个人中心
文章发布
退出
作者热门文章
- html - 出于某种原因，IE8 对我的 Sass 文件中继承的 html5 CSS 不友好？
- JMeter 在响应断言中使用 span 标签的问题
- html - 在 :hover and :active? 上具有不同效果的 CSS 动画
- html - 相对于居中的 html 内容固定的 CSS 重复背景？
25
4
var COLORS, Confetti, NUM_CONFETTI, PI_2, canvas, confetti, context, drawCircle, i, range, resizeWindow, xpos;
NUM_CONFETTI = 350;
COLORS = [[85, 71, 106], [174, 61, 99], [219, 56, 83], [244, 92, 68], [248, 182, 70]];
PI_2 = 2 * Math.PI;
canvas = document.getElementById("world");
context = canvas.getContext("2d");
window.w = 0;
window.h = 0;
resizeWindow = function() {
window.w = canvas.width = window.innerWidth;
return window.h = canvas.height = window.innerHeight;
};
window.addEventListener('resize', resizeWindow, false);
window.onload = function() {
return setTimeout(resizeWindow, 0);
};
range = function(a, b) {
return (b - a) * Math.random() + a;
};
drawCircle = function(x, y, r, style) {
context.beginPath();
context.arc(x, y, r, 0, PI_2, false);
context.fillStyle = style;
return context.fill();
};
xpos = 0.5;
document.onmousemove = function(e) {
return xpos = e.pageX / w;
};
window.requestAnimationFrame = (function() {
return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function(callback) {
return window.setTimeout(callback, 1000 / 60);
};
})();
Confetti = (function() {
function Confetti() {
this.style = COLORS[~~range(0, 5)];
this.rgb = "rgba(" + this.style[0] + "," + this.style[1] + "," + this.style[2];
this.r = ~~range(2, 6);
this.r2 = 2 * this.r;
this.replace();
}
Confetti.prototype.replace = function() {
this.opacity = 0;
this.dop = 0.03 * range(1, 4);
this.x = range(-this.r2, w - this.r2);
this.y = range(-20, h - this.r2);
this.xmax = w - this.r;
this.ymax = h - this.r;
this.vx = range(0, 2) + 8 * xpos - 5;
return this.vy = 0.7 * this.r + range(-1, 1);
};
Confetti.prototype.draw = function() {
var _ref;
this.x += this.vx;
this.y += this.vy;
this.opacity += this.dop;
if (this.opacity > 1) {
this.opacity = 1;
this.dop *= -1;
}
if (this.opacity < 0 || this.y > this.ymax) {
this.replace();
}
if (!((0 < (_ref = this.x) && _ref < this.xmax))) {
this.x = (this.x + this.xmax) % this.xmax;
}
return drawCircle(~~this.x, ~~this.y, this.r, "" + this.rgb + "," + this.opacity + ")");
};
return Confetti;
})();
confetti = (function() {
var _results;
_results = [];
for (i = 1; 1 <= NUM_CONFETTI ? i <= NUM_CONFETTI : i >= NUM_CONFETTI; 1 <= NUM_CONFETTI ? i++ : i--) {
_results.push(new Confetti);
}
return _results;
})();
window.step = function() {
var c, _i, _len, _results;
requestAnimationFrame(step);
context.clearRect(0, 0, w, h);
_results = [];
for (_i = 0, _len = confetti.length; _i < _len; _i++) {
c = confetti[_i];
_results.push(c.draw());
}
return _results;
};
step();header {
color: gainsboro;
text-align: center;
font-size: 100px;
}
html, body {
margin: 0;
padding: 0;
width: 100%;
height: 100%;
overflow: hidden;
background: #111;
}
canvas {
z-index:-1;
}<!DOCTYPE html>
<html >
<head>
<meta charset="UTF-8">
<title>Falling Confetti</title>
<link rel="stylesheet" href="css/style.css">
</head>
<body>
<canvas id="world"></canvas>
<script src="js/index.js"></script>
<header>Video Game Evolution</header>
<iframe src='//cdn.knightlab.com/libs/timeline3/latest/embed/index.html?source=1z5bofC1Vo2wfXVUtAJHp-_o_tvymManjPeX8c4pNAp0&font=Default&lang=en&initial_zoom=2&height=650' width='100%' height='650' frameborder='0'></iframe>
</body>
</html>它开始显示标题，但 Canvas 妨碍了。我还有一个嵌入的时间线，我想将其显示在 Canvas 上。是js的问题吗？ -------------------------------------------------- -------------------------------------------------- -------------------------------------------------- -------------------------------------------------- -------------------------------------------------- -------------------------------------------------------
最佳答案
让你的 Canvas 绝对定位，给它适当的大小，你应该得到你想要的
canvas {
position:absolute;
top:0;
left:0;
width:100%;
height:100%;
}
注意:去掉 Canvas CSS上的z-index ...这会将其放在正文后面，并且正文有背景，因此隐藏了 Canvas
关于javascript - 如何将动画 Canvas 放在元素后面？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/35518354/
25
4
0
我是一名优秀的程序员,十分优秀！