在创建计时器之前，您不能直接传递计时器的 ID。问题是你必须调用 setInterval才能获取 ID，然后才能将其实际传递给被调用的函数：let timerId = setInterval(function() {}, 1000, timerId);
//error - we are using `timerId` before its declaration is finished传递一个对象但是，您可以利用对象在共享相同引用的情况下工作的方式。因此，您可以初始化一个对象，这意味着该变量存在，然后调用setInterval并将计时器ID记录为该对象的属性。然后将该对象作为参数传递给回调。当回调执行时，对象属性肯定会被填充，您可以只使用其中的值：let cb;{ //callback in one scope //simple counter that stops at zero let i = 3; cb = timerContext => { console.log(i--); if (i < 0) { console.log("finish"); clearInterval(timerContext.timerId); } }}{//start the timer in a different scope let context = { timerId: null }; context.timerId = setInterval(cb, 1000, context);}创建一个包装器或者，如果您在调用 setInterval 时为其创建包装函数，则只能向外部回调传递计时器 ID：let cb;{ //callback in one scope //simple counter that stops at zero let i = 3; cb = timerId => { console.log(i--); if (i < 0) { console.log("finish"); clearInterval(timerId); } }}{//start the timer in a different scope let timerId = setInterval(() => cb(timerId), 1000);}传递为thisthis如果您愿意，如果您的回调是普通函数，则可以以任一方式将计时器 ID 作为上下文传递：目的let cb;{ //callback in one scope //simple counter that stops at zero let i = 3; cb = function() { console.log(i--); if (i < 0) { console.log("finish"); clearInterval(this.timerId); } }}{//start the timer in a different scope let context = { timerId: null }; context.timerId = setInterval(cb.bind(context), 1000);}只要身份证号let cb;{ //callback in one scope //simple counter that stops at zero let i = 3; cb = function() { console.log(i--); if (i < 0) { console.log("finish"); clearInterval(this); } }}{//start the timer in a different scope let timerId = setInterval(() => cb.call(timerId), 1000);}