图片翻页滚动效果(JavaScript)

< html >< head >

< meta http - equiv = 'Content - Type' content = 'text / html; charset = gb2312' >

< script language = 'JavaScript' >

var  scrollerheight = 160 ;                                                 // 定义每个区域显示的高度

var  html,total_area = 0 ,wait_flag = true ;       // 初始化html串,总显示区域数,是否等待.

var  bMouseOver  =   1 ;                                             // 鼠标放上去就不滚动了,这里硬编码为true

var  scrollspeed  =   5 ;                                                      // 滚动速度,其实是每次向上移动的象素数,值越大看起来越快

var  waitingtime  =   5000 ;                                          // 每次翻动的等待时间，单位毫秒

var  s_tmp  =   0                                                                               // 初始移动次数

var  s_amount  =   32 ;                                                       // 它的值是由每次需要移动的象素除以scrollspeed换算出来的

var  scroll_content = new  Array();                      // 声明一个数组

var  startPanel = 0 , n_panel = 0 , i = 0 ;            // 声明初始区域,区域个数和循环变量

 

// ********************************************

// 这是我做的一个跟踪变量函数

// 在需要使用跟踪变量的地方直接调用trace()函数就可以了.

var  newwin;

var  isDebug  =   1 ;

function  trace(s)

{

       if(isDebug)

       {

              try

              {

                     newwin.document.write(s + "
");

              }

              catch(e)

              {

                     newwin = window.open("","trace");

                     newwin.document.write(s + "
");

              }

       }      

}

// **********************************************

// 初始化滚动函数

function  startscroll() {

       

       //随机获取初始区域

       //startPanel是0到scroll_content下标的任意数

       i=0;

       for(i in scroll_content)n_panel++;

       n_panel = n_panel -1;

       startPanel = Math.round(Math.random()*n_panel);

 

       //如果初始区域是第一个元素,

       //调用insert_area把scroll_content里所有元素都装到DIV里

       if(startPanel == 0) 

       {

              i=0;

              for(i in scroll_content)

                     insert_area(total_area, total_area++); 

       }

       else 

              //如果初始区域是最后一个元素

              //先把最后一个装进DIV,然后依次把其它元素装进DIY

              if(startPanel == n_panel) //如果是最后一个元素

              {

                     insert_area(startPanel, total_area);

                     total_area++;

                     for(i=0; i<startPanel; i++)

                     {

                            insert_area(i,total_area);

                            total_area++;

                     }

              }

       else

              //如果初始区域不是第一个，也不是最后一个

              //先把当前区域装进DIV,

              //然后再把当前区域之前和之后的区域装进DIV

              if((startPanel > 0) || (startPanel < n_panel)) 

              {

                     insert_area(startPanel,total_area);

                     total_area++;

                     for(i=startPanel+1; i<=n_panel; i++)

                     {

                            insert_area(i,total_area);

                            total_area++;

                     }

                     for(i=0; i<startPanel; i++)

                     {

                            insert_area(i,total_area);

                            total_area++;

                     }

              }

       //每隔waitingtime的时间调用一次scrolling()函数

       window.setTimeout('scrolling()',waitingtime);

}

 

 

// 滚动函数

function  scrolling()

{

       //判断鼠标是否放上去,并且是否在等待

       if(bMouseOver && wait_flag) 

       {

              trace("----------------------------");

              for(i=0;i<total_area;i++)

              {

                     //每次所有区域同意向上移动scrollspeed个象素

                     tmp = document.getElementById('scroll_area'+i).style;

                     tmp.top = parseInt(tmp.top) - scrollspeed;  

                     

                     if(i==0)trace("第一个区域的顶部"+parseInt(tmp.top));

                     //如果从屏幕种移出1个区域的话,被移出的区域从底部出现

                     if (parseInt(tmp.top) <= -scrollerheight) 

                     {

                            tmp.top = scrollerheight*(total_area-1);

                     }

                     

                     trace("移动次数:"+s_tmp);

                     //s_tmp是向上移动的次数,按理说应该移动到正好要移动的象素就该停止了

                     //因为一次向上移动scrollspeed个象素,本例子中一次翻动要移动的象素就是scrollerheight

                     //当然你也可以一次翻动两个scrollerheight

                     //所以要移动scrollerheight/scrollspeed次,s_amount就是这样算出来的.               

                     //因为s_tmp是从0初始化的,所以减去1后才是真正一次翻动要移动的次数

                     //但是呢,因为执行一次scrolling()函数,s_tmp就会增加scroll_content.length多次,

                     //所以移动的次数应当是(s_amount-1)*scroll_content.length),

                     //当翻动次数大于我们算出来的值的时候就要停止,也就是把向上移动的必要条件去调

                     //这从跟踪变量的输出可以看出来

                     if(s_tmp++ > (s_amount-1)*scroll_content.length) 

                     {

                            trace("(s_amount-1)*scroll_content.length="+(s_amount-1)*scroll_content.length)

                            wait_flag=false;//进入等待

                            //等待waitingtime,再消除等待,并且吧s_tmp归零.

                            window.setTimeout('wait_flag=true;s_tmp=0;',waitingtime);

                     }

              }

       }

       //设置1秒钟执行1000次本函数

       window.setTimeout('scrolling()',1);

}

 

function  insert_area(idx, n)

{

html='<div style="left: 0px; width: 100%; position: absolute; top: '+(scrollerheight*n)+'px" id="scroll_area'+n+'">';

html+=scroll_content[idx]+'';html+='div>';document.write(html);

}

// 下面的部分可以由asp循环生成

 

scroll_content[ 0 ]  =  ' < table height = 140  align = center border = 0  width = 300  id = 0 >< tr >< td >< a href = # target = _blank >< IMG SRC = http: // onlytiancai/bak/77love/UploadAdPic/200572695027151.gif width=307 height=140 border=0>';

scroll_content[ 1 ]  =  ' < table height = 140  align = center border = 0  width = 300  id = 1 >< tr >< td >< a href = # target = _blank >< IMG SRC = http: // onlytiancai/bak/77love/UploadAdPic/200572694642351.jpg width=307 height=140 border=0>';

scroll_content[ 2 ]  =  ' < table height = 140  align = center border = 0  width = 300  id = 2 >< tr >< td >< a href = # target = _blank >< IMG SRC = http: // onlytiancai/bak/77love/UploadAdPic/200572694652122.jpg width=307 height=140 border=0>';

startscroll(); script >

From: http://onlytiancai.cnblogs.com/archive/2005/07/27/201013.html

转载于:https://www.cnblogs.com/xiaodi/archive/2006/04/10/371641.html