javascript 如何每隔几秒执行一次操作？
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How to perform an action every couple of seconds?
提问by Iladarsda
Can someone quickly and simply explain to me how to perform an action every couple of seconds using
有人可以快速简单地向我解释如何使用
var timeOut = setTimeout(FunctionName, 5000);
I want to run a function every 5 seconds.
我想每 5 秒运行一次函数。
回答by James Allardice
As you asked for a method using setTimeout:
当您要求使用setTimeout以下方法时：
function doStuff() {
console.log("hello!");
setTimeout(doStuff, 5000);
}
setTimeout(doStuff, 5000);
But it would probably be better to use setInterval:
但最好使用setInterval：
function doStuff() {
console.log("hello!");
}
setInterval(doStuff, 5000);
回答by miku
Just put setTimeoutat the end inside your function, with a call to itself - like a delayed tail-recursion.
只需将setTimeout其放在函数的末尾，并调用自身 - 就像延迟尾递归一样。
回答by vaidas
In the example below, when a button is clicked, the input field will start to count (for ever), starting at 0.
在下面的示例中，当单击按钮时，输入字段将开始计数（永远），从 0 开始。
<html>
<head>
<script type="text/javascript">
var c = 0;
var t;
var timer_is_on = false;
function timedCount() {
document.getElementById('txt').value = c;
c = c + 1;
t = setTimeout(timedCount, 1000);
}
function doTimer() {
if (!timer_is_on) {
timer_is_on = true;
timedCount();
}
}
</script>
</head>
<body>
<form>
<input type="button" value="Start count!" onclick="doTimer()">
<input type="text" id="txt" />
</form>
</body>
</html>
回答by Mark Redman
you can do something like:
您可以执行以下操作：
$(document).ready(function ()
{
setTimeout(nextNotice, 5000);
}
function nextNotice()
{
// do stuff
setTimeout(nextNotice, 5000);
}
回答by Igor Dymov
Use setInterval:
使用setInterval：
var timeOut = setInterval(nextNotice, 5000);
回答by Rob Stevenson-Leggett
var myFunction = function() {
//Do stuff
AnotherFunction();
};
var timeOut = setInterval(myFunction, 2000);
