const list = [1, 2, 3]
const square = num => {
return new Promise((resolve, reject) => {
setTimeout(() => {
resolve(num * num)
}, 1000)
})
}
//迭代器实现
async function test () {
var iter = list[Symbol.iterator]();
var flag = iter.next();
while (!flag.done) {
await square(flag.value).then(res => console.log(res));
flag = iter.next();
}
}
test();
const list = [1, 2, 3] const square = num => { return new Promise((resolve, reject) => { setTimeout(() => { resolve(num * num) }, 1000) }) } //迭代器实现 async function test () { var iter = list[Symbol.iterator](); var flag = iter.next(); while (!flag.done) { await square(flag.value).then(res => console.log(res)); flag = iter.next(); } } test();第 160 题：输出以下代码运行结果，为什么？如果希望每隔 1s 输出一个结果，应该如何改造？注意不可改动 square 方法