HTML+JS---限制表单多次提交

限制表单多次提交：

表单只能提交一次

function check_form_data(){
    $("#once_submit").attr("disabled","disabled");
    $("#once_submit").css("background","#aaaaaa");
    $('#once_submit').val('提交中...');
    return true;

}
<form action="" method="post" onsubmit="return check_form_data()">
    <input type="submit" id="once_submit" value="确认">
</form>