js实现轮播图（手动+自动）

设置大体样式

html 复制代码

<input type="button" value="<" id="pre" onclick="pre()" onmouseover="stop()" onmouseout="start()" class="left">
<img src="../img/1.jpg" id="imgid" onmouseover="stop()" onmouseout="start()">
<input type="button" value=">" id="next" onclick="next()" onmouseover="stop()" onmouseout="start()" class="right">

将图片设置为相对定位，按钮设置为绝对定位，这样就可以将按钮镶嵌在图片中

css 复制代码

<style type="text/css">
			#imgs{
				position: relative;
				}
			.right,.left{
				position: absolute;
				top:230px;
				border-radius:50%
			}
			.right{
				left:575px ;
			}
</style>

图片播放

javascript 复制代码

var imgArr = ["../img/1.jpg","../img/2.jpg","../img/3.jpg","../img/4.jpg","../img/5.jpg"];				
				var index =0 ;		
				
				function pre(){
					var img = document.getElementById("imgid");	
					if(index == 0){
						index = 5;
					}
					index-=1;
					img.src = imgArr[index];
				}
				function next(){
					var img = document.getElementById("imgid");	
					if(index == 4){
						index = -1;
					}
					index+=1;
					img.src = imgArr[index];
}

添加dom对象，将图片存入数组中，用下标来访问图片内容

javascript 复制代码

var t;
function start(){
	t = setInterval(next,1000)
}
function stop(){
	clearInterval(t);
}

设置自动播放的事件，并添加onmouseover和onmouseout事件，当鼠标放在图片或者按钮上，停止自动播放，离开后开始自动播放

完整代码

html 复制代码

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			#imgs{
				position: relative;
				}
			.right,.left{
				position: absolute;
				top:230px;
				border-radius:50%
			}
			.right{
				left:575px ;
			}	
		</style>
	</head>
	<body>
		<script>		
				var imgArr = ["../img/1.jpg","../img/2.jpg","../img/3.jpg","../img/4.jpg","../img/5.jpg"];				
				var index =0 ;		
				
				function pre(){
					var img = document.getElementById("imgid");	
					if(index == 0){
						index = 5;
					}
					index-=1;
					img.src = imgArr[index];
				}
				function next(){
					var img = document.getElementById("imgid");	
					if(index == 4){
						index = -1;
					}
					index+=1;
					img.src = imgArr[index];
				}
				var t;
				function start(){
					t = setInterval(next,1000)
				}
				
				function stop(){
					clearInterval(t);
				}
		</script>	
		<input type="button" value="<" id="pre" onclick="pre()" onmouseover="stop()" onmouseout="start()" class="left">
		<img src="../img/1.jpg" id="imgid" onmouseover="stop()" onmouseout="start()">
		<input type="button" value=">" id="next" onclick="next()" onmouseover="stop()" onmouseout="start()" class="right">
	</body>
</html>