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<head>
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</head>
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function check(){
if (document.all.userName.value == ""){
alert("¶Ô²»Æ𣬵ǼÕʺŲ»ÄÜΪ¿Õ!");
return false;
}
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return false;
}
return true;
}
</script>
<body>
<h2>Óû§µÇ¼</h2>
<hr>
<form name="form1" method="post" action="chkuser.jsp" onSubmit="return check()">
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