JS切换图片

JS格式：

var i = 1;

function changeImg(){}

docunment.getElementById("img1").src="../../img/"+i+".jpg";

<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>切换图片</title>
		<style>
			div{
				border: 1px solid white;
				width:500px ;
				height: 350px;
				margin: auto;
				text-align: center;
			}
		</style>
		<script>
			var i=1;
			function changeImg(){
				i++;
				if(i==4){
					i=1;
				}
				document.getElementById("img1").src="../../img/"+i+".jpg";
				
			}
		</script>
	</head>
	<body>
		<div>
			<input type="button" value="下一张" onclick="changeImg()"/>
			<img src="../../img/1.jpg" width="100%" height="100%" id="img1"/>
		</div>
	</body>
</html>

 

posted @ 2019-03-07 14:53  strawqqhat  阅读(174)  评论(0)    收藏  举报
#home h1{ font-size:45px; } body{ background-image: url("放你的背景图链接"); background-position: initial; background-size: cover; background-repeat: no-repeat; background-attachment: fixed; background-origin: initial; background-clip: initial; height:100%; width:100%; } #home{ opacity:0.7; } .wall{ position: fixed; top: 0; left: 0; bottom: 0; right: 0; } div#midground{ background: url("https://i.postimg.cc/PP5GtGtM/midground.png"); z-index: -1; -webkit-animation: cc 200s linear infinite; -moz-animation: cc 200s linear infinite; -o-animation: cc 200s linear infinite; animation: cc 200s linear infinite; } div#foreground{ background: url("https://i.postimg.cc/z3jZZD1B/foreground.png"); z-index: -2; -webkit-animation: cc 253s linear infinite; -o-animation: cc 253s linear infinite; -moz-animation: cc 253s linear infinite; animation: cc 253s linear infinite; } div#top{ background: url("https://i.postimg.cc/PP5GtGtM/midground.png"); z-index: -4; -webkit-animation: da 200s linear infinite; -o-animation: da 200s linear infinite; animation: da 200s linear infinite; } @-webkit-keyframes cc { from{ background-position: 0 0; transform: translateY(10px); } to{ background-position: 600% 0; } } @-o-keyframes cc { from{ background-position: 0 0; transform: translateY(10px); } to{ background-position: 600% 0; } } @-moz-keyframes cc { from{ background-position: 0 0; transform: translateY(10px); } to{ background-position: 600% 0; } } @keyframes cc { 0%{ background-position: 0 0; } 100%{ background-position: 600% 0; } } @keyframes da { 0%{ background-position: 0 0; } 100%{ background-position: 0 600%; } } @-webkit-keyframes da { 0%{ background-position: 0 0; } 100%{ background-position: 0 600%; } } @-moz-keyframes da { 0%{ background-position: 0 0; } 100%{ background-position: 0 600%; } } @-ms-keyframes da { 0%{ background-position: 0 0; } 100%{ background-position: 0 600%; } }