javascript防止表单重复提交

<form action="/user/login.htm" onsubmit="return dosubmit()" method="post">

用户名：<input type="text" name="username"/>

密码：    <input name="pasword" type="password"/>

        <input type="submit" value="提交"/>

</form>

<script type="text/javascript">

var isSubmited=false; ////初始化提交状态

function dosubmit(){

if(isSubmited==false){

return true;

}else{

return false;

}

}

</script>