实现自己的Ajax对象封装器 -- Kajax --第一版完成

第一版 浏览: http://www.iamsese.cn/static/forwardAction.php?action=Kajax

/** * Kajax 是自定义的 Ajax封装器 */function Kajax(){this.XMLHttp = this.getXMLHttpObject();}Kajax.prototype.getXMLHttpObject = function() {//define a bool paramter to check IE instancevar xmlhttp = false ;//check client brower is IEtry {    // If javascript is greater than 5    xmlhttp = new ActiveXObject("MSXML2.XMLHTTP");    //alert("You are using Microsoft Internet Explorer .");}catch (e){    //else will use ActiveXObject older version    try {        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");        //alert("You are using old Microsoft Internet Explorer .");    }    catch (e){         //using brower is no IE.         xmlhttp = false ;    }}if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {try {    xmlhttp = new XMLHttpRequest();    //alert("You are not using Microsoft Internet Explorer .");}catch(e){xmlhttp = false ;}}return xmlhttp ;}Kajax.prototype.get = function (url,isAsyc){var outstring = '' ;if (isAsyc==undefined) isAsyc=false ;if (this.XMLHttp) {this.XMLHttp.open("GET",url,isAsyc);var oThis = this.XMLHttp ; //这里复制oThis变量的作用是 不与onreadystatechange函数中的this域冲突this.XMLHttp.onreadystatechange = function(){if (oThis.readyState == 4 && oThis.status == 200 )outstring += oThis.responseText ;}this.XMLHttp.send(null) ;}return outstring ;}/** * 同步获取一个JS文件,并执行 * @param {} url */Kajax.prototype.getJS = function (url){eval(this.get(url));}

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