//獲取賬號名
        var Name = document.getElementById("Text1").value;//獲取密碼
        var Pass = document.getElementById("Password1").value;
        //獲取真實姓名
        var Realname = document.getElementById("Text3").value;
        //獲取聯繫電話
        var Telphone = document.getElementById("Text4").value;
        //獲取用戶狀態
        var Status = 0;
        //判斷單選框是否選中
        var val = $("input:radio[name='qi']:checked").val();
        if (val == null) {
            alert("您沒有選擇狀態");
        }
        else {
            //創建一個類
            var userInfo = {
                Name: Name,
                Pass: Pass,
                Realname: Realname,
                Telphone: Telphone,
                Status: parseInt(val)
            }
            //調用方法
            $.ajax({
                url: "Api地址",
                type: "POST",
                //將類轉換為json字元串
                data: JSON.stringify(userInfo),
                dataType: "json",
                contentType: "application/json;charset=utf-8",
                success: function (data) {
                    if (data > 0) {
                        alert("添加成功");
                    }
                    else {
                        alert("添加失敗");
                    }
                }
            })
           
        }

 API後臺

//API代碼    
        [HttpPost]  
        public int Post([FromBody]UserInfo userInfo)
        {
           
            return bll.AddUser(userInfo);
        }

WebApi FromBody參數

查看 https://blog.csdn.net/bafnypeu/article/details/78262684