try{
		var setDomain = window.location.hostname.replace("http://", "")
					.replace("https://", "");
			if (setDomain.match(/[a-z]+/) != null) {
				var domainArr = setDomain.split(".");
				var preDomain=domainArr[domainArr.length - 2] + "."
						+ domainArr[domainArr.length - 1];
				if(/(com|cn|org|net|xin|edu)\..*/.test(preDomain)){
				   preDomain=domainArr[domainArr.length - 3]+"."+domainArr[domainArr.length - 2] + "."
						+ domainArr[domainArr.length - 1];
				}		
				document.domain = preDomain;
			}
       }catch(e){
		console.log(e);
		}