JS创建XMLHttpRequest对象

JS创建XMLHttpRequest对象，给出2种方法：

第一种：

var xmlHttp;			
function creatHttpRequest(){
	if(window.ActiveXObject){
		xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
	}
	else{
		xmlHttp = new XMLHttpRequest();
	}
}
creatHttpRequest();

第二种：

var HttpObject;
try{
		HttpObject=new XMLHttpRequest();
	}
catch(e){
		try{
			HttpObject = new ActiveXObject("Microsoft.XMLHTTP");
		}
		catch(e){
			try{
				HttpObject = new ActiveXObject("Msxml2.XMLHTTP");
			}
			catch(e){
				console.log(e.message)
				alert("你的浏览器不支持AJax");
			}
		}
	}
console.log(HttpObject);