关于HTML，CSS JS代码还原

ChenpiT · 发表于 2018-4-21 17:53:26

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本帖最后由 ChenpiT 于 2018-4-21 18:22 编辑

想要了解如何实现运行下列代码：

//Html代码
<div>
   <canvas id="canvas"></canvas>
   <canvas id="snow"></canvas>

   <div class="am-g" style="position: fixed; bottom: 0px;">
         <div class="am-u-sm-12">
            <div style="z-index: 9999" id="player" class="aplayer">
            </div>
         </div>
   </div>
</div>
//CSS代码
canvas {
         position: fixed;
         width: 100%;
         height: 100%;
         z-index: -1;
   }
//引入JS
<script src="~/Content/assets/js/jquery.min.js"></script>
<script src="~/Scripts/Blog/universe.js"></script>
<script src="~/Scripts/Blog/Fireworks.js"></script>

-------------------------------------分割线-------------------------------------------------------
universe.js
var canvas = document.getElementById('canvas'),
      ctx = canvas.getContext('2d'),
      w = canvas.width = window.innerWidth,
      h = canvas.height = window.innerHeight,

      hue = 217,
      stars = [],
      count = 0,
      maxStars = 1300;//星星数量

var canvas2 = document.createElement('canvas'),
ctx2 = canvas2.getContext('2d');
canvas2.width = 100;
canvas2.height = 100;

var half = canvas2.width / 2,
gradient2 = ctx2.createRadialGradient(half, half, 0, half, half, half);
gradient2.addColorStop(0.025, '#CCC');
gradient2.addColorStop(0.1, 'hsl(' + hue + ', 61%, 33%)');
gradient2.addColorStop(0.25, 'hsl(' + hue + ', 64%, 6%)');
gradient2.addColorStop(1, 'transparent');

ctx2.fillStyle = gradient2;
ctx2.beginPath();
ctx2.arc(half, half, half, 0, Math.PI * 2);
ctx2.fill();

// End cache

function random(min, max) {
if (arguments.length < 2) {
   max = min;
   min = 0;
}

if (min > max) {
   var hold = max;
   max = min;
   min = hold;
}

return Math.floor(Math.random() * (max - min + 1)) + min;
}

function maxOrbit(x, y) {
var max = Math.max(x, y),
   diameter = Math.round(Math.sqrt(max * max + max * max));
return diameter / 2;
//星星移动范围，值越大范围越小，
}

var Star = function () {

this.orbitRadius = random(maxOrbit(w, h));
this.radius = random(60, this.orbitRadius) / 8;
//星星大小
this.orbitX = w / 2;
this.orbitY = h / 2;
this.timePassed = random(0, maxStars);
this.speed = random(this.orbitRadius) / 50000;
//星星移动速度
this.alpha = random(2, 10) / 10;

count++;
stars[count] = this;
}

Star.prototype.draw = function () {
var x = Math.sin(this.timePassed) * this.orbitRadius + this.orbitX,
   y = Math.cos(this.timePassed) * this.orbitRadius + this.orbitY,
   twinkle = random(10);

if (twinkle === 1 && this.alpha > 0) {
   this.alpha -= 0.05;
} else if (twinkle === 2 && this.alpha < 1) {
   this.alpha += 0.05;
}

ctx.globalAlpha = this.alpha;
ctx.drawImage(canvas2, x - this.radius / 2, y - this.radius / 2, this.radius, this.radius);
this.timePassed += this.speed;
}

for (var i = 0; i < maxStars; i++) {
new Star();
}

function animation() {
ctx.globalCompositeOperation = 'source-over';
ctx.globalAlpha = 0.5; //尾巴
ctx.fillStyle = 'hsla(' + hue + ', 64%, 6%, 2)';
ctx.fillRect(0, 0, w, h)

ctx.globalCompositeOperation = 'lighter';
for (var i = 1, l = stars.length; i < l; i++) {
   stars[i].draw();
   canvas2.style.cssText = "display:none";
};

window.requestAnimationFrame(animation);
}

animation();

ChenpiT · 发表于 2018-4-21 18:44:43

以下是我自己还原的，但是浏览器打开时是空白是的，vs上是可以运行出结果的
//index.html文件
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<meta charset="utf-8" />
<title>Star</title>
<link href="/default.css" rel="stylesheet" />
</head>
<body>
<div>
<canvas id="canvas"></canvas>
<canvas id="snow"></canvas>

<div class="am-g" style="position: fixed; bottom: 0px;">
<div class="am-u-sm-12">
<div style="z-index: 9999" id="player" class="aplayer">
</div>
</div>
</div>
</div>
<script src="/main.js/"></script>
</body>
</html>

//main.js文件
var canvas = document.getElementById('canvas'),
ctx = canvas.getContext('2d'),
w = canvas.width = window.innerWidth,
h = canvas.height = window.innerHeight,

hue = 217,
stars = [],
count = 0,
maxStars = 1300;//星星数量

var canvas2 = document.createElement('canvas'),
ctx2 = canvas2.getContext('2d');
canvas2.width = 100;
canvas2.height = 100;

var half = canvas2.width / 2,
gradient2 = ctx2.createRadialGradient(half, half, 0, half, half, half);
gradient2.addColorStop(0.025, '#CCC');
gradient2.addColorStop(0.1, 'hsl(' + hue + ', 61%, 33%)');
gradient2.addColorStop(0.25, 'hsl(' + hue + ', 64%, 6%)');
gradient2.addColorStop(1, 'transparent');

ctx2.fillStyle = gradient2;
ctx2.beginPath();
ctx2.arc(half, half, half, 0, Math.PI * 2);
ctx2.fill();

// End cache

function random(min, max) {
if (arguments.length < 2) {
max = min;
min = 0;
}

if (min > max) {
var hold = max;
max = min;
min = hold;
}

return Math.floor(Math.random() * (max - min + 1)) + min;
}

function maxOrbit(x, y) {
var max = Math.max(x, y),
diameter = Math.round(Math.sqrt(max * max + max * max));
return diameter / 2;
//星星移动范围，值越大范围越小，
}

var Star = function () {

this.orbitRadius = random(maxOrbit(w, h));
this.radius = random(60, this.orbitRadius) / 8;
//星星大小
this.orbitX = w / 2;
this.orbitY = h / 2;
this.timePassed = random(0, maxStars);
this.speed = random(this.orbitRadius) / 50000;
//星星移动速度
this.alpha = random(2, 10) / 10;

count++;
stars[count] = this;
}

Star.prototype.draw = function () {
var x = Math.sin(this.timePassed) * this.orbitRadius + this.orbitX,
y = Math.cos(this.timePassed) * this.orbitRadius + this.orbitY,
twinkle = random(10);

if (twinkle === 1 && this.alpha > 0) {
this.alpha -= 0.05;
} else if (twinkle === 2 && this.alpha < 1) {
this.alpha += 0.05;
}

ctx.globalAlpha = this.alpha;
ctx.drawImage(canvas2, x - this.radius / 2, y - this.radius / 2, this.radius, this.radius);
this.timePassed += this.speed;
}

for (var i = 0; i < maxStars; i++) {
new Star();
}

function animation() {
ctx.globalCompositeOperation = 'source-over';
ctx.globalAlpha = 0.5; //尾巴
ctx.fillStyle = 'hsla(' + hue + ', 64%, 6%, 2)';
ctx.fillRect(0, 0, w, h)

ctx.globalCompositeOperation = 'lighter';
for (var i = 1, l = stars.length; i < l; i++) {
stars[i].draw();
canvas2.style.cssText = "display:none";
};

window.requestAnimationFrame(animation);
}

animation();

//default.css文件
canvas {
position: fixed;
width: 100%;
height: 100%;
z-index: -1;
}

ChenpiT · 发表于 2018-4-21 19:48:30

ChenpiT 发表于 2018-4-21 18:44
以下是我自己还原的，但是浏览器打开时是空白是的，vs上是可以运行出结果的
//index.html文件

终于找到原因了

，这句<script src="/main.js/"></script>应该为<script src="/main.js"></script>

不二如是 · 发表于 2018-4-22 11:12:12

自问自答，如果没问题，帮你标记为已解决了

ChenpiT · 发表于 2018-4-23 14:07:38

不二如是发表于 2018-4-22 11:12
自问自答，如果没问题，帮你标记为已解决了

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