ajax封装类
[*]function ajax(method,synchronous){
[*]
[*] this._httpReq = false; /*ajax初始化对象*/
[*] this.method = method; /*get|post*/
[*] this.syn = synchronous; /*是否采用异步请求，默认true*/
[*]
[*] this.url = ""; /*提交异步请求的url地址*/
[*] this.resType = ""; /*异步请求返回数据类型text|xml*/
[*] this.callback = ""; /*异步请求完成后的回滚函数*/
[*] this.loading = ""; /*load函数*/
[*] this.content = null; /*Ajax中send方法的参数*/
[*] this.readystate = -1; /*ajax的请求状态*/
[*] this.state = -1; /*http请求响应代码*/
[*]
[*] /************ get/set方法开始 ***************/
[*] //设置提交异步请求的url地址
[*] this.setUrl = function (url){
[*] this.url = url;
[*] }
[*]
[*] //设置异步请求返回数据类型text|xml
[*] this.setResType = function (restype){
[*] this.resType = restype;
[*] }
[*]
[*] //设置回滚函数
[*] this.setCallback = function (func){
[*] this.callback = func;
[*] }
[*]
[*] //设置load函数
[*] this.setLoading = function (loadFunc){
[*] this.loading = loadFunc;
[*] }
[*]
[*] //设置send自带的参数值，默认null
[*] this.setContent = function (contents){
[*] this.content = contents;
[*] }
[*] /*********get/set方法结束*******/
[*]
[*] /*********状态显示方法*********/
[*] //调用window.alert方法
[*] this.alert = function (msg){
[*] window.alert(msg);
[*] }
[*]
[*] //调用window.status的方法
[*] this.status = function (msg){
[*] window.status = msg;
[*] }
[*] /*********状态显示方法结束*********/
[*]
[*] /*************执行方法开始*****************/
[*] //创建HttpXMLRequest
[*] this.createXMLRequest = function(){
[*] if(window.XMLHttpRequest){
[*] this._httpReq = new XMLHttpRequest();
[*]
[*] if(this._httpReq.overrideMimeType){
[*] this._httpReq.overrideMimeType("text/xml");
[*] }
[*] }else if(window.ActiveXObject){
[*] try{
[*] this._httpReq = new ActiveXObject("Msxml2.XMLHTTP");
[*] }catch(e){
[*] try{
[*] this._httpReq = new ActiveXObject("Microsoft.XMLHTTP");
[*] }catch(e){}
[*] }
[*] }
[*] }
[*]
[*] //初始化ajax对象
[*] this.init = function(){
[*] this.createXMLRequest();
[*] }
[*]
[*] //发送一个http请求
[*] this.send = function (){
[*] if(this.resType.toLowerCase()=="post"){
[*] _httpReq.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
[*] }
[*] this._httpReq.open(this.method,this.url,this.syn);
[*] this._httpReq.send(this.content);
[*] }
[*]
[*] //取消一个http请求
[*] this.abort = function (){
[*] this._httpReq.abort();
[*] }
[*]
[*] this.callbackState = function(){
[*] switch(this._httpReq.readyState){
[*] case 0:
[*] this.readystate = 0;
[*] break;
[*] case 1:
[*] this.readystate = 1;
[*] break;
[*] case 2:
[*] this.readystate = 2;
[*] break;
[*] case 3:
[*] this.readystate = 3;
[*] break;
[*] case 4:
[*] this.readystate = 4;
[*] switch(this._httpReq.status){
[*] case 200:
[*] eval(this.callback);
[*] break;
[*] case 202:
[*] this.status("请求处理中，还没处理完毕！");
[*] break;
[*] case 400:
[*] this.status("错误的请求！");
[*] break;
[*] case 404:
[*] this.status("请求资源未找到！");
[*] break;
[*] case 500:
[*] this.status("内部服务器错误，请联系管理员！");
[*] break;
[*] default:
[*] this.status("返回数据失败,"+this._httpReq.status);
[*] break;
[*] }
[*] break;
[*] default:
[*] this.readystate = 0;
[*] break;
[*] }
[*] }
[*]
[*] this.onReadyStateChange = function (){
[*] var owner = this;
[*] this._httpReq.onreadystatechange = function(){
[*] owner.callbackState.call(owner);
[*] }
[*] }
[*] /*************执行方法结束*****************/
[*]}
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