Encapsulation of JavaScript XHR objects (cross-browser)

Loading documents:

/*@desc 加载XHR文件@author lee [<[email protected]>]@param file 文件路径@param async 同步或异步 true 异步 flase 同步@return xmlDoc 加载后的内容*/function loadDoc(file,async=true){if(window.XMLHttpRequest){  // code for IE7+, Firefox, Chrome, Opera, Safari    xmlhttp=new XMLHttpRequest();}else{  // code for IE6, IE5    xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");}xmlhttp.open("GET",file,async);xmlhttp.send();xmlDoc=xmlhttp.responseXML;return xmlDoc}

Load string:

/*@desc 加载XML文档@author lee [<[email protected]>]@param txt 字符串@param async 同步或异步 true 同步 flase 异步@return xmlDoc 加载后的DOM对象*/function loadStr(txt,async=true){if(window.DOMParser){    parser=new DOMParser();    xmlDoc=parser.parseFromString(txt,"text/xml");}else{  // Internet Explorer    xmlDoc=new ActiveXObject("Microsoft.XMLDOM");    xmlDoc.async=async;    xmlDoc.loadXML(txt);}return xmlDoc}

Encapsulation of JavaScript XHR objects (cross-browser)