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表单提交后按钮即失效

<Script Language="JavasSript">  
<!--
function checkform() {
 test.submit.disabled=true;
 }
//-->
</Script>
<form action="1.asp" name="test" onsubmit="return checkform();">
<input type="submit" name="submit">
</form>

<form action="0.asp" onsubmit="this.sub.disabled=true;">  
<input type="submit" name="sub" value="send">  
</form>



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