JS案例：输入一个字符串，然后反向输出到页面上
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<!doctype html> <html> <head> <meta charset="utf-8"> <title>字符串对象案例测试</title> </head> <body>
<script type="text/javascript">
var origin_s,upper_s,i;
origin_s = prompt("请输入一个字符串:","");
upper_s = origin_s.toUpperCase();
for(i=upper_s.length-1;i>=0;i--){
document.write(upper_s.charAt(i));
}
</script>
</body> </html>
