使用AJAX和XMLHttpRequest动态加载内容
下面的例子展示了你如何动态load内容。使用AJAX和XMLHttpRequest object.<!DOCTYPE html><html><head> <title>Dynamically loading content using AJAX and XMLHttpRequest</title> <style type="text/css"> blockquote { font-style: italic; text-align: justify; } </style></head><body> <button >Load <em>Lorem ipsum...</em></button> <button >Load invalid file</button> <blockquote id="output"></blockquote> <script type="text/javascript"> var xhr; const debug = document.getElementById("output"); function xhr_onReadyStateChangeHandler(evt) { var req = evt.currentTarget; // xhr switch (req.readyState) { case XMLHttpRequest.UNSENT: case 0: // do nothing break; case XMLHttpRequest.OPENED: case 1: // do nothing break; case XMLHttpRequest.HEADERS_RECEIVED: case 2: // do nothing break; case XMLHttpRequest.LOADING: case 3: // do nothing break; case XMLHttpRequest.DONE: case 4: if ((req.status === 200) || (req.status === 0)) { debug.innerHTML = req.responseText; } else { debug.innerHTML = "<h1>Unable to load text file: status=" + req.status + "</h1>"; } break; } } function init(uri) { xhr = new XMLHttpRequest(); xhr.onreadystatechange = xhr_onReadyStateChangeHandler; xhr.open("GET", uri); xhr.send(); } </script> </body></html>
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使用AJAX和XMLHttpRequest动态加载内容.zip
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