【代码教程】点击按钮，网页变暗、屏幕锁定Js代码

2013-08-18 21:13:00 -0400

代码如下：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>网页变暗、屏幕锁定</title>
<style>
#pageOverlay { visibility:hidden; position:fixed; top:0; left:0; z-index:1987; width:100%; height:100%; background:#000; filter:alpha(opacity=70); opacity:0.7; }
/*IE6 fixed*/
* html { background:url(*) fixed; }
* html body { margin:0; height:100%; }
* html #pageOverlay { position: absolute; left: expression(documentElement.scrollLeft + documentElement.clientWidth - this.offsetWidth); top: expression(documentElement.scrollTop + documentElement.clientHeight - this.offsetHeight); }
</style>
<script>
(function(){
	// 获取对象
	var $ = function (id){
		return document.getElementById(id);
	};
	// 遍历
	var each = function(a, b) {
		for (var i = 0, len = a.length; i < len; i++) b(a[i], i);
	};
	// 事件绑定
	var bind = function (obj, type, fn) {
		if (obj.attachEvent) {
			obj['e' + type + fn] = fn;
			obj[type + fn] = function(){obj['e' + type + fn](window.event);}
			obj.attachEvent('on' + type, obj[type + fn]);
		} else {
			obj.addEventListener(type, fn, false);
		};
	};
	
	// 移除事件
	var unbind = function (obj, type, fn) {
		if (obj.detachEvent) {
			try {
				obj.detachEvent('on' + type, obj[type + fn]);
				obj[type + fn] = null;
			} catch(_) {};
		} else {
			obj.removeEventListener(type, fn, false);
		};
	};
	
	// 阻止浏览器默认行为
	var stopDefault = function(e){
		e.preventDefault ? e.preventDefault() : e.returnValue = false;
	};
	// 获取页面滚动条位置
	var getPage = function(){
		var dd = document.documentElement,
			db = document.body;
		return {
			left: Math.max(dd.scrollLeft, db.scrollLeft),
			top: Math.max(dd.scrollTop, db.scrollTop)
		};
	};
	
	// 锁屏
	var lock = {
		show: function(){
			$('pageOverlay').style.visibility = 'visible';
			var p = getPage(),
				left = p.left,
				top = p.top;
			
			// 页面鼠标操作限制
			this.mouse = function(evt){
				var e = evt || window.event;
				stopDefault(e);
				scroll(left, top);
			};
			each(['DOMMouseScroll', 'mousewheel', 'scroll', 'contextmenu'], function(o, i) {
					bind(document, o, lock.mouse);
			});
			// 屏蔽特定按键: F5, Ctrl + R, Ctrl + A, Tab, Up, Down
			this.key = function(evt){
				var e = evt || window.event,
					key = e.keyCode;
				if((key == 116) || (e.ctrlKey && key == 82) || (e.ctrlKey && key == 65) || (key == 9) || (key == 38) || (key == 40)) {
					try{
						e.keyCode = 0;
					}catch(_){};
					stopDefault(e);
				};
			};
			bind(document, 'keydown', lock.key);
		},
		close: function(){
			$('pageOverlay').style.visibility = 'hidden';
			each(['DOMMouseScroll', 'mousewheel', 'scroll', 'contextmenu'], function(o, i) {
				unbind(document, o, lock.mouse);
			});
			unbind(document, 'keydown', lock.key);
		}
	};
	bind(window, 'load', function(){
		$('btn_lock').onclick = function(){
			lock.show();
		};
		$('pageOverlay').onclick = function(){
			lock.close();
		};
	});
})();
</script>
</head>
<body>
<button id="btn_lock" style="position: absolute; left:50%; top:40%; ">开启锁屏</button>
<ol id="test">
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
<li>囧</li>
</ol>
<div id="pageOverlay"></div>
</body>
</html>

效果如下：
网页变暗、屏幕锁定

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