原因
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 标签上添加 @submit.native.prevent。
解决
<el-form @submit.native.prevent></el-form>