//声明一个对象
const banji = {
    name: "五班",
    stus: [
        "张三",
        "李四",
        "王五",
        "小六"
    ],
    [Symbol.iterator]() {
        //索引变量
        let index = 0;
        let _this = this;
        return {
            next: function () {
                if (index < _this.stus.length) {
                    const result = {value: _this.stus[index], done: false};
                    //下标自增
                    index++;
                    //返回结果
                    return result;
                } else {
                    return {value: undefined, done: true};
                }
            }
        };
    }
}

//遍历这个对象
for (let v of banji) {
    console.log(v);
}