試一試 - CSS Reference js

<!DOCTYPE html>
<html>
<head>
<style>
#myDIV {
   border: 15px solid transparent;
   padding: 15px;
   -webkit-border-image:url(border.png) 30 stretch; /* Safari 3.1-5 */
   -o-border-image:url(border.png) 30 stretch; /* Opera 11-12.1 */
   border-image:url(border.png) 30 stretch;
}
</style>
</head>
<body>

<p>Click the "Try it" button to change the border-image property of the DIV element:</p>

<button onclick="myFunction()">Try it</button>
<br><br>

<div id="myDIV">
  <h1>Hello</h1>
</div>

<p><b>Note:</b> Internet Explorer 10, and earlier versions, do not support the border-image property.</p>

<script>
function myFunction() {
   document.getElementById("myDIV").style.WebkitBorderImage = "url(border.png) 30 round"; /* Safari 3.1-5 */
   document.getElementById("myDIV").style.OBorderImage = "url(border.png) 30 round"; /* Opera 11-12.1 */
   document.getElementById("myDIV").style.borderImage = "url(border.png) 30 round";
}
</script>

</body>
</html>