<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>王小卓雅月中愁</title>
<style type="text/css">
html,body{width: 100%;height: 850px;}
body{
background: #000;
overflow: hidden;
margin: 0;
padding: 0;
}
</style>
</head>
<body>
<canvas id="cvs"></canvas>
<script type="text/javascript">
var cvs = document.getElementById("cvs");
var ctx = cvs.getContext("2d");
var cw = cvs.width = document.body.clientWidth;
var ch = cvs.height = document.body.clientHeight;
//動畫繪制對象
var requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame || window.msRequestAnimationFrame;
var codeRainArr = []; //代碼雨數組
var cols = parseInt(cw/14); //代碼雨列數
var step = 26 ; //步長，每一列內部數字之間的上下間隔
ctx.font = "bold 26px microsoft yahei"; //聲明字體，個人喜歡微軟雅黑
function createColorCv() {
//畫布基本顏色
ctx.fillStyle="#242424";
ctx.fillRect(0,0,cw,ch);
}
//創建代碼雨
function createCodeRain() {
for (var n = 0; n < cols; n++) {
var col = [];
//基礎位置，為了列與列之間產生錯位
var basePos = parseInt(Math.random()*300);
//隨機速度 3~13之間
var speed = parseInt(Math.random()*10)+3;
//每組的x軸位置隨機產生
var colx = parseInt(Math.random()*cw)
//綠色隨機
var rgbr= 0;
var rgbg= parseInt(Math.random()*255);
var rgbb= 0;
//ctx.fillStyle = "rgb("+r+','+g+','+b+")"
for (var i = 0; i < parseInt(ch/step)/2; i++) {
var code = {
x : colx,
y : -(step*i)-basePos,
speed : speed,
// text : parseInt(Math.random()*10)%2 == 0 ? 0 : 1 //隨機生成0或者1
text : ["a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","s","t","u","v","w","x","y","z"][parseInt(Math.random()*11)], //隨機生成字母數組中的一個
color : "rgb("+rgbr+','+rgbg+','+rgbb+")"
}
col.push(code);
}
codeRainArr.push(col);
}
}
//代碼雨下起來
function codeRaining(){
//把畫布擦干凈
ctx.clearRect(0,0,cw,ch);
//創建有顏色的畫布
//createColorCv();
for (var n = 0; n < codeRainArr.length; n++) {
//取出列
col = codeRainArr[n];
//遍歷列，畫出該列的代碼
for (var i = 0; i < col.length; i++) {
var code = col[i];
if(code.y > ch){
//如果超出下邊界則重置到頂部
code.y = 0;
}else{
//勻速降落
code.y += code.speed;
}
//顏色也隨機變化
//ctx.fillStyle = "hsl("+(parseInt(Math.random()*359)+1)+",30%,"+(50-i*2)+"%)";
//綠色逐漸變淺
//ctx.fillStyle = "hsl(123,30%,"+(30-i*2)+"%)";
//綠色隨機
//var r= 0;
//var g= parseInt(Math.random()*255) + 3;
//var b= 0;
//ctx.fillStyle = "rgb("+r+','+g+','+b+")"
ctx.fillStyle = code.color;
//把代碼畫出來
ctx.fillText(code.text,code.x,code.y);
}
}
requestAnimationFrame(codeRaining);
}
//創建代碼雨
createCodeRain();
//開始下雨吧 GO>>
requestAnimationFrame(codeRaining);
</script>
</body>
</html>
代碼雨 html實現
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