setTimeout(callback[, delay[, ...args]])

• callback <Function> 当定时器结束时调用的函数。

  ¥callback <Function> The function to call when the timer elapses.

• delay <number> 调用 callback 之前等待的毫秒数。默认值：1。

  ¥delay <number> The number of milliseconds to wait before calling the callback. Default: 1.

• ...args <any> 调用 callback 时要传入的可选参数。

  ¥...args <any> Optional arguments to pass when the callback is called.

• 返回：<Timeout> 与 clearTimeout() 配合使用

  ¥Returns: <Timeout> for use with clearTimeout()

在 delay 毫秒后调度单次的 callback 的执行。

¥Schedules execution of a one-time callback after delay milliseconds.

callback 可能不会在精确的 delay 毫秒内被调用。Node.js 不保证回调将触发的确切时间，也不保证它们的顺序。回调将在尽可能接近指定的时间时调用。

¥The callback will likely not be invoked in precisely delay milliseconds. Node.js makes no guarantees about the exact timing of when callbacks will fire, nor of their ordering. The callback will be called as close as possible to the time specified.

当 delay 大于 2147483647 或小于 1 或 NaN 时，delay 将设置为 1。非整数延迟被截断为整数。

¥When delay is larger than 2147483647 or less than 1 or NaN, the delay will be set to 1. Non-integer delays are truncated to an integer.

如果 callback 不是函数，则将抛出 TypeError。

¥If callback is not a function, a TypeError will be thrown.

此方法具有可使用 timersPromises.setTimeout() 获得的 promise 的自定义变体。

¥This method has a custom variant for promises that is available using timersPromises.setTimeout().