xmlhttprequest的get post请求用法

GET请求用法：

function check(url){
	var xmlhttp = new XMLHttpRequest();
	xmlhttp.open("GET", url, true);
	xmlhttp.onreadystatechange = function(){
		//debugger;
		console.log(xmlhttp.readyState);
		console.log(xmlhttp.status);
			if(xmlhttp.readyState === 4){
					if(xmlhttp.status === 200){	
							location.href=value;
					}else if(xmlhttp.status === 404){
						alert("文件过时已被删除");
					}else if(xmlhttp.status === 0){	
						alert("文件过时已被删除或者网络不通");
					}
			}
	};
	xmlhttp.send(null);	
}

POST请求的用法：

		var AData = '{"sessionId":"999","infoId":"666336","networkId":"200","clientId": "1000","contentId":"789","reqNum":1}';
		var url = "http://10.10.1.111:9091/GetKK";
		var xmlhttp = new XMLHttpRequest();
		xmlhttp.open("POST", url, true);
		xmlhttp.send(AData);
		xmlhttp.onreadystatechange = function(){
				if(xmlhttp.readyState === 4){
						if(xmlhttp.status === 200){	
								var dataObj = eval("("+ xmlhttp.responseText +")");
						}
				}
		};