下面的例子可检测图形是否已完成加载 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <script>
    function alertComplete() {
      alert("图片加载完成: " + document.getElementById("compman").complete);
    }
  </script>
</head>

<body onload="alertComplete()">
  <img id="compman" src="/examples/compman.gif" alt="Computerman" width="107" height="98">

</body>
</html>
        