【分享】Ajax非同步請求JS代碼

//擷取請求對象var xmlhttp;var xmlDom;function makeRequest() {if (window.XMLHttpRequest) {xmlhttp = new XMLHttpRequest();} else {if (window.ActiveXObject) {xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");}}}//具體調用函數function getAjaxRequest(url) {makeRequest();xmlhttp.open("get", url, true);xmlhttp.onreadystatechange = callback;xmlhttp.setRequestHeader("Content-Type", "text/html;charset=UTF-8");xmlhttp.send(null);}//回呼函數function callback() {if (xmlhttp.readyState == 4) {if (xmlhttp.status == 200) {xmlDom = xmlhttp.responseXML;//請求成功後執行的JS方法}}}