Form ​

• <VFormItem /> 不是泛型组件。
• validator() 给出空字符串 '' 对表单本身视为校验失败，调用方若需校验错误信息，建议做相同判断。
• HTML 标准规定 <form /> 元素不能嵌套（可以用（ <Teleport to="body" /> ）拆分）
• HTML <form /> 元素不会提交 disabled 的控件（react-hook-form 也是这么处理的），但在 strawberry-farm 里裁剪的只是 visible: false。如果用 readonly 替代 disabled，诸如 <select> [type="radio"] [type="checkbox"] 反而不支持这个 readonly 属性，真是鸡肋。
• 取决于自定义控件，可支持 Enter 向上查找表单并发起提交，因为这是 HTML <form /> 的默认行为。这部分因使用场景而异，存在争议。比如安卓输入法的回车的提示文本和行为很多都是“下一项”。<VListbox /> 及衍生组件暂不支持Enter提交，Enter的行为是选择。

太长不看: 添加 submit 按钮即可支持隐式提交表单,即支持回车键提交

4.10.21.2 Implicit submission A form element's default button is the first submit button in tree order whose form owner is that form element.

If the user agent supports letting the user submit a form implicitly (for example, on some platforms hitting the "enter" key while a text control is focused implicitly submits the form), then doing so for a form, whose default button has activation behavior and is not disabled, must cause the user agent to fire a click event at that default button.

There are pages on the web that are only usable if there is a way to implicitly submit forms, so user agents are strongly encouraged to support this.

If the form has no submit button, then the implicit submission mechanism must do nothing if the form has more than one field that blocks implicit submission, and must submit the form element from the form element itself otherwise.

For the purpose of the previous paragraph, an element is a field that blocks implicit submission of a form element if it is an input element whose form owner is that form element and whose type attribute is in one of the following states: Text, Search, URL, Telephone, Email, Password, Date, Month, Week, Time, Local Date and Time, Number

HTML Spec form-control-infrastructure.implicit-submission

The Enter Key should Submit Forms, Stop Suppressing it

W3C 标准中有如下规定：

When there is only one single-line text input field in a form, the user agent should accept Enter in that field as a request to submit the form.

即：当一个 form 元素中只有一个输入框时，在该输入框中按下回车应提交该表单。如果希望阻止这一默认行为，可以在 el-form 标签上添加 @submit.native.prevent。

https://element-plus.org/#/zh-CN/component/form