1,HTML source code£º
<![CDATA[
<html>
<head>
<title>How to use StringBuffer</title>
</head>
<body>
<script src="jsjava.js"></script>
<script>
var sb=new StringBuffer("Beijing");
document.write(sb+"<br>");
sb.append(" is");
document.write(sb+"<br>");
sb.append(" the capital of China");
document.write(sb+"<br>");
var des=sb.substringBetween(0,7);
document.write(des);
</script>
</body>
</html>
]]>
2,The display:
Beijing
Beijing is
Beijing is the capital of China
Beijing