if(mysql_num_rows($result)!=1){
echo "<script language='JavaScript'>";
echo "alert('用户不存在 !!')";
echo "</script>";
}
echo "<script language='JavaScript'>";
echo "alert('用户不存在 !!')";
echo "</script>";
}
==>
alert("你提示的内容提要要用引号或双引号包含")
<?
if(mysql_num_rows($result)!=1){
?>
<script language="JavaScript">;
alert("用户不存在 !!:");
</script>;
<?
}
?>
if(mysql_num_rows($result)!=1){
echo <<<EOF
<script language="JavaScript">
window.alert('用户不存在 !!');
</script>
EOF;
}