规定区域的JS拖动展示效果_图片特效特效

规定区域的JS拖动展示，运行看下效果你就明白了，在指定区域内显示图像，鼠标可以拖动图像查看，自动感应图像边界，非常不错。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>规定区域的JS拖动展示效果</title>
<style>
	body{background:#000; }
	.box{
		width:360px; 
		height:360px; 
		border:5px solid #555;
		overflow:hidden; 
		position:relative;
		margin:0 auto; 
	}
	.box img{
		cursor:move;
		position:absolute; 
	}
</style>
</head>
<body>
<div class="box" id="map"><img src="http://p1.mb5u.com/texiao/1/20110225160529459.gif"></div>
</body>
<script>
function BuleJS(box) {
	var _box = document.getElementById(box),el = _box.getElementsByTagName("IMG")[0],
	r = el.offsetWidth - _box.offsetWidth,bi = el.offsetHeight - _box.offsetHeight;
	function getXY(e) {
		return e ? [e.pageX, e.pageY] : [event.clientX, event.clientY]
	};
	el.onmousedown = function(e) {
		var a = getXY(e),b = [el.offsetLeft,el.offsetTop];
		this.setCapture ? this.setCapture() : e.preventDefault();
		document.onmousemove = function(e) {
			var c = getXY(e);
			el.style.left = Math.max( - r, Math.min(0, c[0] - a[0] + b[0]));
			el.style.top = Math.max( - bi, Math.min(0, c[1] - a[1] + b[1]));
		}
	};
	document.onmouseup = function(e) {
		e || el.releaseCapture();
		document.onmousemove = null;
	}
};
BuleJS('map');
</script>
</html>

所属频道：图片特效特效/更新时间：2012-11-30

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