<script language="JavaScript" type="text/javascript">
function check(aaa)
{
if(aaa.text1.value =="")
{
alert("文本框不能为空!");
return false;
}
else return true;
}
</script>
<form action="#" method="get" name="myform" target="_blank" onsubmit="return check(this)">
<input type="text" value="" name="text1" id="text1" />
<input type="submit" value="确定"/>
</form>
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