = arr;//undefined
        [,,,,,,num7=true] = arr;//true

        let {length} = arr;//6

        // 复制
        let [...arr2] = arr;  //es6
        let arr3 = arr.concat();
        let arr4 = JSON.parse(JSON.stringify(arr));
        
        //冒泡排序时用于交换ab的值
        let a = 1, b = 2;
        [a, b] = [b, a];