/**
 * Author:殘雪易冷 | E-mail: xueruos520@163.com                   
 * Copyright (c) 版权所有 无锡君通软件                                   
 * 2010.9.25
 * blog.csnowy.com
 */
function Ajax() {
    var HttpRequest = false;
    var Url = null;
    var ContentType = "text";
    this.init = function () //创建XMLHttpRequest的功能函数
    {
        if (window.ActiveXObject && !window.XMLHttpRequest) {
            window.XMLHttpRequest = function () {
                var msxmls = ['Msxml2.XMLHTTP.5.0', 'Msxml2.XMLHTTP.4.0', 'Msxml2.XMLHTTP.3.0', 'Msxml2.XMLHTTP', 'Microsoft.XMLHTTP'];
                for (var i = 0; i < msxmls.length; i++) {
                    try {
                        return new ActiveXObject(msxmls[i]);
                    }
                    catch (e) {}
                }
                return null;
            };
        }
        HttpRequest = new XMLHttpRequest();
        if (!HttpRequest) {
            return false;
        }
        return HttpRequest;
    }
    this.getType = function (type) //得到请求的类型
    {
        type = type.toUpperCase();
        if (type != "HEAD" && type != "POST" && type != "GET") type = "HEAD";
        return type;
    }
    this.getContentType = function (type) //要得到内容的类型XML/TEXT
    {
        type = type.toLowerCase();
        if ("xml" == type) {
            ContentType = "xml";
            return "text/xml";
        }
        else {
            ContentType = "text";
        }
        if ("text" == type) return "text/plain";
        if ("app" == type) return "application/x-www-form-urlencoded";
        return "text/plain";
    }
    this.getInfo = function (url, type, content, send, id, backtype, load_id, unready) //主要的函数得到内容
    {
        HttpRequest = this.init();
        send = send.replace(/(^\s*)|(\s*$)/g, "");
        type = this.getType(type);
		//id = eval(id);
        if (type == 'GET') {
            if (url.indexOf("?") > 0) {
                if (send.substring(0, 1) == '&') url = url + send;
                else url = url + "&" + send;
            }
            else url = url + "?" + send;
        }
        HttpRequest.open(type, url, true);
        HttpRequest.onreadystatechange = function () //得到更新内容
        {

            if (HttpRequest.readyState == 4) {
            	        //请求完成
		                if (HttpRequest.status == 200) {
							//关闭加载提示信息
							if(backtype == 1){
							  document.getElementById(load_id).innerHTML = '';
				            }else{
							  closeWindow("tranDiv_3");
							}
		                	//请求完成执行
		                    if (id != ''){
				                    if ("HEAD" == type) {
				                        if (id instanceof Function) {
				                            id(HttpRequest.getAllResponseHeaders());
				                        }
				                        else {
				                            if (document.getElementById(id)) {
				                                document.getElementById(id).innerHTML = HttpRequest.getAllResponseHeaders();
				                            }
				                        }
				                    }
				                    else {
				                        if ("text" == ContentType) {
				                            if (id instanceof Function) {
											  /* 传入的为函数 */
				                                id(HttpRequest.responseText.replace(/(^\s*)|(\s*$)|(　*)/g, ""));
				                            }
				                            else {
				                              /* 传入的为ID */
													document.getElementById(id).innerHTML = HttpRequest.responseText.replace(/(^\s*)|(\s*$)|(　*)/g, "");
				                            }
				                        }
				                        else {
				                            if (id instanceof Function) {
				                                id(HttpRequest.responseXML);
				                            }
				                            else {
				                                if (document.getElementById(id)) {
				                                    document.getElementById(id).innerHTML = HttpRequest.responseXML;
				                                }
				                            }
				                        }
				                    }
		                    }
							else{
								return;
							}
		                }
		                else if (HttpRequest.status == 404) {
		                    alert("请求的URL地址不存在！");
		                }
		                else if (HttpRequest.status == 403) {
		                    alert("请求的URL地址禁止访问！");
		                }
		                else if (HttpRequest.status == 401) {
		                    alert("请求的URL地址未经受权！");
		                }
            } else {
				if(backtype == 1){
				  document.getElementById(load_id).innerHTML = '<img src="images/load.gif" />正在加载信息，请稍后...';
				}else{
            	  alertloadDiv();
				}
                if (unready instanceof Function) {
                    eval(unready);
                }
            }
        }
        HttpRequest.setRequestHeader("cache-control", "no-cache");
        if (this.getType(type) == "POST") {
            send = encodeURI(send);
            content = "app";
        }
        else {
            send = null;
        }
        HttpRequest.setRequestHeader("Content-Type", this.getContentType(content) + ";encoding=utf-8");
        HttpRequest.send(send);
    };
}
var CX=new Ajax();