小小代码留着有用【自己做项目学到得就是比老师交的映像深刻】

1.实现居中

在td标签中加入属性align="center"(这个是左右居中)valign="middle"(这个是上下居中)

例：

<table>

<tr><td align="center" valign="middle">图片文字居中现实代码</td></tr>

</table>

2.绝对定位

<style type="text/css">

#div3

{

position:absolute;

top:100px;

right:267px;

}

</style>

3.图片去边框

img

{

border:none;}

4.超链接去下滑线

a

{

text-decoration:none;

}

<a href="连接到得页">作业</a>

5.将盒子的边框显示出来

<div id="div2" style="border: 2px solid Red; width:211px; height:563px;">

设置盒子在指定的位置

<div id="hezi" style="border: 1px solid Red;width:800px; height:350px; text-align:center;margin-left:200px;position:relative;top:120px; " >

6.加*并使*变成红色

<span class ="w">*</span>

.w

{

color:Red ;

}

7、设置一个图片按钮

<asp:ImageButton ID="ImageButton1" runat="server" ImageUrl="~/images/zhanglan/zhuze.jpg" />

8.验证码

<td id ="d"><img id="yanzhengma" src="yanzhengma.aspx" onclick="this.src='yanzhengma.aspx?aaa='+new Date()" alt="" />

<a href="javascript:Verify();">看不清楚,换张图片 </a>

</td>

<script type="text/javascript" >

function Verify()

{

document.getElementById("yanzhengma").src = "yanzhengma.aspx?time=" + Math.random();

}

</script>

protected void Page_Load(object sender, EventArgs e)

{

System.Random r = new Random();

string s = Convert.ToString(r.Next(1000, 9999));//验证码数字

string path = Server.MapPath("~/images/zhanglan/1.jpg");

using (System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(path))

{

using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap))

{

g.DrawString(s, new System.Drawing.Font("宋体", 30), System.Drawing.Brushes.Red, 0, 0);

}

bitmap.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);

}

Session["index"] = s;

}

----------------------------------------------------

9.图片按钮转向另一个界面

protected void ImageButton2_Click(object sender, ImageClickEventArgs e)

{

Response.Redirect("~/Resiger.aspx");

}

<asp:ImageButton ID="ImageButton2" runat="server" ImageUrl="~/img/新用户注册.png"

onclick="ImageButton2_Click" />

设置属性：validationGroup

------------------------------------------------------------

10.验证文本框TextBox是否为空

1.使用工具箱控件 RequiredFieldValidator

2.设置属性ControToValidate 设置为你想验证的文本框

3.将验证字的颜色设置为红色 ,把ForeColor属性设置为red

-------------------------------------------------------------------------------

11.3秒后页面跳转

<meta http-equiv="Refresh" content="3;URL=http://www.163.com" />

<script type="text/javascript">

var the_timeout; the_timeout = setTimeout("Refresh();", 3000);

function Refresh() { window.location.href = "main.aspx"; }

</script>

----------------------------

12.实现默认情况为为本框（用户名/邮箱），当为本框为空光标移动到别的地方时仍显示（用户名/邮箱）

<script type="text/javascript">

function onfocus1() {

document.getElementById("Text1").value = "";

}

function onfocus2() {

if (document.getElementById("Text1").value =="") {

document.getElementById("Text1").value = "用户名/邮箱";

}

}

</script>

<input runat="server" id="Text1" type="text" value="用户名/邮箱" onfocus="onfocus1();"/>

<input runat="server" id="Text2" type="text" onfocus="onfocus2();"/>

-------------------------------------------

13.web.config里连接数据库

<?xml version="1.0" encoding="utf-8"?>

<!--

有关如何配置 ASP.NET 应用程序的详细消息，请访问

http://go.microsoft.com/fwlink/?LinkId=169433

-->

<configuration>

<system.web>

<compilation debug="true" targetFramework="4.0" />

</system.web>

<connectionStrings>

<add name="conStr" connectionString="data source=EJNSWJOZ0JSDS7J;Initial

Catalog=CSDNBoKe;User ID=sa;Password=111111; "/>

</connectionStrings>

</configuration>

混合身份登录：

Data Source=YHB-PC;Initial Catalog=MyTest;Persist Security Info=True;User

ID=sa;Password=yhb@163

windows登录：

Data Source=YHB-PC\SQLSERVER2008;database=csdnnews;integrated security=true

连接SQLExpress

Data Source=.\SQLEXPRESS;AttachDBFilename=|DataDirectory|\Database1.mdf;Integrated

Security=True;User Instance=True