Async/await and its underlying use of promises are taking the JS world by storm. Now supported by a majority of client and server JS platforms, callback programming is becoming a thing of the past.

clearTimeout 中支持传入 id 删除定时器，而之前只支持传入定时器对象。一切看起来没问题，但是实现这个特性的时候，忘了一种场景，那就是如果用户没有执行 clearTimeout，而是定时器正常触发，因为在定时器正常触发的逻辑中没有删除映射关系，从而导致了内存 ...

The setTimeout() method in JavaScript sets a time interval during which the CPU wait to perform the task specified in it. It alter the time interval of the CPU to perform the tasks. The Syntax of the ...

setTimeout，它就是一个定时器，用来指定某个函数在多少毫秒之后执行。 setTimeout，它就是一个定时器，用来指定某个函数在多少毫秒之后执行。 第一个参数为函数或可执行的字符串(比如alert('test'),此法不建议使用) 第二个参数为延迟毫秒数，可选的，默认值为0 ...

Maybe it's standard terminology, I don't know, but it doesn't seem to me that the examples where setTimeOut calls itself are really recursive - it looks like the functions are "respawning" themselves ...

‘Higher-order functions’ is a fancy term for functions that take other functions as arguments or that return functions. Very powerful! Last week, I casually dropped the term “higher-order function” ...