Web Front-endJS TutorialThe difference between setTimeout() and setInterval() timers in JavaScriptThe difference between setTimeout() and setInterval() timers in JavaScript
This article will introduce to you the differences in the use of setTimeout() and setInterval() timers in JavaScript. (Recommended: "javascript tutorial")
setTimeout() method
setTimeout() method is waiting for the specified Execute a function after the number of milliseconds.
Syntax:
window.setTimeout(function, milliseconds); function : 第一个参数是要执行的函数 milliseconds : 表示执行前的毫秒数.
For example, we want a prompt box to pop up 2 seconds after the user presses the "Click me!" button.
The javascript code is as follows:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<button onclick="setTimeout(gfg, 2000);">点击我！</button>
<script>
function gfg()
{
alert('欢迎来到PHP中文网！');
}
</script>
</body>
</html>Output:
Once the user presses the "Press Me" button, then after a pause of 2 seconds, a box will pop up.
##setInterval() method
setInterval()method Repeat a given function at every given time interval.
window.setInterval(function, milliseconds); function : 第一个参数是要执行的函数 milliseconds :表示每次执行之间的时间间隔的长度。The code example is as follows:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<p>我会说“你好”很多次！</p>
<p id="GFG"></p>
<script>
var myVar = setInterval(myTimer, 1000);
function myTimer()
{
document.getElementById("GFG").innerHTML += "<p>你好</p>";
}
</script>
</body>
</html>A new "Hello" message will be displayed every second.
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