增加代码API注释文档，整理代码

Scripts/UI/Internal/JsonDataSupport.cs

@@ -3,11 +3,18 @@ using System;
 
 namespace XCharts
 {
+    /// <summary>
+    /// 支持从json格式的字符串中导入数据
+    /// </summary>
     public class JsonDataSupport : IJsonData, ISerializationCallbackReceiver
     {
         [SerializeField] protected string m_JsonData;
         [SerializeField] protected bool m_DataFromJson;
 
+        /// <summary>
+        /// json格式的字符串数据
+        /// </summary>
+        /// <returns></returns>
         public string jsonData { get { return m_JsonData; } set { m_JsonData = value; ParseJsonData(value); } }
 
         public void OnAfterDeserialize()