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<script language="javascript" onSubmit="return checkform();">
function checkform()
{
if(document.form88.xy.value.length <10)
{
alert("字符不够");
return false;
}
return true;
}
</script>
<form id="form88" name="form88" method="post" action="jyxy.asp?ac=ch" onSubmit="return checkform();" >
<input name="username" type="text" maxlength="30" id="username" value="<%=session("username")%>" />
<textarea name="xy" cols="110" rows="20" id="xy" ></textarea>
<input name="Submit3" type="submit" value="确定" ">
<input name="Submit22" type="reset" value="全部重填" />
<textarea id="test"></textarea>
<button id="btn">Btn</button>
<script>
function $(o){return document.getElementById(o)}
var min = 5; //最少5个字符
$('btn').onclick = function(){
if($('test').value.length < min){
alert('最少填写 '+min+' 个字符')
}
}
</script>