SyntaxError：JSON.parse：JSON数据的第3行第1列的意外字符

Question

所以即时通讯尝试通过JQuery Ajax调用返回DataTable到web服务，但不断收到错误，返回的JSON格式不正确。当我将字符串传递给验证器时，它说它很好，任何人都知道我会在哪里出错？ 我的代码如下：

var params = new Object(); 
     params.centreId = 0; 
     params.brcWeek = 0; 
     params.brcMonth = 0; 
     params.brcYear = 0; 
     params.weekOffSet = 0; 

     $.ajax({ 
      type: "POST", 
      contentType: "application/json; charset=utf-8", 
      url: "/Webservice/LloydsService/getLloydsOverview", 
      data: JSON.stringify(params), 
      dataType: "json", 
      success: function (data) { 
       console.debug("data received Ok?"); 
       console.log(data); 
      }, 
      error: function (jqXHR, textStatus, errorThrown) { 
       alert(textStatus + " -- " + "---" + errorThrown); 
      } 
     }); 

Web服务：

<WebMethod()> _ 
<ScriptMethod(ResponseFormat:=ResponseFormat.Json)> _ 
Public Function getLloydsOverview(ByVal centreId As Integer, ByVal brcWeek As Integer, ByVal brcMonth As Integer, ByVal brcYear As Integer, ByVal weekOffSet As Integer) As String 
    Dim dt As New DataTable() 
    Dim serializer As JavaScriptSerializer = New JavaScriptSerializer() 

    Using conn As SqlClient.SqlConnection = GetDBConnection() 
     Using cmd As SqlClient.SqlCommand = conn.CreateCommand 
      cmd.CommandType = CommandType.StoredProcedure 
      cmd.CommandText = "sp_LloydsDashboard_Overview" 
      cmd.Parameters.AddWithValue("@CentreId", centreId) 
      cmd.Parameters.AddWithValue("@BRCWeek", brcWeek) 
      cmd.Parameters.AddWithValue("@BRCMonth", brcMonth) 
      cmd.Parameters.AddWithValue("@BRCYear", brcYear) 
      cmd.Parameters.AddWithValue("@WeekOffSet", weekOffSet) 
      Using DA As New SqlDataAdapter(cmd) 
       conn.Open() 
       DA.Fill(dt) 
       Dim rows As New List(Of Dictionary(Of String, Object))() 
       Dim row As Dictionary(Of String, Object) 
       For Each dr As DataRow In dt.Rows 
        row = New Dictionary(Of String, Object)() 
        For Each col As DataColumn In dt.Columns 
         row.Add(col.ColumnName, dr(col)) 
        Next 
        rows.Add(row) 
       Next 
       Dim json As String = serializer.Serialize(rows) 
       Return json 
      End Using 
     End Using 
    End Using 
End Function 

返回这个（这验证）：

[{"WalkedPast":1000,"PeelOff":0.1,"WalkedIn":100}] 

，但我仍然得到错误语法错误：JSON.parse： JSON数据第3行第1列的意外字符。

任何任何想法？

Answer 1

不字符串化（假定params已经是JSON）

$.ajax({ 
      type: "POST", 
      contentType: "application/json; charset=utf-8", 
      url: "/Webservice/LloydsService/getLloydsOverview", 
      data: params, 
      dataType: "json", 
      success: function (data) { 
       console.debug("data received Ok?"); 
       console.log(data); 
      }, 
      error: function (jqXHR, textStatus, errorThrown) { 
       alert(textStatus + " -- " + "---" + errorThrown); 
      } 
     }); 

小提琴here，看看控制台。