xugang 记录一个.NET 程序员的成长 关于页面逐步呈现的总结

<% @ Page Language = " C# " AutoEventWireup = " true " CodeBehind = " flush让页面分块逐步呈现.aspx.cs " Inherits = " Web_1.flush让页面分块逐步呈现 " %>
<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
< html xmlns ="http://www.w3.org/1999/xhtml" >
< head runat ="server" >
< title > flush让页面分块逐步呈现 </ title >
</ head >
< body >
< div id ="head" style ="border:1px solid #ccc;" >
cnblogs logo < img src ="http://images.cnblogs.com/logo_small.gif" alt ="" />
</ div >
<%
// flush分块输出
Response.BufferOutput = false ;
Response.Flush();
// Response.Output.Flush();
%>
< br /> 3 秒后加载下面内容...

< div id ="content" style ="border:1px solid blue;" >
<%
// 睡眠3秒
System.Threading.Thread.Sleep( 3000 );
%>
csdn logo < img src ="http://csdnimg.cn/www/images/csdnindex_piclogo.gif" alt ="" />
</ div >
</ body >
</ html >

<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
< html xmlns ="http://www.w3.org/1999/xhtml" >
< head >
< meta http-equiv ="Content-Type" content ="text/html; charset=UTF-8" />
< title >flush让页面分块逐步呈现 </ title >
</ head >
< body >
< div id ="head" style ="border:1px solid #ccc;" >
cnblogs logo < br />
< img src ="http://images.cnblogs.com/logo_small.gif" />
</ div >
<%
out.flush(); // flush response，分块输出
%>
< br />
< div id ="content" style ="border:1px solid blue;" >
<%
// 睡眠3秒
Thread.currentThread().sleep( 3000 );
%>
csdn logo < br />
< img src ="http://csdnimg.cn/www/images/csdnindex_piclogo.gif" />
</ div >
</ body >
</ html >

<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
< html xmlns ="http://www.w3.org/1999/xhtml" >
< head >
< meta http-equiv ="Content-Type" content ="text/html; charset=UTF-8" />
< script type ="text/javascript" src ="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js" ></ script >
</ head >
< body >
一开始能看到的图片：
< img src ="http://at-img4.tdimg.com/board/2010/5/tylc-115X55.jpg" />

< div id ="lazyBox" style ="margin-top:100px;" >
一开始看不到下面的图片，滚动鼠标后可以看见：
< img width ="120" height ="90" style ="border:1px solid blue;" class ="lazyImg" alt ="http://i01.img.tudou.com/data/imgs/i/051/871/396/m20.jpg" src ="http://css.tudouui.com/skin/__g/img/sprite.gif" coords ="_DBA" />
</ div >

< div style ="height:1000px;" ></ div >

< script type ="text/javascript" >
var hasShow = false ;
$(window).bind( " scroll " , function (){
if (hasShow == true ){
$(window).unbind( " scroll " );
return ;
}
var t = $(document).scrollTop();
if (t > 50 ){
// 滚动高度超过50，加载图片
hasShow = true ;
$( " #lazyBox .lazyImg " ).each( function (){
$( this ).attr( " src " ,$( this ).attr( " alt " ));
});
}
});
</ script >
</ body >
</ html >