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源代码如下:
<!DOCTYPE html><html> <head><meta charset="utf-8"><title>黑客帝国文字下落</title><style>html, body {margin:0; padding:0; background-color:#000;}#divList {width:800px; height:500px; border:solid 3px gray; margin: 0px auto; overflow:hidden; position: relative;}.divText {position: absolute;}.divText span {display:block; font-weight: bold; font-family:Courier New; }</style><script src="http://apps.bdimg.com/libs/jquery/1.9.0/jquery.min.js"></script> </head> <body> <h1 style="text-align:center; color:gray;">黑客帝国文字下落 (<span id="spanCount">0</span>)</h1> <div id="divList"> </div> <script> function rand(min, max) {return min + Math.round(Math.random() * (max - min)); } function add() {var x = rand(0, 800);var html = "<div class="divText" style="left:" + x + "px; bottom:500px;">";/*var color1 = [];var color2 = [];var color3 = [];var color4 = [];var color5 = [];var color6 = [];for (var i=1; i<17; i++){ var f = i.toString(16); color1.push("0" + f + "0"); color2.push(f + "00"); color3.push("00" + f); color4.push("0" + f + f); color5.push(f + f + "0"); color6.push(f + "0" + f);}var color = [color1, color2, color3, color4, color5, color6];var ci = rand(0, 5);*/var color = [];for (var i=1; i<17; i++){ var f = i.toString(16); color.push("0" + f + "0");}var fontSize = rand(9, 24);for (var i=1; i<17; i++){ var c = rand(33, 127); var c = String.fromCharCode(c); // html += "<span class="s" + i + "" style="color:#" + color[ci][i-1] + "; font-size:" + fontSize + "px;">" + c + "</span>"; html += "<span class="s" + i + "" style="color:#" + color[i-1] + "; font-size:" + fontSize + "px; text-shadow:0px 0px 10px #" + color[i-1] + ";">" + c + "</span>";}html += "</div>";$("#divList").append(html); } function run() {var x = rand(0, 100);if (x < 100){ add();}$("#spanCount").html($(".divText").size());$(".divText").each(function(){ var y = $(this).css("bottom"); y = parseInt(y); y -= $(this).find("span").eq(0).height(); $(this).css("bottom", "" + y + "px"); if (y + $(this).height() <= 0) {$(this).remove();return; } $(this).find("span").each(function(){var c = rand(33, 127);var c = String.fromCharCode(c);$(this).html(c); });});window.setTimeout(run, 100); } run(); </script> </body></html>代码二:<HTML><HEAD> <TITLE>《黑客帝国》中的字符下落效果</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 = "0<br/>1<br/>0<br/>1<br/>0<br/>0<br/>1<br/>0<br/>1<br/>0<br/>";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)+50; 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>提示:重点是对颜色和速度的随机设置。JavaScript中的“Math”对象用来提供数学运算,其中“Math.random”用来获取一个0到1之间的随机数。“Math.round”是采用四舍五入方式取得最接近的整数。代码中使用了两维数组,“delete”方法用来删除数组中的元素。