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1.什么是 JavaScript 事件循环（Event Loop）？宏任务和微任务执行顺序是怎样的？ JavaScript 是单线程的，同一时间只能执行一个任务。为了避免像定时器、网络请求、用户点击这些异步操作阻塞主线程，浏览器和 Node 运行时引入了 Event Loop，也就是事件循环机制。

展开运算符的作用就像是把一个压缩包“解压”，或者是把一个装满东西的盒子里的物品全部倒出来，铺在桌面上。 它是右值操作（通常出现在等号右边或函数参数里），用于展开元素。 它取出数组的所有元素，并将它们作为独立的值放入新环境中。 这是展开 ...

I've tested everything from TVs to phones, PCs, tablets and more. If you’re an assiduous notetaker, you know that it’s hard to put a price on a great writing tablet. The best writing tablets can help ...

We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Kimber Streams, Dave Gershgorn, and Haley Perry Our top Windows laptop pick is ...

Whether you want a simple budget PC, a productivity workhorse, or a screamer of a gaming notebook, our experts have done the heavy lifting to help you find the right laptop for the job. From the ...

Jot down your thoughts, save images of things you need to remember, and keep everything at your fingertips on all of your devices with the top note-taking apps we've tested. Justin has helped readers ...

Here at PCMag, we've tested thousands of laptops since our lab's founding more than 40 years ago. Our analysts and editors have more than a collective century of experience telling the good laptops ...