原因 Additional Notes: Forms and their child elements should not use input names or ids that conflict with properties of a form, such as submit, length, or method. Name conflicts can cause confusing failures. For a complete list of rules and to check your markup for these problems, see DOMLint.
其他注意事项: 表单和其子元素不宜用一个表单的属性的属性作为name或id的名称,如submit, length, or method,是、会产生冲突。名称冲突可能会导致混乱的失败。对于一个完整的规则列表,并检查这些问题标记,看DOMLint。 所以将注册按钮的id改为“register”就OK了