javascript简化代码 A=alert w=document.writeln

 a=alert;w=document.writeln  
<script> A=alert,w=document.writeln w('<center>'+'Hello Well You!'.fontcolor('red')+'</center>') A('A is short for alert') </script>
[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]