点击按钮，网页变暗、屏幕锁定Js代码

2024-09-05 12:21:57

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一款JavaScript特效代码，在网页上点击按钮，网页变暗，且屏幕被锁定，变得不可操作。大家还记得一些大论坛不？在登录时候网页背景变暗，除了登录框外，其它地方均被锁定，不能操作，类似本代码的效果。

<!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>

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