jquery ajax fails to pass array to background

At first I thought traditional:true was dispensable, but later when I didn’t use traditional, I found that the value of selectUsers could not be obtained in the background, so it is certain that the default value of traditional is false.

When the submitted parameter is an array ({selectUsers:[value,value,value]}),

If it is false, it will be submitted when Is "selectUsers[]=value&selectUsers[]=value"

##12ckee##m2[name]##m2[list][]y1z1o1

#name

nihao

##list[]

[3]

##0 x

y

z

o

zzzzz

[3

]##0

x1

##1

##2

m2[ckee]

If set to true, the submission will be "selectUsers=value&selectUsers=value"

##1##2ckeem2The explanation of the official document is as follows: traditional Type: Boolean

## name	nihao
##list	[3]
##0##x
y
z
o
[object+Object]	This way the background can use String[] ids=request.getParameterValues("selectUsers"); Get the value.

If you want to serialize data in the traditional way, then set it to true.

Set this to true if you wish to use the traditional style of param serialization

frontend js

 var obj2 = {
                "name": "nihao",
                "list": ["x", "y", "z"],
                "ckee": "o",
                "m2": {
                    "name": "zzzzz",
                    "list": ["x1", "y1", "z1"],
                    "ckee": "o1"
                }
            }

            $.ajax({
                type: "POST",
                url: "/Home/SubmitForm",
                data: obj2,
                dataType: "text",
                async: false,
                traditional: true,
                success: function (data) {
                    var rows = data.rows;

                }
            });
            $.ajax({
                type: "POST",
                url: "/Home/SubmitForm",
                data: obj2,
                dataType: "text",
                async: false,
                traditional: false,
                success: function (data) {
                    var rows = data.rows;

                }
            });

Backstage

        [HttpPost]
        public string SubmitForm(mymode request)
        {
            if (request != null)
            {
                // 
            }
            return "操作成功。";
        }

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