js-设计模式-实现迭代器模式

// es6 模式 内置
        function* myIterator() {
            yield 1;
            yield 2;
            yield 3;
        }
        for (const iterator of myIterator()) {
            console.log(iterator);
        }
        // es5 手动
        function myIterator5() {}
        myIterator5[Symbol.iterator] = () => {
            let index = 1;
            return {
                next() {
                    if (index > 3) {
                        return {
                            done: true
                        }
                    } else {
                        return {
                            value: index++,
                            done: false
                        }
                    }
                }
            }
        }
        for (const iterator of myIterator5) {
            console.log(iterator);
        }