js屏蔽广告详解编程语言

(function () { 
    var createElement = document.createElement; 
    document.createElement = function (tag) { 
        switch (tag) { 
            case 'script': 
                console.log('禁用动态添加脚本，防止广告加载'); 
                break; 
            default: 
                return createElement.apply(this, arguments); 
        } 
    } 
})(); 

//注入页面的脚本文件 
; 
$(function() { 
 
	var clearAd = { 
		//由于manifest文件匹配规则只有通配没有非功能，所以可在此处添加不想删除广告的页面 
		checkUrl: function() { 
			var Checkflag = 0, 
				url = window.location.href; 
 
			//手动添加不需要清除广告的域 
			var notDel = [ 
				"www.baidu.com", 
				"taobao.com", 
				"tmall.com", 
				"jd.com" 
			]; 
 
			//正则匹配 
			for (var i = 0; i < notDel.length; i++) { 
				var reg = new RegExp(notDel[i], "g"); 
 
				if (reg.test(url)) { 
					console.log('This page does not clear ads.'); 
					break; 
				} else { 
					if (i == notDel.length - 1) { 
						Checkflag = 1; 
					} 
				} 
			} 
			 
			if (Checkflag == 1) { 
				this.clear(); 
				this.findSomeAdPossible(); 
			} 
		}, 
		clear: function() { 
			console.log('Clear Start'); 
			//此处可手动添加广告框id名，去除顽疾ad必备 
			var ad_id_name = [ 
				"cproIframe2001holder", 
				"cproIframe2002holder", 
				"cproIframe2003holder", 
				"cproIframe2004holder", 
				"cproIframe2005holder", 
				"cproIframe2006holder", 
				"cproIframe2007holder", 
				"cproIframe2008holder", 
				"cproIframe2009holder", 
				"id_300x250_banner_top", 
				"ads", 
				"google_image_div", 
				"mx_cs_71603_1261456", 
				"AC_TR86_71603", 
				"cproIframe_u2060917_1", 
				"content_right", 
				"left-promotion", 
				"top_ads", 
				"layerd" 
			]; 
 
			//此处添加广告框类名 
			var ad_css_name = [ 
				"cproIframe_u410704_3", 
				"img_ad", 
				"hover_btn" 
			]; 
 
			for (var i = 0; i < ad_id_name.length; i++) { 
				//使用remove删除节点，提升性能 
				$('#' + ad_id_name[i]).remove(); 
			} 
 
			for (var i = 0; i < ad_css_name.length; i++) { 
				$('.' + ad_css_name[i]).remove(); 
			} 
		}, 
		//简单的智能算法 
		findSomeAdPossible: function() { 
			var sap = $('div iframe'), 
				ad_img = $('div script').parent().find('img,embed'), 
				float_img = $('div object').parent().find('img,embed'); 
 
			this.arrayDel(sap, 360, 200); 
			this.arrayDel(ad_img, 350, 150); 
			this.arrayDel(float_img, 350, 150); 
		}, 
		arrayDel: function(arr, conWidth, conHeight) { 
			var len = arr.length; 
 
			for (var i = 0; i < len; i++) { 
				var self = arr.eq(i); 
 
				if (self.width() <= conWidth || self.height() <= conHeight) { 
					self.remove(); 
				} 
 
			} 
		}, 
		init: function() { 
			this.checkUrl(); 
		} 
	} 
 
	$(document).ready(function() { 
		clearAd.init(); 
 
		//为防止ajax异步延时加载的广告隔4s再清除一次 
		setTimeout(function() { 
			clearAd.init(); 
		}, 4000) 
	}); 
})