check the links is visible or not

检查超链接是否有效
当前为 2015-08-20 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name    check the links is visible or not
// @author  burningall
// @description 检查超链接是否有效
// @version     2015.8.21
// @include     *
// @grant       GM_registerMenuCommand
// @grant		GM_xmlhttpRequest
// @run-at      document-start
// @compatible  chrome  推荐
// @compatible  firefox  不推荐
// @license     The MIT License (MIT); http://opensource.org/licenses/MIT
// @supportURL      http://www.burningall.com
// @contributionURL [email protected]|alipay.com
// @namespace https://gf.qytechs.cn/zh-CN/users/3400-axetroy
// ==/UserScript==

(function(document){
var config = {
	"autoLoad":false//脚本开始加载，是否自动ajax。（不建议为true，大量ajax会影响性能，甚至假死）
};

function Ob(target,config,fn){
    var MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver;
    var observer = new MutationObserver(function(mutations){
            mutations.forEach(function(mutation) {
                    fn.call(target);
            });
        });
    observer.observe(target, config);
}

function addEvent(obj, type, fn){
	return obj.addEventListener ?
			obj.addEventListener(type, function(e){
				var ev = window.event ? window.event : (e ? e : null);
				if( fn.call(obj,ev)===false ){
					e.cancelBubble = true;//阻止冒泡
					e.preventDefault();//chrome，firefox下阻止默认事件
				}
			}, false)
			 :
			obj.attachEvent('on' + type, function(e){
				ev.target = ev.target || ev.srcElement;
				if(fn.call(obj,ev)===false ){
					e.cancelBubble = true;//阻止冒泡
					return false;//阻止默认事件，针对IE8
				}
			});
}

function check(urlLink,a,secFn,failFn){
	a.setAttribute("checking",true);
	GM_xmlhttpRequest({
	  method: "GET",
	  url: urlLink,
	  onerror: function(response ){
	  	failFn(a);
	  },
	  onreadystatechange:function(response){
	  	if(response.readyState==4){
	  		var status = response.status+'';
	  		if( status.charAt(0)=="4" || status.charAt(0)=="5" ){//4XX，5XX错误
	  			failFn(a);
	  		}else{
	  			secFn(a);
	  		}
	  	}
	  }
	});
}

var reg = /[a-zA-z]+:\/\/[^\s]*/i;

function init(){
	var link = document.querySelectorAll('a[href*="http"]:not([checking]):not([visible])');
	var arr = [];
	var temps = [];
	var agms = 20;
	if( link.length>=200 && link.length<500 ){
		agms = 50;
	}else if(link.length>=500){
		return;
	}
	var step = Math.ceil( (link.length-1)/agms );//分组，总共agms组装完，每组step个数
	for(var j=0;j<link.length;j++){
		//每隔10个
		if( j>0 && j%step===0 ){
			arr.push( temps );
			temps = [];
		}
		//收尾零头
		if( link.length-j<step ){
			temps.push( link[j] );
			if( link.length-1==j ){
				arr.push( temps );
				temps = [];
			}
		}else{
			temps.push( link[j] );
		}
	}
	// console.log( link.length + ":" +arr.length );
	var num = 0;
	function start(index){
		if( arr.length<1 || typeof arr[index] == "string" || typeof (arr[index]) !== "object" ){
			return;
		}
		//判断这一组是否加载完毕
		var jugg = [];
		for(var y=0;y<arr[index].length;y++){
			var a = arr[index][y];
			if( reg.test(a.href)===false || a.getAttribute('visible')!==null ){
				continue;
			}
			check(a.href,a,function(a){
				//成功
				// a.style.cssText = "background:rgba(46, 212, 169, 0.14) !important";
				if( a.getAttribute('visible')==="false" ){
					a.style.cssText = "background:rgba(46, 212, 169, 0.14) !important; text-decoration:none !important;color:#ccc !important";
				}
				a.setAttribute('visible',"true");
				a.removeAttribute('checking');
				jugg.push(true);
				if(num>arr.length-1){
					return;
				}
				if(jugg.length>=length-1){
					setTimeout(function(){
						start(num++);
					},200);
				}
			},function(){
				//失败
				a.style.cssText = "background:red !important; text-decoration:line-through !important;color:#ccc !important";
				a.setAttribute('visible',"false");
				a.removeAttribute('checking');
				jugg.push(false);
				if(num>arr.length-1){
					return;
				}
				if(jugg.length>=length-1){
					setTimeout(function(){
						start(num++);
					},200);
				}
			});
			console.log( index+":"+y );
		}
	}
	start(num);
}

addEvent(document,'mouseover',function(e){
	var target = e.target || e.srcElement;
	if( target.tagName == "A" && reg.test(target.href) ){
		if( target.getAttribute('visible')==="true" ){
			return;
		}
		check(target.href,target,function(target){
			//加载成功
			if( target.getAttribute('visible')==="false" ){
				target.style.cssText = "background:rgba(46, 212, 169, 0.14) !important; text-decoration:none !important;color:#ccc !important";
			}
			target.setAttribute('visible',"true");
			target.removeAttribute('checking');
		},function(){
			//加载失败
			target.style.cssText = "background:red !important; text-decoration:line-through !important;color:#ccc !important";
			target.setAttribute('visible',"false");
			target.removeAttribute('checking');
		});
	}
});

addEvent(window,'DOMContentLoaded',function(){
	if( config.autoLoad === true ){
		init();
		new Ob(document.documentElement,{
			"childList":true,
			"subtree":true
		},function(){
			init();
		});
	}

});

//注册(不可用)菜单
GM_registerMenuCommand("检查全部链接", init);
})(document);
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