ajax例子
var xmlHttp;/**XMLHttpRequest*/function createXMLHttpRequest(){ if(window.XMLHttpRequest) { xmlHttp = new XMLHttpRequest(); } else if (window.ActiveXObject) { xmlHttp = new ActiveXObject("Msxml2.XMLHTTP"); } else { xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); } }/**ajax 执行方法 传入要访问后台地址，该方法会将返回结果传给callback()方法*/function executeAjax(url){ createXMLHttpRequest(); xmlHttp.abort() ; xmlHttp.open("post",url,true); xmlHttp.onreadystatechange = function(){ if(xmlHttp.readyState==4){ if(xmlHttp.status==200) { callback(xmlHttp.responseText); } } }; xmlHttp.send(null);}function executeAjaxFun(url,fun){ createXMLHttpRequest(); xmlHttp.abort(); xmlHttp.open("post",url,true); xmlHttp.onreadystatechange = function(){ if(xmlHttp.readyState==4){ if(xmlHttp.status==200) { fun(xmlHttp.responseText); } } }; xmlHttp.send(null);}
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