This solution is rather crude, however, closely resembling the use of hidden form fields to pass along values between requests.
然而，这种解决方案有些简陋，很像使用隐藏的表单字段在请求之间传递值。
Some hidden fields are added at the top of the form.
在表单的顶部添加一些隐藏字段。
This subform adds four hidden fields to the form that is eventually submitted to the server.
此子表单将四个隐藏字段添加到最终提交给服务器的表单。
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