JS实现《黑客帝国》中的字符下落效果

2012/10/21 10:13:38作者：佚名来源：网络

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【实例名称】

《黑客帝国》中的字符下落效果

【实例描述】

所有看过电影《黑客帝国》的人可能都对一个场非常熟悉，那就是一连串的0、l编码。本例学习如何制作那种字符下落效果。

【实例代码】

<HTML>
<HEAD>
<TITLE>黑客帝国</TITLE>
<meta http-equiv="Content-Type" content="text/html;charset=gb2312">
</HEAD>
<style type="text/css">
body
{
 overflow:hidden;
 margin:0;
 background-color:#000000;
 font-family:宋体;
}
DIV.#heike
{
 overflow:hidden;
 position:relative;
 top:5%;
 width:90%;
 height:90%;
 border-style:solid;
 border-width:1;
 border-color:#009900;
}
</style>
<script language="javascript">
var strCount;
var str;
var Color;
var Font;
var sLine = "W<br>W<br>W<br>.<br>B<br>a<br>i<br>D<br>u<br>.<br>C<br>O<br>M";
function OnLoad()
{
 strCount = 40;
 str = [];
 Color = [];
 Font = [];
 Color[0] = "#002211";//文字的颜色
 Color[1] = "#003311";
 Color[2] = "#005511";
 Color[3] = "#008811";
 Color[4] = "#00BB99";
 Color[5] = "#114411";
 Color[6] = "#335566";
 Color[7] = "#668899";
 Color[8] = "#99BBAA";
 Color[9] = "#CECECC";
 Font[0] = "10px";    //文字的大小
 Font[1] = "12px";
 Font[2] = "14px";
 Font[3] = "16px";
 Font[4] = "18px";
 setTimeout("strik()",50);
}
function strik()
{
 for(var i=0;i<strCount;i++)
 {
  if(typeof(str[i]) != "undefined")   //如果字符串存在
  {
   if(str[i]["Carch"].style.pixelTop > heike.clientHeight)
   {
    str[i]["Carch"].outerHTML = "";
    delete str[i]["Level"];//删除数组元素
    delete str[i]["Speed"];
    delete str[i]["Carch"];
    delete str[i];
   }
   else
   {
    str[i]["Carch"].style.pixelTop += str[i]["Speed"];
   }
  }
  else if(Math.random()<0.25)             //随机小数
  {
   str[i] = new Array();
   str[i]["Level"] = Math.round(Math.random()*4);
   str[i]["Speed"] = (Math.round(Math.random()*str[i]["Level"])<<2)+10;
   document.all["heike"].insertAdjacentHTML("AfterBegin","<span id='SPAN_"+i+"'>"+sLine+"</span>");
   str[i]["Carch"] = document.all["SPAN_"+i];
   str[i]["Carch"].style.fontSize = Font[str[i]["Level"]];             //字体
   str[i]["Carch"].style.position = "absolute";                        //位置
   str[i]["Carch"].style.pixelLeft = Math.round(Math.random()*heike.clientWidth);  //x坐标
   str[i]["Carch"].style.pixelTop = -str[i]["Carch"].offsetHeight;                 //y坐标
   str[i]["Carch"].style.color = Color[str[i]["Level"]+5];                         //颜色
   str[i]["Carch"].style.filter = "glow(Color="+Color[str[i]["Level"]]+",Strength=5)";//滤镜效果
   str[i]["Carch"].style.zIndex = str[i]["Level"];                                    //z-Index
  }
 }
 setTimeout("strik()",50);
}
</script>
<BODY onload="OnLoad()">
<table width="100%" height="100%" border="0" cellspacing="0" cellpadding="0">
<tr><td align="center" height="100%"><div id="heike"></div></td></tr>
<tr><td align="center" style="padding:5;font-size:9pt;color:#FFFFFF;">使用 IE 6.0 以上版本或以 IE 为核心的浏览器浏览本页，1024*768分辨率为佳</td></tr>
</table>
</BODY>
</HTML>

【运行效果】

运行效果