標籤：script htm 存在 load code text 調用 open var
回呼函數是一種以參數形式傳遞給另一個函數的函數。
如果您的網站上存在多個 AJAX 任務，那麼您應該為建立 XMLHttpRequest 對象編寫一個標準的函數，並為每個 AJAX 任務調用該函數。
<script>var xmlhttp;function loadXMLDoc(url,cfunc){if (window.XMLHttpRequest) {// IE7+, Firefox, Chrome, Opera, Safari 代碼 xmlhttp=new XMLHttpRequest(); }else {// IE6, IE5 代碼 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); }xmlhttp.onreadystatechange=cfunc;xmlhttp.open("GET",url,true);xmlhttp.send();}function myFunction(){ loadXMLDoc("/home/soyo/案頭/soyo.txt",function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { document.getElementById("myDiv").innerHTML=xmlhttp.responseText; } });}</script></head><body><div id="myDiv"><h2>使用 AJAX 修改常值內容</h2></div><button type="button" onclick="myFunction()">修改內容</button></body>
XMLHttpRequest 對象-回呼函數
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