<script>alert('asdf');</script> 问题？？？？？？？？？？？？？？？？

自己比较一下这两个alert<script>
alert("test")
</script>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD><BODY>
<INPUT TYPE="text" NAME="" onkeyup="alert(ft())">
<script>
alert("test")
</script>
</BODY>
</HTML>