JS+CSS+HTML实现“代码雨”类似黑客帝国文字下落效果


Posted in Javascript onMarch 17, 2020

先看看JS+CSS+HTML实现“代码雨”类似黑客帝国文字下落最终效果:

JS+CSS+HTML实现“代码雨”类似黑客帝国文字下落效果

HTML代码:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel="stylesheet" type="text/css" href="css/ok.css" rel="external nofollow" >
<title>code by-zhenyu.sha</title>
</head>
 
<body>
<canvas id="canvas"></canvas>
</body>
<script src="http://www.jq22.com/jquery/jquery-1.10.2.js"></script>
<script src="http://neilcarpenter.com/demos/canvas/matrix/stats.min.js"></script>
<script type="text/javascript" src="js/ok.js"></script>
</html>

js代码:

(function() {
  var lastTime = 0;
  var vendors = ['ms', 'moz', 'webkit', 'o'];
  for (var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
    window.requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame'];
    window.cancelAnimationFrame = window[vendors[x] + 'CancelAnimationFrame'] ||
      window[vendors[x] + 'CancelRequestAnimationFrame'];
  }
  if (!window.requestAnimationFrame)
    window.requestAnimationFrame = function(callback, element) {
      var currTime = new Date().getTime();
      var timeToCall = Math.max(0, 16 - (currTime - lastTime));
      var id = window.setTimeout(function() {
          callback(currTime + timeToCall);
        },
        timeToCall);
      lastTime = currTime + timeToCall;
      return id;
    };
  if (!window.cancelAnimationFrame)
    window.cancelAnimationFrame = function(id) {
      clearTimeout(id);
    };
}());
// stats
var stats = new Stats();
stats.setMode(0);
stats.domElement.style.position = 'absolute';
stats.domElement.style.left = '0px';
stats.domElement.style.top = '0px';
document.body.appendChild(stats.domElement);
var M = {
  settings: {
    COL_WIDTH: 20,
    COL_HEIGHT: 25,
    VELOCITY_PARAMS: {
      min: 4,
      max: 8
    },
    CODE_LENGTH_PARAMS: {
      min: 20,
      max: 40
    }
  },
  animation: null,
  c: null,
  ctx: null,
  lineC: null,
  ctx2: null,
  WIDTH: window.innerWidth,
  HEIGHT: window.innerHeight,
  COLUMNS: null,
  canvii: [],
  font: '30px matrix-code',
  letters: ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '$', '+', '-', '*', '/', '=', '%', '"', '\'', '#', '&', '_', '(', ')', ',', '.', ';', ':', '?', '!', '\\', '|', '{', '}', '<', '>', '[', ']', '^', '~'],
  codes: [],
  createCodeLoop: null,
  codesCounter: 0,
  init: function() {
    M.c = document.getElementById('canvas');
    M.ctx = M.c.getContext('2d');
    M.c.width = M.WIDTH;
    M.c.height = M.HEIGHT;
    M.ctx.shadowBlur = 0;
    M.ctx.fillStyle = '#000';
    M.ctx.fillRect(0, 0, M.WIDTH, M.HEIGHT);
    M.ctx.font = M.font;
    M.COLUMNS = Math.ceil(M.WIDTH / M.settings.COL_WIDTH);
    for (var i = 0; i < M.COLUMNS; i++) {
      M.codes[i] = [];
      M.codes[i][0] = {
        'open': true,
        'position': {
          'x': 0,
          'y': 0
        },
        'strength': 0
      };
    }
    M.loop();
    M.createLines();
    M.createCode();
    // not doing this, kills CPU
    // M.swapCharacters();
    window.onresize = function() {
      window.cancelAnimationFrame(M.animation);
      M.animation = null;
      M.ctx.clearRect(0, 0, M.WIDTH, M.HEIGHT);
      M.codesCounter = 0;
      M.ctx2.clearRect(0, 0, M.WIDTH, M.HEIGHT);
      M.WIDTH = window.innerWidth;
      M.HEIGHT = window.innerHeight;
      M.init();
    };
  },
  loop: function() {
    M.animation = requestAnimationFrame(function() {
      M.loop();
    });
    M.draw();
    stats.update();
  },
  draw: function() {
    var velocity, height, x, y, c, ctx;
    // slow fade BG colour
    M.ctx.shadowColor = 'rgba(0, 0, 0, 0.5)';
    M.ctx.fillStyle = 'rgba(0, 0, 0, 0.5)';
    M.ctx.fillRect(0, 0, M.WIDTH, M.HEIGHT);
    M.ctx.globalCompositeOperation = 'source-over';
    for (var i = 0; i < M.COLUMNS; i++) {
      // check member of array isn't undefined at this point
      if (M.codes[i][0].canvas) {
        velocity = M.codes[i][0].velocity;
        height = M.codes[i][0].canvas.height;
        x = M.codes[i][0].position.x;
        y = M.codes[i][0].position.y - height;
        c = M.codes[i][0].canvas;
        ctx = c.getContext('2d');
        M.ctx.drawImage(c, x, y, M.settings.COL_WIDTH, height);
        if ((M.codes[i][0].position.y - height) < M.HEIGHT) {
          M.codes[i][0].position.y += velocity;
        } else {
          M.codes[i][0].position.y = 0;
        }
      }
    }
  },
  createCode: function() {
    if (M.codesCounter > M.COLUMNS) {
      clearTimeout(M.createCodeLoop);
      return;
    }
    var randomInterval = M.randomFromInterval(0, 100);
    var column = M.assignColumn();
    if (column) {
      var codeLength = M.randomFromInterval(M.settings.CODE_LENGTH_PARAMS.min, M.settings.CODE_LENGTH_PARAMS.max);
      var codeVelocity = (Math.random() * (M.settings.VELOCITY_PARAMS.max - M.settings.VELOCITY_PARAMS.min)) + M.settings.VELOCITY_PARAMS.min;
      var lettersLength = M.letters.length;
      M.codes[column][0].position = {
        'x': (column * M.settings.COL_WIDTH),
        'y': 0
      };
      M.codes[column][0].velocity = codeVelocity;
      M.codes[column][0].strength = M.codes[column][0].velocity / M.settings.VELOCITY_PARAMS.max;
      for (var i = 1; i <= codeLength; i++) {
        var newLetter = M.randomFromInterval(0, (lettersLength - 1));
        M.codes[column][i] = M.letters[newLetter];
      }
      M.createCanvii(column);
      M.codesCounter++;
    }
    M.createCodeLoop = setTimeout(M.createCode, randomInterval);
  },
  createCanvii: function(i) {
    var codeLen = M.codes[i].length - 1;
    var canvHeight = codeLen * M.settings.COL_HEIGHT;
    var velocity = M.codes[i][0].velocity;
    var strength = M.codes[i][0].strength;
    var text, fadeStrength;
    var newCanv = document.createElement('canvas');
    var newCtx = newCanv.getContext('2d');
    newCanv.width = M.settings.COL_WIDTH;
    newCanv.height = canvHeight;
    for (var j = 1; j < codeLen; j++) {
      text = M.codes[i][j];
      newCtx.globalCompositeOperation = 'source-over';
      newCtx.font = '30px matrix-code';
      if (j < 5) {
        newCtx.shadowColor = 'hsl(104, 79%, 74%)';
        newCtx.shadowOffsetX = 0;
        newCtx.shadowOffsetY = 0;
        newCtx.shadowBlur = 10;
        newCtx.fillStyle = 'hsla(104, 79%, ' + (100 - (j * 5)) + '%, ' + strength + ')';
      } else if (j > (codeLen - 4)) {
        fadeStrength = j / codeLen;
        fadeStrength = 1 - fadeStrength;
        newCtx.shadowOffsetX = 0;
        newCtx.shadowOffsetY = 0;
        newCtx.shadowBlur = 0;
        newCtx.fillStyle = 'hsla(104, 79%, 74%, ' + (fadeStrength + 0.3) + ')';
      } else {
        newCtx.shadowOffsetX = 0;
        newCtx.shadowOffsetY = 0;
        newCtx.shadowBlur = 0;
        newCtx.fillStyle = 'hsla(104, 79%, 74%, ' + strength + ')';
      }
      newCtx.fillText(text, 0, (canvHeight - (j * M.settings.COL_HEIGHT)));
    }
    M.codes[i][0].canvas = newCanv;
  },
  swapCharacters: function() {
    var randomCodeIndex;
    var randomCode;
    var randomCodeLen;
    var randomCharIndex;
    var newRandomCharIndex;
    var newRandomChar;
    for (var i = 0; i < 20; i++) {
      randomCodeIndex = M.randomFromInterval(0, (M.codes.length - 1));
      randomCode = M.codes[randomCodeIndex];
      randomCodeLen = randomCode.length;
      randomCharIndex = M.randomFromInterval(2, (randomCodeLen - 1));
      newRandomCharIndex = M.randomFromInterval(0, (M.letters.length - 1));
      newRandomChar = M.letters[newRandomCharIndex];
      randomCode[randomCharIndex] = newRandomChar;
    }
    M.swapCharacters();
  },
  createLines: function() {
    M.linesC = document.createElement('canvas');
    M.linesC.width = M.WIDTH;
    M.linesC.height = M.HEIGHT;
    M.linesC.style.position = 'absolute';
    M.linesC.style.top = 0;
    M.linesC.style.left = 0;
    M.linesC.style.zIndex = 10;
    document.body.appendChild(M.linesC);
    var linesYBlack = 0;
    var linesYWhite = 0;
    M.ctx2 = M.linesC.getContext('2d');
    M.ctx2.beginPath();
    M.ctx2.lineWidth = 1;
    M.ctx2.strokeStyle = 'rgba(0, 0, 0, 0.7)';
    while (linesYBlack < M.HEIGHT) {
      M.ctx2.moveTo(0, linesYBlack);
      M.ctx2.lineTo(M.WIDTH, linesYBlack);
      linesYBlack += 5;
    }
    M.ctx2.lineWidth = 0.15;
    M.ctx2.strokeStyle = 'rgba(255, 255, 255, 0.7)';
    while (linesYWhite < M.HEIGHT) {
      M.ctx2.moveTo(0, linesYWhite + 1);
      M.ctx2.lineTo(M.WIDTH, linesYWhite + 1);
      linesYWhite += 5;
    }
    M.ctx2.stroke();
  },
  assignColumn: function() {
    var randomColumn = M.randomFromInterval(0, (M.COLUMNS - 1));
    if (M.codes[randomColumn][0].open) {
      M.codes[randomColumn][0].open = false;
    } else {
      return false;
    }
    return randomColumn;
  },
  randomFromInterval: function(from, to) {
    return Math.floor(Math.random() * (to - from + 1) + from);
  },
  snapshot: function() {
    window.open(M.c.toDataURL());
  }
};
function eventListenerz() {
  var controlToggles = document.getElementsByClassName('toggle-info');
  var controls = document.getElementById('info');
  var snapshotBtn = document.getElementById('snapshot');
  function toggleControls(e) {
    e.preventDefault();
    controls.className = controls.className === 'closed' ? '' : 'closed';
  }
  for (var j = 0; j < 2; j++) {
    controlToggles[j].addEventListener('click', toggleControls, false);
  }
  snapshotBtn.addEventListener('click', M.snapshot, false);
}
window.onload = function() {
  M.init();
  eventListenerz();
};

css代码:

@import url("http://fonts.googleapis.com/css?family=Carrois+Gothic");
@font-face {
  font-family: 'matrix-code';
  src: url('http://neilcarpenter.com/demos/canvas/matrix/font/matrix-code.eot?#iefix') format('embedded-opentype'), url('http://neilcarpenter.com/demos/canvas/matrix/font/matrix-code.woff') format('woff'), url('http://neilcarpenter.com/demos/canvas/matrix/font/matrix-code.ttf') format('truetype'), url('http://neilcarpenter.com/demos/canvas/matrix/font/matrix-code.svg#svgFontName') format('svg');
}
html,
body {
  -webkit-font-smoothing: antialiased;
  font: normal 12px/14px "Carrois Gothic", sans-serif;
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  color: #fff;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
body {
  background: black;
}
#stats {
  z-index: 100;
}
#info {
  background: rgba(0, 0, 0, 0.7);
  position: fixed;
  bottom: 0;
  left: 0px;
  width: 250px;
  padding: 10px 20px 20px;
  z-index: 100;
  -webkit-transform-origin: bottom center;
  -moz-transform-origin: bottom center;
  -o-transform-origin: bottom center;
  transform-origin: bottom center;
  -webkit-transform: rotate(0deg);
  -moz-transform: rotate(0deg);
  -o-transform: rotate(0deg);
  transform: rotate(0deg);
  -webkit-transition: -webkit-transform .5s ease-in-out;
  -moz-transition: -moz-transform .5s ease-in-out;
  -o-transition: -o-transform .5s ease-in-out;
  transition: transform .5s ease-in-out;
}
#info.closed {
  -webkit-transform: rotate(180deg);
  -moz-transform: rotate(180deg);
  -o-transform: rotate(180deg);
  transform: rotate(180deg);
}
.toggle-info {
  position: absolute;
  display: block;
  height: 10px;
  background: rgba(0, 0, 0, 0.8);
  width: 290px;
  left: 0;
  text-align: center;
  padding: 3px 0 7px;
  text-decoration: none;
  color: white;
  text-shadow: none;
}
.toggle-info:hover {
  background: rgb(0, 0, 0);
}
#close {
  top: -20px;
}
#open {
  bottom: -20px;
  -webkit-transform: rotate(-180deg);
  -moz-transform: rotate(-180deg);
  -o-transform: rotate(-180deg);
  transform: rotate(-180deg);
}
button {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  border: 0;
  border-radius: 2px;
  padding: 7px 10px;
  box-shadow: 0 0 3px 0px rgba(255, 255, 255, 0.3);
  cursor: pointer;
}
button:hover {
  background: rgba(255, 255, 255, 0.1);
}
pa {
  color: #fff;
}
pa:hover {
  color: #EFFDEB;
  text-shadow: 0px 0px 5px #75AD61;
}

本文介绍了使用JS+CSS+HTML实现“代码雨”类似黑客帝国文字下落效果的代码实例,更多JS特效请查看下面的相关链接

Javascript 相关文章推荐
Javascript学习笔记4 Eval函数
Jan 11 Javascript
扩展jquery实现客户端表格的分页、排序功能代码
Mar 16 Javascript
JS跨域代码片段
Aug 30 Javascript
基于jQuery仿淘宝产品图片放大镜代码分享
Jun 23 Javascript
JavaScript-html标题滚动效果的简单实现
Sep 08 Javascript
JS 滚动事件window.onscroll与position:fixed写兼容IE6的回到顶部组件
Oct 10 Javascript
js格式化时间的简单实例
Nov 27 Javascript
Bootstrap栅格系统的使用和理解2
Dec 14 Javascript
jQuery实现分页功能(含ajax请求、后台数据、附完整demo)
Apr 03 jQuery
jQuery实现点击自身以外区域关闭弹出层功能完整示例【改进版】
Jul 31 jQuery
小程序云开发如何实现图片上传及发表文字
May 17 Javascript
通过js示例讲解时间复杂度与空间复杂度
Aug 06 Javascript
js实现简单点赞操作
Mar 17 #Javascript
vue+ESLint 配置保存 自动格式化代码
Mar 17 #Javascript
HTML+JS实现“代码雨”效果源码(黑客帝国文字下落效果)
Mar 17 #Javascript
JavaScript实现横版菜单栏
Mar 17 #Javascript
JavaScript实现留言板案例
Mar 17 #Javascript
es6函数之严格模式用法实例分析
Mar 17 #Javascript
JavaScript实现字符串与HTML格式相互转换
Mar 17 #Javascript
You might like
PHP高级OOP技术演示
2009/08/27 PHP
php设计模式 Factory(工厂模式)
2011/06/26 PHP
php CI框架插入一条或多条sql记录示例
2014/07/29 PHP
CodeIgniter生成静态页的方法
2016/05/17 PHP
PHP单例模式数据库连接类与页面静态化实现方法
2019/03/20 PHP
PHP示例演示发送邮件给某个邮箱
2019/04/03 PHP
Thinkphp框架+Layui实现图片/文件上传功能分析
2020/02/07 PHP
懒就要懒到底——鼠标自动点击(含时间判断)
2007/02/20 Javascript
实现超用户体验 table排序javascript实现代码
2009/06/22 Javascript
从数据结构的角度分析 for each in 比 for in 快的多
2013/07/07 Javascript
javascript中2个感叹号的用法实例详解
2014/09/04 Javascript
jquery用offset()方法获得元素的xy坐标
2014/09/06 Javascript
jQuery实现统计输入文字个数的方法
2015/03/11 Javascript
巧用canvas
2017/01/21 Javascript
jQuery实现frame之间互通的方法
2017/06/26 jQuery
vue router自动判断左右翻页转场动画效果
2017/10/10 Javascript
微信小程序 腾讯地图显示偏差问题解决
2019/07/27 Javascript
JavaScript进阶(三)闭包原理与用法详解
2020/05/09 Javascript
微信小程序单选框自定义赋值
2020/05/26 Javascript
JavaScript ES 模块的使用
2020/11/12 Javascript
使用wxPython获取系统剪贴板中的数据的教程
2015/05/06 Python
深入讲解Python函数中参数的使用及默认参数的陷阱
2016/03/13 Python
详解tensorflow实现迁移学习实例
2018/02/10 Python
在python中计算ssim的方法(与Matlab结果一致)
2019/12/19 Python
python encrypt 实现AES加密的实例详解
2020/02/20 Python
PyCharm2020.1.2社区版安装,配置及使用教程详解(Windows)
2020/08/07 Python
python使用列表的最佳方案
2020/08/12 Python
解决HTML5中的audio在手机端和微信端的不能自动播放问题
2019/11/04 HTML / CSS
利用异或运算实现两个无符号数的加法运算
2013/12/20 面试题
太行山上观后感
2015/06/05 职场文书
2015年国庆节标语大全
2015/07/30 职场文书
Nginx使用X-Accel-Redirect实现静态文件下载的统计、鉴权、防盗链、限速等
2021/04/04 Servers
Arthas排查Kubernetes中应用频繁挂掉重启异常
2022/02/28 MySQL
python开发人人对战的五子棋小游戏
2022/05/02 Python
微信小程序实现轮播图指示器
2022/06/25 Javascript
SpringBoot Http远程调用的方法
2022/08/14 Java/Android