兼容多浏览器的字幕特效Marquee的通用js类

兼容多浏览器的字幕特效Marquee的通用js类_链接特效

WBOY

發布： 2016-05-16 19:02:25

原創

806 人瀏覽過

Marquee.js

参数说明:
demo  字幕区域标签(div)的ID;
demo1/demo2  显示内容标签(div或td)的ID   demo1为原始内容,demo2是它的拷贝;
direction 字幕方向(up,down,left,right) ;
delay 字幕播放的延迟时间(毫秒);
step 字幕播放的步长(即pix,步长越小,如step=1,滚动越平滑)

function Marquee (demo, demo1, demo2, direction, delay, step)
{
direction = direction.toLowerCase();

if(((direction == "up" || direction == "down") && ($(demo1).offsetHeight > $(demo).offsetHeight)) || ((direction == "left" || direction == "right") && ($(demo1).offsetWidth > $(demo).offsetWidth)))
{
  $(demo2).innerHTML = $(demo1).innerHTML;
  if(direction == "down")
   $(demo).scrollTop = 2 * $(demo1).offsetHeight - $(demo).offsetHeight;
  if(direction == "right")
   $(demo).scrollLeft = 2 * $(demo1).offsetWidth - $(demo).offsetWidth;
}
else
  return;

var flag = true;
var speed = delay == null? 1 : parseInt(delay);
var amount = step == null? 1 : parseInt(step);

var Marquee = function ()
{
  switch(direction)
  {
   case "up":
    if($(demo2).offsetTop - $(demo).scrollTop      $(demo).scrollTop -= $(demo1).offsetHeight;
    else
     $(demo).scrollTop += amount;
    break;
   case "down":
    if($(demo1).offsetTop - $(demo).scrollTop >= 0)
     $(demo).scrollTop += $(demo2).offsetHeight;
    else
     $(demo).scrollTop -= amount;
    break;
   case "left":
    if($(demo2).offsetWidth - $(demo).scrollLeft      $(demo).scrollLeft -= $(demo1).offsetWidth;
    else
     $(demo).scrollLeft += amount;
    break;
   case "right":
    if($(demo).scrollLeft      $(demo).scrollLeft += $(demo2).offsetWidth;
    else
     $(demo).scrollLeft -= amount;
    break;
   default:break;
  }
}

var timer = setInterval(Marquee,speed);

var play = function ()
{
  if(flag)
  {
   clearInterval(timer);
   timer = setInterval(Marquee, speed);
  }
}

$(demo).onmouseover = function ()
{
  if(flag)
   clearInterval(timer);
}

$(demo).onmouseout = function ()
{
  if(flag)
   timer = setInterval(Marquee, speed);
}

this.delay = function (s)
{
  speed = s == null? 50 : parseInt(s);
  play();
}

this.step = function (s)
{
  amount = s == null? 1 : parseInt(s);
  play();
}

this.start = function ()
{
  if(!flag)
  {
   flag = true;
   play();
  }
}

this.stop = function ()
{
  if(flag)
  {
   flag = false;
   clearInterval(timer);
  }
}

this.direction = function (s)
{
  s = s.toLowerCase();
  if( s == direction )
   return;
  if(s == "down" && direction == "up" )
   direction = s;
  if(s == "up" && direction == "down")
   direction = s;
  if(s == "right" && direction == "left")
   direction = s;
  if(s == "left" && direction == "right")
   direction = s;
  if (s == direction)
   play();
}
}

上面js里用到的$或$F,如果你用过prototype.js的话,把它添加进去就行了; 否则你需要先引用下面的js文件: Ruby.js  (从prototype.js里截过来的呵呵)

function Ruby ()
{
}

if (!Array.prototype.push) {
  Array.prototype.push = function() {
      var startLength = this.length;
      for (var i = 0; i       this[startLength + i] = arguments[i];
     return this.length;
  }
}

$ = function ()
{
  var elements = new Array();

  for (var i = 0; i     var element = arguments[i];
    if (typeof element == ''string'')
      element = document.getElementById(element);

    if (arguments.length == 1)
      return element;

    elements.push(element);
  }

  return elements;
}

$F = function ()
{
if(arguments.length == 1)
  return document.getElementById(arguments[0]).value;
else
{
  var elements = new Array();
  for(var i = 0;i  {
   elements.push(document.getElementById(arguments[i]).value);
  }
  return elements;
}
}

到这里,js文件已经搞定了,开始写HTML代码:

(1)先添加css样式,如果你不想滚动字幕里的内容被无故撑大的话(有时候)

(2)添加js文件  -->用了prototype.js的更好,替换掉Ruby.js   :)
<script></script>
<script></script>

(3)添加字幕区域内容
1. 向上或向下滚动

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