struts页面用javascript来实现使按钮的变灰

<html:form action="12.do" method="post">
<html:button property="bb" οnclick="test();">退出</html:button>
</html:form>

<script language="javascript" type="text/javascript">
function test()
{   
 document.forms[0].bb.disabled   =   true   ;   
}
</script>

 按下这个按钮,他自己就变成灰色且不可点的了

 

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