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所有代码和教程开源在 github: github.com/WTFAcademy/WTF-JavaScript
JavaScript 是单线程的编程语言,浏览器按照我们代码的顺序一行一行地执行程序。如果执行到一个耗时很长的任务,后面的任务就会被阻塞,拖延整个程序的执行。异步编程技术允许我们执行一个长时间任务时,程序不需要进行等待,而是继续执行后面的代码 ...
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