ajax — getXMLHttpRequest
function getXMLHttpRequest() {var xmlHttp;try {// Firefox, Opera 8.0+, SafarixmlHttp = new XMLHttpRequest();}catch (e) {// Internet Explorertry {//Internet Explorer 6.0+xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");}catch (e) {try {//Internet Explorer 5.5+xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");}catch (e) {alert("您的浏览器不支持AJAX！");xmlHttp = false;}}}return xmlHttp;}
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