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feat: update answer
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Answer/1 ~ 10/4.md
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Answer/1 ~ 10/4.md
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页面上有三个按钮,分别为 A、B、C,点击各个按钮都会发送异步请求且互不影响,每次请求回来的数据都为按钮的名字。
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请实现当用户依次点击 A、B、C、A、C、B 的时候,最终获取的数据为 ABCACB。
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这道题目主要两个考点:
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1. 请求不能阻塞,但是输出可以阻塞。比如说 B 请求需要耗时 3 秒,其他请求耗时 1 秒,那么当用户点击 BAC 时,三个请求都应该发起,但是因为 B 请求回来的慢,所以得等着输出结果。
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2. 如何实现一个队列?
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其实我们无需自己去构建一个队列,直接利用 `promise.then` 方法就能实现队列的效果了。
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答案摘自 [pandaomeng(https://github.com/KieSun/fucking-frontend/issues/5#issuecomment-796657041)
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```js
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class Queue {
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promise = Promise.resolve();
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excute(promise) {
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this.promise = this.promise.then(() => promise);
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return this.promise;
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}
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}
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const queue = new Queue();
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const delay = (params) => {
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const time = Math.floor(Math.random() * 5);
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return new Promise((resolve) => {
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setTimeout(() => {
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resolve(params);
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}, time * 500);
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});
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};
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const handleClick = async (name) => {
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const res = await queue.excute(delay(name));
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console.log(res);
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};
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handleClick('A');
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handleClick('B');
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handleClick('C');
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handleClick('A');
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handleClick('C');
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handleClick('B');
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```
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