因为

后台接收方法:

@RequestMapping(value="/edit")
     public ModelAndView edit(AppMenu model){
}

提交数据时候会报出下面的错误:

HTTP Status 400 -
type Status report
message
description The request sent by the client was syntactically incorrect.
Apache Tomcat/8.5.6

解决办法:

给该option加上value属性:

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