几个关于HTML的js方法

//加入收藏
function addBookmark(title) {
	 var url=parent.location.href;
	 if (window.sidebar) {
			window.sidebar.addPanel(title, url,"");
	 } else if( document.all ) {
	 	window.external.AddFavorite( url, title);
	 } else if( window.opera && window.print ) {
	 	return true;
	 }
}
//设置首页
function setHome(obj,vrl){
	try{
		obj.style.behavior='url(#default#homepage)';obj.setHomePage(vrl);
	} catch(e){
		if(window.netscape) {
				try {
					netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
				} catch (e)  {
					alert("抱歉！您的浏览器不支持直接设为首页。请在浏览器地址栏输入“about:config”并回车然后将[signed.applets.codebase_principal_support]设置为“true”，点击“加入收藏”后忽略安全提示，即可设置成功。");
				}
				var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);
				prefs.setCharPref('browser.startup.homepage',vrl);
		 }
	}
}

var MY=new Object();
//Cookie读取函数
MY.Cookie = {
	set:function(name,value,expires,path,domain) {
		if(typeof expires=="undefined") {
			expires=new Date(new Date().getTime()+24*3600*1000);
		}
		document.cookie=name+"="+decodeURI(value)+((expires)?"; expires="+expires.toGMTString():"")+((path)?"; path="+path:"; path=/")+((domain)?";domain="+domain:"");
	},
	get:function(name) {
		var arr=document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
		if(arr!=null) {
			return decodeURIComponent(arr[2]);
		}
		return null;
	},
	clear:function(name,path,domain) {
		if(this.get(name)) {
			document.cookie=name+"="+((path)?"; path="+path:"; path=/")+((domain)?"; domain="+domain:"")+";expires=Fri, 02-Jan-1970 00:00:00 GMT";
		}
	}
}; 

//限制图片尺寸
function limitImage(ImgD, areaWidth, areaHeight){
	 var flag=false;
	 if (!areaWidth) {
	 	areaWidth = 600;  //图片区域的宽度。
	 }
	 if (!areaWidth) {
	 	areaHeight = 450; //图片区域的高度。
	 }
     var image = new Image();
	 try {
		 image.src = ImgD.src;
		 if(image.width>0 && image.height>0){
			 flag=true;
			 if(image.width/image.height>= areaWidth/areaHeight){
				 if(image.width>areaWidth) {
					ImgD.width=areaWidth;
					 ImgD.height=(image.height*areaWidth)/image.width;
				 } else {
					 ImgD.width=image.width;
					 ImgD.height=image.height;
				 }
			 } else {
				 if(image.height>areaHeight){
					 ImgD.height=areaHeight;
					 ImgD.width=(image.width*areaHeight)/image.height;
				 } else {
					 ImgD.width=image.width;
					 ImgD.height=image.height;
				 }
			 }
		 }
	 } catch (e) {
		//nothing
	 }
 }

//带参数的 复制到剪切板
function copyCodes(ele){
    if(copy2Clipboard(ele)!=false){
        alert("生成的代码已经复制到粘贴板，你可以使用Ctrl+V 贴到需要的地方去了哦！ ");
    }
}

//复制到剪切板
function copyCode(){
	var testCode = "";
	testCode += document.title + '  ' + this.location.href;
    if(copy2Clipboard(testCode)!=false){
        alert("生成的代码已经复制到粘贴板，你可以使用Ctrl+V 贴到需要的地方去了哦！ ");
    }
}
copy2Clipboard=function(txt){
    if(window.clipboardData){
        window.clipboardData.clearData();
        window.clipboardData.setData("Text",txt);
    }
    else if(navigator.userAgent.indexOf("Opera")!=-1){
        window.location=txt;
    }
    else if(window.netscape){
        try{
            netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
        }
        catch(e){
            alert("您的firefox安全限制限制您进行剪贴板操作，请打开'about:config'将signed.applets.codebase_principal_support'设置为true'之后重试，相对路径为firefox根目录/greprefs/all.js");
            return false;
        }
        var clip=Components.classes['@mozilla.org/widget/clipboard;1'].createInstance(Components.interfaces.nsIClipboard);
        if(!clip)return;
        var trans=Components.classes['@mozilla.org/widget/transferable;1'].createInstance(Components.interfaces.nsITransferable);
        if(!trans)return;
        trans.addDataFlavor('text/unicode');
        var str=new Object();
        var len=new Object();
        var str=Components.classes["@mozilla.org/supports-string;1"].createInstance(Components.interfaces.nsISupportsString);
        var copytext=txt;str.data=copytext;
        trans.setTransferData("text/unicode",str,copytext.length*2);
        var clipid=Components.interfaces.nsIClipboard;
        if(!clip)return false;
        clip.setData(trans,null,clipid.kGlobalClipboard);
    }
}

/**
 * 获取url地址参数
 */
function getUrlParam(paramName) {
	var returnVal="";
	try{
		var paramUrl=window.location.search;
		//处理长度
		if (paramUrl.length>0) {
			paramUrl = paramUrl.substring(1, paramUrl.length);
			var paramUrlArray = paramUrl.split("&");
			for (var i=0; i<paramUrlArray.length; i++) {
				if (paramUrlArray[i].toLowerCase().indexOf(paramName.toLowerCase())!=-1) {
					var temp=paramUrlArray[i].split("=");
					if(temp[0].toLowerCase()==paramName.toLowerCase()) {
						returnVal=temp[1];
						break;
					}
				}
			}
		}
		returnVal = decodeURIComponent(returnVal);
	} catch(e) {
		//nothing
	};
	return returnVal;
}

//渠道来源记录
try {
	if (getUrlParam('utm_source')!="" && getUrlParam('utm_medium')!="") {
		MY.Cookie.set('utm_tag', getUrlParam('utm_source') + '|' + getUrlParam('utm_medium') + '|' + getUrlParam('utm_place'), new Date(new Date().getTime()+1*24*3600*1000), '/', 'game.10086.cn');
	}
} catch(e) {
	//nothing
}