BBWPS 宾馆管理系统　php+mysql

					var http_request = false;
					function request(){
						http_request = false;
				    //开始初始化XMLHttpRequest对象
				    if(window.XMLHttpRequest) { //Mozilla 浏览器
				    http_request = new XMLHttpRequest();
				    if (http_request.overrideMimeType) {//设置MiME类别
				        http_request.overrideMimeType('text/xml');
				    }
				     }
				else if (window.ActiveXObject) { // IE浏览器
				try {
				http_request = new ActiveXObject("Msxml2.XMLHTTP");
				} catch (e) {
				try {
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
				} catch (e) {}
				}
				}
				if (!http_request) { // 异常，创建对象实例失败
				window.alert("不能创建XMLHttpRequest对象实例.");
				return false;
				}
				else{
					return http_request;
				}
				}