前端之家收集整理的这篇文章主要介绍了
找到一个很好的AjaxHelper类，
前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。
function AjaxHelper() {//timeout()超时方法,outtime超时毫秒,type[post/get],loading(),complete(),data,success(),error(),url,err(),vf() var xhobj,timer,s; var vfsec = 5000; function getBU(url) { return url; //"/web"+ } this.validBackValue = function (jM) { return validBackValueIn(jM); } function validBackValueIn(jM) { if (jM.toString().indexOf("{res:") > -1) { jM = eval("(" + jM + ")"); if (jM.res == "vf") { setTimeout("window.location ='" + getBU(jM.loginUrl) + "'",vfsec); } //如果身份验证失败 return jM; } else return { res: 'f' }; } this.doAjaxJuge = function (jM) { jM.msgBox.showWait(); this.doAjax({ url: jM.url,data: jM.data,type: jM.type,success: function (m) { m = validBackValueIn(m); if (m.res == "f") { jM.msgBox.showReqErr(); if (jM.err) jM.err(); } else if (m.res == "vf") { jM.msgBox.showSysMsgWTime("会话过期,5秒后自动返回登录界面 -o-!",1,vfsec); if (jM.vf) jM.vf(); } else { jM.msgBox.showReqOk(); jM.success(m); } } }); } this.doAjax = function (jsonParas) { s = jsonParas; if (null != xhobj) { clearTimeout(timer); xhobj.abort(); xhobj = null; } xhobj = createXmlHttp(); // xmlHttp(); if (!s.type) s.type = "POST"; //默认为post else s.type = s.type.toUpperCase(); xhobj.open(s.type,(s.type == "GET" ? s.url + "?" + s.data : s.url),true); if (s.type == "POST") xhobj.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); xhobj.onreadystatechange = watching; xhobj.setRequestHeader("If-Modified-Since","0"); if (s.type == "POST") xhobj.send(s.data); else xhobj.send(null); timer = setTimeout(requestTimeout,s.outtime ? s.outtime : 9500); } this.doPost = function (jsonParas) {jsonParas.type = "POST";this.doAjax(jsonParas);} this.doGet= function (jsonParas) {jsonParas.type = "GET";this.doAjax(jsonParas);} function requestTimeout() { xhobj.abort(); xhobj = null; if (s.timeout) s.timeout(); else { s.success("服务器繁忙~ : ("); } } function watching() { if (xhobj.readyState < 4) { if (s.loading) {s.loading(); } } else if (xhobj.readyState >= 4) { if (s.complete) s.complete(xhobj.responseText); if (xhobj.status == 200) { if (s.success)s.success(xhobj.responseText,xhobj.status); } else { if (s.error)s.error(xhobj.status); else s.success("服务器错误!"+xhobj.status); } clearTimeout(timer); } } function createXmlHttp() { xhobj = false; try { xhobj = new ActiveXObject("Msxml2.XMLHTTP"); // iemsxml3.0+ } catch (e) { try { xhobj = new ActiveXObject("Microsoft.XMLHTTP"); //iemsxml2.6 } catch (e2) { xhobj = false; } } if (!xhobj && typeof XMLHttpRequest != 'undefined') {// Firefox,Opera 8.0+,Safari xhobj = new XMLHttpRequest(); } return xhobj; } function xmlHttp() { xmlHttp = false; xmlHttpObj = ["MSXML2.XMLHttp.5.0","MSXML2.XMLHttp.4.0","MSXML2.XMLHttp.3.0","MSXML2.XMLHttp","MSXML.XMLHttp"]; if (window.XMLHttpRequest) { xmlHttp = new XMLHttpRequest(); } else if (window.ActiveXObject) { for (i = 0; i < xmlHttpObj.length; i++) { xmlHttp = new ActiveXObject(xmlHttpObj[i]); if (xmlHttp) { break; } } } return xmlHttp ? xmlHttp : false; } } 原文链接：https://www.f2er.com/ajax/166678.html
