零代码配置xml维护单表

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零代码配置xml维护单表

   小弟关注cnblogs有一段时间了，每天上班第一件事是打开博客园关注里面的最新博客(当然开会或其它特殊情况就例外了，哈哈)，这段时间工作不忙,刚刚申请开通了属于自己的blog，没想到cnblogs的管理员办事效率如此之高（真是令人倍感兴奋!），从提交申请到审核通过只等待了31分钟，在此先谢过啦。这是我的第一篇blog，希望各位帅哥美女不要扔太多砖头鸡蛋(小弟害怕太暴力哦!)，写得不好的地方，也希望大家多多批评指正，好了，废话不多说了，今天介绍自己的一个小作品，通过建立数据库表，简单配置xml，生成添加信息的页面，希望各位XDJM能从中有所收获.

   下面以一个简单的新闻管理应用介绍

第一步建立数据库表(数据库为sqlserver 2005)

T_NEWSTYPE(新闻类别)
ID(int 自动编号),NAME (varchar(50))

T_INFO(新闻)
ID(char(36)),TITLE(varchar(100)),CONTENT(varchar(max)),ADDTIME(smalldatetime),CLICKNUM(int),TYPE(varchar(10))

第二步建立数据表对应的xml文件

代码

<table id="99" key="id" name="T_NEWSTYPE" cnname="新闻类别" order="id desc">
    <column name="ID" cnname="编号" ftable="" fvalue="" ftext="" isfilter="n" visible="y" allownull="n" regex="" tip="" type=""></column>
    <column name="NAME" cnname="类别名称" ftable="" fvalue="" ftext="" isfilter="y" visible="y" allownull="n" regex="" tip="" type="textbox"></column>
  </table>
<table id="100" key="id" name="T_Info" cnname="新闻" order="addtime desc,id desc">
    <column name="ID" cnname="编号" ftable="" fvalue="" ftext="" isfilter="n" visible="y" allownull="n" regex="" tip="" type="key"></column>
    <column name="TITLE" cnname="标题" ftable="" fvalue="" ftext="" isfilter="y" visible="y" allownull="n" regex="" tip="" type="textbox"></column>
    <column name="file" cnname="附件" ftable="" fvalue="" ftext="" isfilter="n" visible="n" allownull="n" regex="" tip="" type="file"></column>
    <column name="TYPE" cnname="类别" ftable="T_NEWSTYPE" fvalue="ID" ftext="NAME" isfilter="n" visible="y" allownull="n" regex="" tip="" type="dropdownlist"></column>
    <column name="CONTENT" cnname="内容" ftable="" fvalue="" ftext="" isfilter="n" visible="n" allownull="n" regex="" tip="" type="fck"></column>
    <column name="ADDTIME" cnname="添加时间" ftable="" fvalue="" ftext="" isfilter="n" visible="y" allownull="n" regex="" tip="" type="autodatetime"></column>
  </table>

第三步将xml中表对应的id传到这个添加信息的页面,生成添加类别和添加新闻信息页面的效果如下

添加成功后，返回列表页面，如下图：(如果有需要，列表和编辑页面在后面的系列再介绍，如果有人看懂了设计的思路自己实现了，我就不献丑了)

点击查看链接，查看刚才添加的新闻，如下图：

以上是实现的效果图，添加功能的aspx页面源码如下：

代码

1 <%@ Page Language="C#" AutoEventWireup="true" CodeFile="commonAdd.aspx.cs" Inherits="webadmin_common_commonAdd" %>
2
3 <%@ Register Assembly="FredCK.FCKeditorV2" Namespace="FredCK.FCKeditorV2" TagPrefix="FCKeditorV2" %>
4
5 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
6
7 <html xmlns="http://www.w3.org/1999/xhtml" >
8 <head runat="server">
9     <title>无标题页</title>
10      <link href="../css/style.css" rel="stylesheet" type="text/css" />
11 </head>
12 <body>
13     <form id="form1" runat="server">
14       <table width="100%">
15   <tr>
16     <td class="sitemap"><span><img src="../images/home.jpg" /></span>您当前的位置：<asp:Literal ID="tableCnName" runat="server"></asp:Literal>管理</td>
17   </tr>
18 </table>
19         <asp:PlaceHolder ID="contentPlaceHolder" runat="server"></asp:PlaceHolder>
20     </form>
21 </body>
22 </html>

页面放了两个控件,ID为tableCnName的literal显示表的中文名字，ID为contentPlaceHolder的控件放置根据xml配置动态添加的控件

aspx.cs后台代码如下：

代码

  1 using System;
  2 using System.Data;
  3 using System.Configuration;
  4 using System.Collections;
  5 using System.Web;
  6 using System.Web.Security;
  7 using System.Web.UI;
  8 using System.Web.UI.WebControls;
  9 using System.Web.UI.WebControls.WebParts;
10 using System.Web.UI.HtmlControls;
11 using System.Data.SqlClient;
12
13 using System.Xml;
14 using Personal.Wgc.Diys.DBUtility;
15 using Personal.Wgc.Diys.WebTools;
16 using System.Collections.Generic;
17 using System.Text;
18 using System.Data.Common;
19 using Personal.Wgc.Diys.CommonDiyControls;
20 using Personal.Wgc.Diys.Dal;
21
22 public partial class webadmin_common_commonAdd : System.Web.UI.Page
23 {
24     private XmlDocument doc = new XmlDocument();
25     public webadmin_common_commonAdd()
26     {
27         doc.Load(Server.MapPath("http://www.cnblogs.com/app_data/config.xml"));
28     }
29     protected void Page_Load(object sender, EventArgs e)
30     {
31         //if (UserService.GetInstance().GetLoginedUserTicket() < 1)
32         //{
33         //    this.ClientScript.RegisterClientScriptBlock(GetType(), "", "top.location='../default.aspx'", true);
34         //    return;
35         //}
36         if (string.IsNullOrEmpty(Request.QueryString["id"]))
37         {
38             Response.Write("页面缺少生成参数,生成失败");
39             Response.End();
40         }
41         if (ViewState["columnList"] == null)
42         {
43             InitialXmlInfo();
44         }
45         BuildPage();
46     }
47     private void InitialXmlInfo()
48     {
49         List<T_COLUMN> columnList = new List<T_COLUMN>();
50         T_COLUMN column;
51         XmlNode node = doc.SelectSingleNode("/root/table[@id='"+Request.QueryString["id"]+"']");
52         if (node != null)
53         {
54             if (node.ChildNodes.Count == 0)
55             {
56                 Response.Write("表配置不正确,页面生成失败!");
57                 Response.End();
58             }
59             tableCnName.Text = node.Attributes["cnname"].Value;
60             foreach (XmlNode columnNode in node.ChildNodes)
61             {
62                 column = new T_COLUMN();
63                 column.AllowNull = columnNode.Attributes["allownull"].Value.ToString().ToUpper() == "Y" ? true : false;
64                 column.CnName = columnNode.Attributes["cnname"].Value;
65                 column.FTable = columnNode.Attributes["ftable"].Value;
66                 column.FText = columnNode.Attributes["ftext"].Value;
67                 column.FValue = columnNode.Attributes["fvalue"].Value;
68                 column.IsFilter = columnNode.Attributes["isfilter"].Value.ToString().ToUpper() == "Y" ? true : false;
69                 column.Key = node.Attributes["key"].Value;
70                 column.Name = columnNode.Attributes["name"].Value;
71                 column.Regex = columnNode.Attributes["regex"].Value;
72                 column.TableName = node.Attributes["name"].Value;
73                 column.Type = columnNode.Attributes["type"].Value;
74                 column.Visible = columnNode.Attributes["visible"].Value.ToString().ToUpper() == "Y" ? true : false;
75                 column.Tip = columnNode.Attributes["tip"].Value;
76                 columnList.Add(column);
77             }
78             ViewState["columnList"] = columnList;
79         }
80         else
81         {
82             Response.Write("不存在此节点");
83             Response.End();
84         }
85     }
86     private void BuildPage()
87     {
88         Table myTable = new Table();
89         myTable.Attributes.Add("cellpadding", "4");
90         myTable.Attributes.Add("cellspacing", "1");
91         myTable.Style.Add(HtmlTextWriterStyle.Width, "100%");
92         if (ViewState["columnList"] == null)
93         {
94             InitialXmlInfo();
95         }
96         List<T_COLUMN> columnList = (List<T_COLUMN>)ViewState["columnList"];
97         foreach (T_COLUMN column in columnList)
98         {
99             TableRow tr = new TableRow();
100             tr.Style.Add(HtmlTextWriterStyle.BackgroundColor, "white");
101             tr.Style.Add(HtmlTextWriterStyle.Height, "30px");
102             tr.Style.Add(HtmlTextWriterStyle.Padding, "5");
103             tr.Style.Add(HtmlTextWriterStyle.FontSize, "14px");
104             TableCell tc = new TableCell();
105             tc.Text = column.CnName;
106             tr.Cells.Add(tc);
107             tc = new TableCell();
108             if (column.Type.ToLower() == "textbox")
109             {
110                 TextBox tb = new TextBox();
111                 tb.ID = column.Name;
112                 tb.ToolTip = column.Tip;
113                 tb.Style.Add(HtmlTextWriterStyle.Width, "400px");
114                 tc.Controls.Add(tb);
115                 if (!column.AllowNull)
116                 {
117                     Literal msg = new Literal();
118                     msg.Text = "<font color=\"red\">*</font>";
119                     tc.Controls.Add(msg);
120                     RequiredFieldValidator rfv = new RequiredFieldValidator();
121                     rfv.ControlToValidate = column.Name;
122                     rfv.ErrorMessage = "请填写";
123                     tc.Controls.Add(rfv);
124                 }
125                 if (!string.IsNullOrEmpty(column.Regex.Trim()))
126                 {
127                     RegularExpressionValidator rev = new RegularExpressionValidator();
128                     rev.ControlToValidate = column.Name;
129                     rev.ErrorMessage = "格式错误!";
130                     rev.ValidationExpression = column.Regex;
131                     tc.Controls.Add(rev);
132                 }
133                 tr.Cells.Add(tc);
134             }
135             else if (column.Type.ToLower() == "mtextbox")
136             {
137                 TextBox tb = new TextBox();
138                 tb.ID = column.Name;
139                 tb.TextMode = TextBoxMode.MultiLine;
140                 tb.ToolTip = column.Tip;
141                 tb.Style.Add(HtmlTextWriterStyle.Width, "90%");
142                 tb.Style.Add(HtmlTextWriterStyle.Height, "30px");
143                 tc.Controls.Add(tb);
144                 if (!column.AllowNull)
145                 {
146                     Literal msg = new Literal();
147                     msg.Text = "<font color=\"red\">*</font>";
148                     tc.Controls.Add(msg);
149                     RequiredFieldValidator rfv = new RequiredFieldValidator();
150                     rfv.ControlToValidate = column.Name;
151                     rfv.ErrorMessage = "请填写";
152                     tc.Controls.Add(rfv);
153                 }
154                 tr.Cells.Add(tc);
155             }
156             else if (column.Type.ToLower() == "timetextbox")
157             {
158
159                 Personal.Wgc.Diys.CommonDiyControls.DatePicker.DropDownDatePicker tb = new Personal.Wgc.Diys.CommonDiyControls.DatePicker.DropDownDatePicker();
160                 tb.Style.Add(HtmlTextWriterStyle.Width, "200px");
161                 tb.ID = column.Name;
162                 tc.Controls.Add(tb);
163                 tr.Controls.Add(tc);
164             }
165             else if (column.Type.ToLower() == "numbertextbox")
166             {
167                 Personal.Wgc.Diys.CommonDiyControls.DiyTextBox.NumberTextBox tb = new Personal.Wgc.Diys.CommonDiyControls.DiyTextBox.NumberTextBox();
168                 tb.Style.Add(HtmlTextWriterStyle.Width, "200px");
169                 tb.ID = column.Name;
170                 tb.ToolTip = column.Tip;
171                 tc.Controls.Add(tb);
172                 if (!column.AllowNull)
173                 {
174                     Literal msg = new Literal();
175                     msg.Text = "<font color=\"red\">*</font>";
176                     tc.Controls.Add(msg);
177                     RequiredFieldValidator rfv = new RequiredFieldValidator();
178                     rfv.ControlToValidate = column.Name;
179                     rfv.ErrorMessage = "请填写";
180                     tc.Controls.Add(rfv);
181                 }
182                 tr.Controls.Add(tc);
183             }
184             else if (column.Type.ToLower() == "maxlengthtextbox")
185             {
186                 Personal.Wgc.Diys.CommonDiyControls.DiyTextBox.MaxLengthTextBox tb = new Personal.Wgc.Diys.CommonDiyControls.DiyTextBox.MaxLengthTextBox();
187                 tb.ID = column.Name;
188                 if (column.FText == "1")
189                 {
190                     tb.TextMode = TextBoxMode.MultiLine;
191                     tb.Style.Add(HtmlTextWriterStyle.Width, "80%");
192                     tb.Style.Add(HtmlTextWriterStyle.Height, "50px");
193                     if (!string.IsNullOrEmpty(column.FValue))
194                     {
195                         tb.Length = int.Parse(column.FValue);
196                     }
197                 }
198                 else
199                 {
200                     tb.Style.Add(HtmlTextWriterStyle.Width, "400px");
201                     if (!string.IsNullOrEmpty(column.FValue))
202                     {
203                         tb.MaxLength = int.Parse(column.FValue);
204                     }
205                 }
206                 tc.Controls.Add(tb);
207                 if (!column.AllowNull)
208                 {
209                     Literal msg = new Literal();
210                     msg.Text = "<font color=\"red\">*</font>";
211                     tc.Controls.Add(msg);
212                     RequiredFieldValidator rfv = new RequiredFieldValidator();
213                     rfv.ControlToValidate = column.Name;
214                     rfv.ErrorMessage = "请填写";
215                     tc.Controls.Add(rfv);
216                 }
217                 tr.Cells.Add(tc);
218             }
219             else if (column.Type.ToLower() == "autodatetime")
220             {
221                 TextBox tb = new TextBox();
222                 tb.Style.Add(HtmlTextWriterStyle.Width, "200px");
223                 tb.Text = DateTime.Now.ToString();
224                 tb.Enabled = false;
225                 tb.ID = column.Name;
226                 tb.ToolTip = column.Tip;
227                 tc.Controls.Add(tb);
228                 tr.Cells.Add(tc);
229             }
230             else if (column.Type.ToLower() == "fck")
231             {
232                 FredCK.FCKeditorV2.FCKeditor fckEditor = new FredCK.FCKeditorV2.FCKeditor();
233                 fckEditor.ID = column.Name;
234                 fckEditor.Width = new Unit(800);
235                 fckEditor.Height = new Unit(400);
236                 tc.Controls.Add(fckEditor);
237                 tr.Cells.Add(tc);
238             }
239             else if (column.Type.ToLower() == "dropdownlist")
240             {
241                 DropDownList ddl = new DropDownList();
242                 ddl.ID = column.Name;
243                 SQLData sqldata = new SQLData();
244                 sqldata.SqlString = "select * from " + column.FTable + "";
245                 SqlDataReader dr = SqlHelper.ExecuteReader(SqlHelper.ConnString, sqldata);
246                 while (dr.Read())
247                 {
248                     ddl.Items.Add(new ListItem(dr[column.FText].ToString(), dr[column.FValue].ToString()));
249                 }
250                 dr.Close();
251                 tc.Controls.Add(ddl);
252                 tr.Cells.Add(tc);
253             }
254             else if (column.Type.ToLower() == "key")
255             {
256                 tc.Text = string.Empty;
257                 tr.Cells.Add(tc);
258             }
259             else if (string.IsNullOrEmpty(column.Type.Trim()))
260             {
261                 tc.Text = string.Empty;
262                 tr.Cells.Add(tc);
263             }
264             else if (column.Type.ToLower() == "file")
265             {
266                 this.ClientScript.RegisterClientScriptInclude("jquery","http://www.cnblogs.com/js/jquery.js");
267                 this.ClientScript.RegisterClientScriptInclude("moreFile","http://www.cnblogs.com/js/addmorefile.js");
268                 FileUpload file = new FileUpload();
269                 file.ID = column.Name;
270                 HtmlInputButton inputButton = new HtmlInputButton();
271                 inputButton.Attributes.Add("onclick", "addFile()");
272                 inputButton.Attributes.Add("value", "更多附件");
273                 tc.Controls.Add(file);
274                 tc.Controls.Add(inputButton);
275                 HtmlGenericControl span = new HtmlGenericControl("span");
276                 span.ID = "moreFile";
277                 span.Style.Add("margin-top", "0px");
278                 tc.Controls.Add(span);
279                 tr.Controls.Add(tc);
280             }
281             if (column.Type.ToLower() == "key" || string.IsNullOrEmpty(column.Type.Trim()))
282             {
283                 //如果是主键,或自动增加列
284                 // donothing
285             }
286             else
287             {
288                 myTable.Rows.Add(tr);
289             }
290         }
291         TableRow trOperation = new TableRow();
292         TableCell tcOperation = new TableCell();
293         tcOperation.Text = string.Empty;
294         tcOperation.Style.Add(HtmlTextWriterStyle.BackgroundColor, "white");
295         trOperation.Cells.Add(tcOperation);
296         tcOperation = new TableCell();
297         tcOperation.Style.Add(HtmlTextWriterStyle.BackgroundColor, "white");
298         Button buttonSave = new Button();
299         buttonSave.Text = "保存";
300         buttonSave.Click+=new EventHandler(buttonSave_Click);
301         Literal backButton = new Literal();
302         backButton.Text = " <input type=\"button\" value=\"返回\" onclick=\"location='commonquery.aspx?id=" + Request.QueryString["id"] + "'\"/>";
303         tcOperation.Controls.Add(buttonSave);
304         tcOperation.Controls.Add(backButton);
305         trOperation.Controls.Add(tcOperation);
306         myTable.Rows.Add(trOperation);
307         contentPlaceHolder.Controls.Add(myTable);
308     }
309     protected void buttonSave_Click(object sender, EventArgs e)
310     {
311         //添加附件用的关联编号
312         string id = Guid.NewGuid().ToString();
313         //处理附件用
314         List<Personal.Wgc.Diys.Model.T_DATA> fileList = new List<Personal.Wgc.Diys.Model.T_DATA>();
315
316         List<T_COLUMN> columnList = (List<T_COLUMN>)ViewState["columnList"];
317
318         if (columnList.Count > 0)
319         {
320             List<DbParameter> sqlParameterList = new List<DbParameter>();
321             StringBuilder sql = new StringBuilder();
322             StringBuilder paras = new StringBuilder();
323             paras.Append("values (");
324             sql.Append("insert into ");
325             sql.Append(columnList[0].TableName);
326             sql.Append("(");
327             foreach (T_COLUMN column in columnList)
328             {
329                 //如果不是自增长列
330                 if (!string.IsNullOrEmpty(column.Type.Trim()))
331                 {
332                     //如果不是附件
333                     if (column.Type.ToLower() != "file")
334                     {
335                         sql.Append(column.Name);
336                         sql.Append(",");
337                         paras.Append("@");
338                         paras.Append(column.Name);
339                         paras.Append(",");
340                     }
341                     else
342                     {
343                      //含有附件
344                         Personal.Wgc.Diys.Model.T_DATA file;
345                         for (int i = 0; i < Request.Files.Count; i++)
346                         {
347                             //如果附件不为空
348                             if (!string.IsNullOrEmpty(Request.Files[i].FileName))
349                             {
350                                 file = new Personal.Wgc.Diys.Model.T_DATA();
351                                 file.ID = Guid.NewGuid().ToString();
352                                 file.LINKID = id;
353                                 file.NAME = Request.Files[i].FileName.Substring(Request.Files[i].FileName.LastIndexOf("\\") + 1);
354                                 file.SUFFIX = Request.Files[i].FileName.Substring(Request.Files[i].FileName.LastIndexOf('.') + 1).ToLower();
355                                 byte[] fileContent = new byte[Request.Files[i].ContentLength];
356                                 Request.Files[i].InputStream.Read(fileContent, 0, fileContent.Length);
357                                 file.CONTENT = fileContent;
358                                 fileList.Add(file);
359                             }
360                         }
361                     }
362                 }
363                 //-------------------parameters deal
364                 if (column.Type.ToLower() == "textbox" || column.Type.ToLower() == "mtextbox" || column.Type.ToLower() == "numbertextbox" || column.Type.ToLower() == "moneytextbox" || column.Type.ToLower() == "maxlengthtextbox" || column.Type.ToLower() == "autodatetime")
365                 {
366                     TextBox tb = this.FindControl(column.Name) as TextBox;
367                     if (tb != null)
368                     {
369                         sqlParameterList.Add(new SqlParameter("@" + column.Name, WebUtility.CleanString(tb.Text.Trim())));
370                     }
371                 }
372                 else if (column.Type.ToLower() == "dropdownlist")
373                 {
374                     DropDownList ddl = this.FindControl(column.Name) as DropDownList;
375                     if (ddl != null)
376                     {
377                         sqlParameterList.Add(new SqlParameter("@" + column.Name, ddl.SelectedValue));
378                     }
379                 }
380                 else if (column.Type.ToLower() == "fck")
381                 {
382                     FredCK.FCKeditorV2.FCKeditor fck = this.FindControl(column.Name) as FredCK.FCKeditorV2.FCKeditor;
383                     if (fck != null)
384                     {
385                         sqlParameterList.Add(new SqlParameter("@" + column.Name,WebUtility.CleanString(fck.Value)));
386                     }
387                 }
388                 else if (column.Type.ToLower() == "timetextbox")
389                 {
390                     TextBox tb = this.FindControl(column.Name) as TextBox;
391                     if (tb != null)
392                     {
393                         sqlParameterList.Add(new SqlParameter("@" + column.Name, WebUtility.CleanString(tb.Text.Trim())));
394                     }
395                 }
396                 else if (column.Type.ToLower() == "key")
397                 {
398                     sqlParameterList.Add(new SqlParameter("@" + column.Name, id));
399                 }
400                 else
401                 {
402                     //暂时默认为自动增长列
403                 }
404             }
405             sql.Remove(sql.Length - 1, 1);
406             sql.Append(")");
407             paras.Remove(paras.Length - 1, 1);
408             paras.Append(")");
409             SQLData sqldata = new SQLData();
410             sqldata.SqlString = sql.ToString() + paras.ToString();
411             sqldata.SqlParameter = sqlParameterList;
412             try
413             {
414                 if (SqlHelper.ExecuteNonQuery(SqlHelper.ConnString, sqldata) > 0)
415                 {
416                     //如果有附件
417                     if (fileList.Count > 0)
418                     {
419                         List<SQLData> sqldataList = new List<SQLData>();
420                         foreach (Personal.Wgc.Diys.Model.T_DATA item in fileList)
421                         {
422                             if (item.SUFFIX != "exe" && item.SUFFIX != "jar" && item.SUFFIX != "dll")
423                             {
424                                 sqldata = new SQLData();
425                                 sqldata.SqlString = "insert into t_data(id,linkid,suffix,name,content) values(@id,@linkid,@suffix,@name,@content)";
426                                 sqldata.SqlParameter.Add(new SqlParameter("@id", item.ID));
427                                 sqldata.SqlParameter.Add(new SqlParameter("@linkid",id));
428                                 sqldata.SqlParameter.Add(new SqlParameter("@suffix",item.SUFFIX));
429                                 sqldata.SqlParameter.Add(new SqlParameter("@name", item.NAME));
430                                 sqldata.SqlParameter.Add(new SqlParameter("@content", item.CONTENT));
431                                 sqldataList.Add(sqldata);
432                             }
433                         }
434                         if (sqldataList.Count > 0)
435                         {
436                             try
437                             {
438                                 SqlHelper.ExecuteNonQuery(SqlHelper.ConnString, sqldataList);
439                             }
440                             catch
441                             {
442                              // do nothing
443                             }
444                         }
445                     }
446                     this.ClientScript.RegisterClientScriptBlock(GetType(), "add", "alert('添加成功');location='commonquery.aspx?id=" + Request.QueryString["id"] + "'", true);
447                 }
448                 else
449                 {
450                     this.ClientScript.RegisterClientScriptBlock(GetType(), "add", "alert('添加失败')", true);
451                 }
452             }
453             catch
454             {
455                 this.ClientScript.RegisterClientScriptBlock(GetType(), "add", "alert('出现异常操作失败')", true);
456             }
457         }
458     }
459 }
460

本来想再介绍下代码和xml，只怪电脑性能太低，iexplorer.exe进程已经占了350M内存，再在编辑器中多输入一字都要卡半天，可惜啊可惜，看来干么事第一次都是很失败啊我。。希望各位XDJM有兴趣的直接看xml和代码自己领悟吧。。偶闪人了。。。

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原文地址：https://www.cnblogs.com/leonwang/p/1653276.html