Analysis process:
Switch picture:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
function changeImg() {
alert("123")
var img222 = document.getElementById(img1);
img222.src = "img/2.jpg";
}
</script>
</head>
<body>
<input type="button" value="点击换图片" onclick="changeImg()">
<img src="img/1.jpg" id="img1">
</body>
</html>Do one thing every three seconds:
window.setInterval (): Call a function or calculate an expression according to the specified period (in milliseconds)
setInterval("alert('123')",2000)
window does not need to be written, the first A variable needs to use "", and the "" inside needs to become ''
window.setTimeout(): Call a function or calculate an expression after a specified number of milliseconds
window.clearInterval( ):
window.setInterval() method or returns an id of type int. You can assign the id to window.clearInterval() to close
window.clearTimeout():
Specific code implementation :
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script>
/* 当页面加载完成的时候, 动态切换图片
1.确定事件:
2.事件所要触发的函数
*/
var index = 1; //切换图片的函数
function changeAd(){ //获取要操作的img
var img = document.getElementById("imgAd");
img.src = "../img/"+(index%3+1)+".jpg"; //0,1,2 //1,2,3
index++;
}
function init(){ //启动定时器
setInterval("changeAd()",3000);
}
</script>
</head>
<body onload="init()">
<img src="../img/1.jpg" id="imgAd"/>
</body>
</html> Recommended tutorial: js entry tutorial
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