If you submit the form via JavaScript (i.e., formElement.submit() or anything equivalent), then none of the submit buttons are considered successful and none of their values are included in the submitted data. (Note that if you submit the form by using submitElement.click() then the submit that you had a reference to is considered active; this doesn't really fall under the remit of your question since here the submit button is unambiguous but I thought I'd include it for people who read the first part and wonder how to make a submit button successful via JavaScript form submission. Of course, the form's onsubmit handlers will still fire this way whereas they wouldn't via form.submit() so that's another kettle of fish...)

If the form is submitted by hitting Enter while in a non-textarea field, then it's actually down to the user agent to decide what it wants here. The specifications don't say anything about submitting a form using the Enter key while in a text entry field (if you tab to a button and activate it using space or whatever, then there's no problem as that specific submit button is unambiguously used). All it says is that a form must be submitted when a submit button is activated. It's not even a requirement that hitting Enter in e.g. a text input will submit the form.

我相信Internet Explorer会选择在源代码中首先出现的提交按钮;我有一种感觉，Firefox和Opera会选择标签索引最低的按钮，如果没有其他定义，就会退回到第一个定义的按钮。关于提交是否具有非默认值属性IIRC，也存在一些复杂性。

The point to take away is that there is no defined standard for what happens here and it's entirely at the whim of the browser - so as far as possible in whatever you're doing, try to avoid relying on any particular behaviour. If you really must know, you can probably find out the behaviour of the various browser versions, but when I investigated this a while back there were some quite convoluted conditions (which of course are subject to change with new browser versions) and I'd advise you to avoid it if possible!

从HTML 4规范:

如果一个表单包含多个提交按钮，只有激活 提交按钮成功。

这意味着如果有多个提交按钮且没有激活(单击)，则没有一个提交按钮会成功。

我认为这是有道理的:

想象一个有多个提交按钮的巨大表单。在顶部，有一个“删除这条记录”按钮，然后有很多输入，在底部有一个“更新这条记录”按钮。当用户在表单底部的字段中按Enter时，他/她永远不会怀疑他/她从顶部隐式地按下了“删除此记录”。

因此，我认为使用用户没有定义(点击)的第一个按钮或任何其他按钮都不是一个好主意。不过，浏览器当然也在这么做。

我的食谱:

<form>
    <input type=hidden name=action value=login> <!-- The magic! -->

    <input type=text name=email>
    <input type=text name=password>

    <input type=submit name=action value=login>
    <input type=submit name=action value="forgot password">
</form>

如果没有一个按钮被“单击”，它将发送默认隐藏字段。

如果单击其中一个，它具有优先级，其值将被传递。

奇怪的是，第一个按钮进入总是第一个按钮，无论是否可见，例如使用jQuery的show/hide()。添加属性。attr('disabled'， 'disabled')可以完全阻止接收输入提交按钮。这是一个问题，例如在调整记录对话框中的插入/编辑+删除按钮可见性时。我发现它不那么hackish和简单的将编辑放在插入前面:

<button type="submit" name="action" value="update">Update</button>
<button type="submit" name="action" value="insert">Insert</button>
<button type="submit" name="action" value="delete">Delete</button>

并使用JavaScript代码:

$("#formId button[type='submit'][name='action'][value!='insert']").hide().attr('disabled', 'disabled');
$("#formId button[type='submit'][name='action'][value='insert']").show().removeAttr('disabled');

我认为这篇文章会帮助如果有人想用jQuery:

http://greatwebguy.com/programming/dom/default-html-button-submit-on-enter-with-jquery/

基本解决方案是:

$(function() {
    $("form input").keypress(function (e) {
    if ((e.which && e.which == 13) || (e.keyCode && e.keyCode == 13)) {
        $('input[type=submit].default').click();
        return false;
    }
    else {
        return true;
    }
    });
});

另一个我喜欢的是:

jQuery(document).ready(function() {
    $("form input, form select").live('keypress', function (e) {
        if ($(this).parents('form').find('button[type=submit].default, input[type=submit].default').length <= 0)
            return true;

        if ((e.which && e.which == 13) || (e.keyCode && e.keyCode == 13)) {
            $(this).parents('form').find('button[type=submit].default, input[type=submit].default').click();
            return false;
        }
        else {
            return true;
        }
    });
});

要确定按enter键时按下了哪个按钮，可以用type="submit"标记它，其他按钮用type="button"标记它们。例如:

<input type="button" value="Cancel" />
<input type="submit" value="Submit" />

抱歉，当我写这个答案时，我想的是一般意义上的提交按钮。下面的答案不是关于多个type="submit"按钮，因为它只留下一个type="submit"，而把另一个改为type="button"。我把答案留在这里作为参考，以防帮助可以更改表单类型的人。