获取XmlHttpRequest对象

复制代码 代码如下:

//1

function getXMLHttpRequest() {

var xmlHttpReq;

try { // Firefox, Opera 8.0+, Safari

xmlHttpReq = new XMLHttpRequest();

} catch (e) {

try {// Internet Explorer

xmlHttpReq = new ActiveXObject("Msxml2.XMLHTTP");

} catch (e) {

try {

xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");

} catch (e) {

}

}

}

return xmlHttpReq;

}

//2

function getXMLHttpRequest() {

var xmlHttpReq = null;

if (window.ActiveXObject) {// Internet Explorer

xmlHttpReq = new ActiveXObject("MSXML2.XMLHTTP.3.0");

} else if (window.XMLHttpRequest) {

xmlHttpReq = new XMLHttpRequest();

}

return xmlHttpReq;

}

//3

function getXMLHttpRequest() {

var xmlHttpReq = null;

if (window.XMLHttpRequest) {// Mozilla Firefox, Opera 8.0+, Safari

xmlHttpReq = new XMLHttpRequest();

} else {

if (window.ActiveXObject) {// Internet Explorer

try {

xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");

} catch (e) {

try {// Internet Explorer

xmlHttpReq = new ActiveXObject("Msxml2.XMLHTTP");

} catch (e) {

}

}

}

}

return xmlHttpReq;

}