ajax实例AJAX异步传输用到哪些对象？具体实例。

AJAX异步传输用到哪些对象？具体实例。

function ajax(){ this.method; this.url; this.responsetype; this.content; var http_request = false; this.getExecObj = function(reValue){ if(window.XMLHttpRequest) { http_request = new XMLHttpRequest(); if (http_request.overrideMimeType) { http_request.overrideMimeType("text/xml"); } } else if (window.ActiveXObject) { try { http_request = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) { try { http_request = new ActiveXObject("Microsoft.XMLHTTP"); } catch (e) {} } } if (!http_request) { //window.alert("创建XMLHttpRequest对象实例失败."); return false; } if(this.method.toLowerCase()=="get") { http_request.open(this.method, this.url, true); } else if(this.method.toLowerCase()=="post") { http_request.open(this.method, this.url, true); http_request.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); } else { //window.alert("http请求类别参数错误。"); return false; } http_request.send(this.content); var reTextResponse = function() { if (http_request.readyState == 4) { if (http_request.status == 200) { reValue(http_request.responseText); } else { //alert("页面有异常。"); } } } var reXMLResponse = function() { if (http_request.readyState == 4) { if (http_request.status == 200) { reValue(http_request.responseXML); } else { //alert("页面有异常。"); } } } if(this.responsetype.toLowerCase()=="text") { http_request.onreadystatechange = reTextResponse; } else if(this.responsetype.toLowerCase()=="xml") { http_request.onreadystatechange = reXMLResponse; } else { //window.alert("参数错误。"); return false; } } } // 调用方法 var _ajax = new ajax() _ajax.method = "post"; //是get还是post _ajax.url = "Returnlist.aspx"; //请求的地址 _ajax.responsetype = "text"; //处理返回内容的类型 _ajax.content = "id=2"; //发送的内容 _ajax.getExecObj( //对返回值处理 function(str){ document.getElementById("select1").outerHTML = "<select name='select1' onchange='rsp(this)'><option value='0'>选择大产品</option>"+ str + "</select>" } ); 刚好有个项目代码 给你看看