javascript - 重复 setTimeout

Question

我试图setTimeout每 10 秒重复一次。我知道setTimeout默认情况下只等待然后执行一次操作。我怎样才能重复这个过程？

setTimeout(function() {
  setTimeout(function() {
    console.log("10 seconds");
  }, 10000);
}, 10000);

Answer 1

也许你应该使用setInterval()

Answer 2

setInterval()可能是您正在寻找的东西，但是如果您想通过以下方式获得相同的效果setTimeout()：

function doSomething() {
    console.log("10 seconds");
    setTimeout(doSomething, 10000);
}

setTimeout(doSomething, 10000);

或者，如果您不想声明单独的函数并想坚持使用函数表达式，则需要将其设为命名函数表达式：

setTimeout(function doSomething() {
    console.log("10 seconds");
    setTimeout(doSomething, 10000);
}, 10000);

（或者如果您不介意使用已弃用的语言功能，请使用arguments.callee 。）

Answer 3

根据我的说法， setInterval() 是您情况下的最佳方法。
这是一些代码：

 setInterval(function() {

//your code

}, 10000); 
// you can change your delay by changing this value "10000".

Answer 4

Unlike the answers provided by @nnnnnn and @uzyn I discourage you from making use of setInterval for reasons elaborated in the following answer. Instead make use of the following Delta Timing script:

function DeltaTimer(render, interval) {
    var timeout;
    var lastTime;

    this.start = start;
    this.stop = stop;

    function start() {
        timeout = setTimeout(loop, 0);
        lastTime = + new Date;
        return lastTime;
    }

    function stop() {
        clearTimeout(timeout);
        return lastTime;
    }

    function loop() {
        var thisTime = + new Date;
        var deltaTime = thisTime - lastTime;
        var delay = Math.max(interval - deltaTime, 0);
        timeout = setTimeout(loop, delay);
        lastTime = thisTime + delay;
        render(thisTime);
    }
}

The above script runs the given render function as close as possible to the specified interval, and to answer your question it makes use of setTimeout to repeat a process. In your case you may do something as follows:

var timer = new DeltaTimer(function (time) {
    console.log("10 seconds");
}, 10000);

var start = timer.start();

Answer 5

const myFunction = () => {
        setTimeout(() => {
            document.getElementById('demo').innerHTML = Date();
            myFunction();
        }, 10000);
    }

最简单但效率不高的方法！

Answer 6

这是一个使用 setTimeout 的函数，它试图调用自己尽可能接近定期间隔。如果你观察输出，你可以看到时间漂移和被重置。

<script type="text/javascript">

function Timer(fn, interval) {
  this.fn = fn;
  this.interval = interval;
}

Timer.prototype.run = function() {

    var timer = this;
    var timeDiff = this.interval;
    var now = new Date();  // Date.now is not supported by IE 8
    var newInterval;

    // Only run if all is good
    if (typeof timer.interval != 'undefined' && timer.fn) {

      // Don't do this on the first run
      if (timer.lastTime) {
        timeDiff = now - timer.lastTime;
      }
      timer.lastTime = now;

      // Adjust the interval
      newInterval = 2 * timer.interval - timeDiff;

      // Do it
      timer.fn();

      // Call function again, setting its this correctly
      timer.timeout = setTimeout(function(){timer.run()}, newInterval);
  }
}


var t = new Timer(function() {
  var d = new Date();
  document.getElementById('msg').innerHTML = d + ' : ' + d.getMilliseconds();
}, 1000);


window.onload = function() {
  t.run();
};
</script>

<span id="msg"></span>

Answer 7

使用 jQuery，您可以执行以下操作：

function updatePage() {

var interval = setTimeout(updatePage, 10000); // 10' Seconds

    $('a[href]').click(function() {
      $(this).data('clicked', true);
      clearInterval(interval); // Clears Upon Clicking any href Link
      console.log('Interval Cleared!');
    });
   // REPLACE 'YOUR_FUNCTION_NAME' function you would like to execute
    setTimeout(YOUR_FUNCTION_NAME, 500);

} // Function updatePage close syntax

updatePage(); // call the function again.