我一直在使用一些不同的javascript工具来生成五彩纸屑和庆祝效果。所有这些都是某种叠加图形。它会阻止点击按钮，链接等。有没有办法让图层保持在前面，但忽略该元素的实际点击，或允许点击动画图层。
我现在尝试使用的脚本示例是：http://codepen.io/iprodev/full/azpWBr/
html示例
<canvas height='1' id='confetti' width='1'></canvas>
CSS
html, body {
margin: 0;
padding: 0;
background: #000;
height: 100%;
width: 100%;
}
#confetti{
position: absolute;
left: 0;
top: 0;
height: 100%;
width: 100%;
}
的Javascript
var retina = window.devicePixelRatio,
// Math shorthands
PI = Math.PI,
sqrt = Math.sqrt,
round = Math.round,
random = Math.random,
cos = Math.cos,
sin = Math.sin,
// Local WindowAnimationTiming interface
rAF = window.requestAnimationFrame,
cAF = window.cancelAnimationFrame || window.cancelRequestAnimationFrame,
_now = Date.now || function () {return new Date().getTime();};
// Local WindowAnimationTiming interface polyfill
(function (w) {
/**
* Fallback implementation.
*/
var prev = _now();
function fallback(fn) {
var curr = _now();
var ms = Math.max(0, 16 - (curr - prev));
var req = setTimeout(fn, ms);
prev = curr;
return req;
}
/**
* Cancel.
*/
var cancel = w.cancelAnimationFrame
|| w.webkitCancelAnimationFrame
|| w.clearTimeout;
rAF = w.requestAnimationFrame
|| w.webkitRequestAnimationFrame
|| fallback;
cAF = function(id){
cancel.call(w, id);
};
}(window));
document.addEventListener("DOMContentLoaded", function() {
var speed = 50,
duration = (1.0 / speed),
confettiRibbonCount = 11,
ribbonPaperCount = 30,
ribbonPaperDist = 8.0,
ribbonPaperThick = 8.0,
confettiPaperCount = 95,
DEG_TO_RAD = PI / 180,
RAD_TO_DEG = 180 / PI,
colors = [
["#df0049", "#660671"],
["#00e857", "#005291"],
["#2bebbc", "#05798a"],
["#ffd200", "#b06c00"]
];
function Vector2(_x, _y) {
this.x = _x, this.y = _y;
this.Length = function() {
return sqrt(this.SqrLength());
}
this.SqrLength = function() {
return this.x * this.x + this.y * this.y;
}
this.Add = function(_vec) {
this.x += _vec.x;
this.y += _vec.y;
}
this.Sub = function(_vec) {
this.x -= _vec.x;
this.y -= _vec.y;
}
this.Div = function(_f) {
this.x /= _f;
this.y /= _f;
}
this.Mul = function(_f) {
this.x *= _f;
this.y *= _f;
}
this.Normalize = function() {
var sqrLen = this.SqrLength();
if (sqrLen != 0) {
var factor = 1.0 / sqrt(sqrLen);
this.x *= factor;
this.y *= factor;
}
}
this.Normalized = function() {
var sqrLen = this.SqrLength();
if (sqrLen != 0) {
var factor = 1.0 / sqrt(sqrLen);
return new Vector2(this.x * factor, this.y * factor);
}
return new Vector2(0, 0);
}
}
Vector2.Lerp = function(_vec0, _vec1, _t) {
return new Vector2((_vec1.x - _vec0.x) * _t + _vec0.x, (_vec1.y - _vec0.y) * _t + _vec0.y);
}
Vector2.Distance = function(_vec0, _vec1) {
return sqrt(Vector2.SqrDistance(_vec0, _vec1));
}
Vector2.SqrDistance = function(_vec0, _vec1) {
var x = _vec0.x - _vec1.x;
var y = _vec0.y - _vec1.y;
return (x * x + y * y + z * z);
}
Vector2.Scale = function(_vec0, _vec1) {
return new Vector2(_vec0.x * _vec1.x, _vec0.y * _vec1.y);
}
Vector2.Min = function(_vec0, _vec1) {
return new Vector2(Math.min(_vec0.x, _vec1.x), Math.min(_vec0.y, _vec1.y));
}
Vector2.Max = function(_vec0, _vec1) {
return new Vector2(Math.max(_vec0.x, _vec1.x), Math.max(_vec0.y, _vec1.y));
}
Vector2.ClampMagnitude = function(_vec0, _len) {
var vecNorm = _vec0.Normalized;
return new Vector2(vecNorm.x * _len, vecNorm.y * _len);
}
Vector2.Sub = function(_vec0, _vec1) {
return new Vector2(_vec0.x - _vec1.x, _vec0.y - _vec1.y, _vec0.z - _vec1.z);
}
function EulerMass(_x, _y, _mass, _drag) {
this.position = new Vector2(_x, _y);
this.mass = _mass;
this.drag = _drag;
this.force = new Vector2(0, 0);
this.velocity = new Vector2(0, 0);
this.AddForce = function(_f) {
this.force.Add(_f);
}
this.Integrate = function(_dt) {
var acc = this.CurrentForce(this.position);
acc.Div(this.mass);
var posDelta = new Vector2(this.velocity.x, this.velocity.y);
posDelta.Mul(_dt);
this.position.Add(posDelta);
acc.Mul(_dt);
this.velocity.Add(acc);
this.force = new Vector2(0, 0);
}
this.CurrentForce = function(_pos, _vel) {
var totalForce = new Vector2(this.force.x, this.force.y);
var speed = this.velocity.Length();
var dragVel = new Vector2(this.velocity.x, this.velocity.y);
dragVel.Mul(this.drag * this.mass * speed);
totalForce.Sub(dragVel);
return totalForce;
}
}
function ConfettiPaper(_x, _y) {
this.pos = new Vector2(_x, _y);
this.rotationSpeed = (random() * 600 + 800);
this.angle = DEG_TO_RAD * random() * 360;
this.rotation = DEG_TO_RAD * random() * 360;
this.cosA = 1.0;
this.size = 5.0;
this.oscillationSpeed = (random() * 1.5 + 0.5);
this.xSpeed = 40.0;
this.ySpeed = (random() * 60 + 50.0);
this.corners = new Array();
this.time = random();
var ci = round(random() * (colors.length - 1));
this.frontColor = colors[ci][0];
this.backColor = colors[ci][1];
for (var i = 0; i < 4; i++) {
var dx = cos(this.angle + DEG_TO_RAD * (i * 90 + 45));
var dy = sin(this.angle + DEG_TO_RAD * (i * 90 + 45));
this.corners[i] = new Vector2(dx, dy);
}
this.Update = function(_dt) {
this.time += _dt;
this.rotation += this.rotationSpeed * _dt;
this.cosA = cos(DEG_TO_RAD * this.rotation);
this.pos.x += cos(this.time * this.oscillationSpeed) * this.xSpeed * _dt
this.pos.y += this.ySpeed * _dt;
if (this.pos.y > ConfettiPaper.bounds.y) {
this.pos.x = random() * ConfettiPaper.bounds.x;
this.pos.y = 0;
}
}
this.Draw = function(_g) {
if (this.cosA > 0) {
_g.fillStyle = this.frontColor;
} else {
_g.fillStyle = this.backColor;
}
_g.beginPath();
_g.moveTo((this.pos.x + this.corners[0].x * this.size) * retina, (this.pos.y + this.corners[0].y * this.size * this.cosA) * retina);
for (var i = 1; i < 4; i++) {
_g.lineTo((this.pos.x + this.corners[i].x * this.size) * retina, (this.pos.y + this.corners[i].y * this.size * this.cosA) * retina);
}
_g.closePath();
_g.fill();
}
}
ConfettiPaper.bounds = new Vector2(0, 0);
function ConfettiRibbon(_x, _y, _count, _dist, _thickness, _angle, _mass, _drag) {
this.particleDist = _dist;
this.particleCount = _count;
this.particleMass = _mass;
this.particleDrag = _drag;
this.particles = new Array();
var ci = round(random() * (colors.length - 1));
this.frontColor = colors[ci][0];
this.backColor = colors[ci][1];
this.xOff = (cos(DEG_TO_RAD * _angle) * _thickness);
this.yOff = (sin(DEG_TO_RAD * _angle) * _thickness);
this.position = new Vector2(_x, _y);
this.prevPosition = new Vector2(_x, _y);
this.velocityInherit = (random() * 2 + 4);
this.time = random() * 100;
this.oscillationSpeed = (random() * 2 + 2);
this.oscillationDistance = (random() * 40 + 40);
this.ySpeed = (random() * 40 + 80);
for (var i = 0; i < this.particleCount; i++) {
this.particles[i] = new EulerMass(_x, _y - i * this.particleDist, this.particleMass, this.particleDrag);
}
this.Update = function(_dt) {
var i = 0;
this.time += _dt * this.oscillationSpeed;
this.position.y += this.ySpeed * _dt;
this.position.x += cos(this.time) * this.oscillationDistance * _dt;
this.particles[0].position = this.position;
var dX = this.prevPosition.x - this.position.x;
var dY = this.prevPosition.y - this.position.y;
var delta = sqrt(dX * dX + dY * dY);
this.prevPosition = new Vector2(this.position.x, this.position.y);
for (i = 1; i < this.particleCount; i++) {
var dirP = Vector2.Sub(this.particles[i - 1].position, this.particles[i].position);
dirP.Normalize();
dirP.Mul((delta / _dt) * this.velocityInherit);
this.particles[i].AddForce(dirP);
}
for (i = 1; i < this.particleCount; i++) {
this.particles[i].Integrate(_dt);
}
for (i = 1; i < this.particleCount; i++) {
var rp2 = new Vector2(this.particles[i].position.x, this.particles[i].position.y);
rp2.Sub(this.particles[i - 1].position);
rp2.Normalize();
rp2.Mul(this.particleDist);
rp2.Add(this.particles[i - 1].position);
this.particles[i].position = rp2;
}
if (this.position.y > ConfettiRibbon.bounds.y + this.particleDist * this.particleCount) {
this.Reset();
}
}
this.Reset = function() {
this.position.y = -random() * ConfettiRibbon.bounds.y;
this.position.x = random() * ConfettiRibbon.bounds.x;
this.prevPosition = new Vector2(this.position.x, this.position.y);
this.velocityInherit = random() * 2 + 4;
this.time = random() * 100;
this.oscillationSpeed = random() * 2.0 + 1.5;
this.oscillationDistance = (random() * 40 + 40);
this.ySpeed = random() * 40 + 80;
var ci = round(random() * (colors.length - 1));
this.frontColor = colors[ci][0];
this.backColor = colors[ci][1];
this.particles = new Array();
for (var i = 0; i < this.particleCount; i++) {
this.particles[i] = new EulerMass(this.position.x, this.position.y - i * this.particleDist, this.particleMass, this.particleDrag);
}
}
this.Draw = function(_g) {
for (var i = 0; i < this.particleCount - 1; i++) {
var p0 = new Vector2(this.particles[i].position.x + this.xOff, this.particles[i].position.y + this.yOff);
var p1 = new Vector2(this.particles[i + 1].position.x + this.xOff, this.particles[i + 1].position.y + this.yOff);
if (this.Side(this.particles[i].position.x, this.particles[i].position.y, this.particles[i + 1].position.x, this.particles[i + 1].position.y, p1.x, p1.y) < 0) {
_g.fillStyle = this.frontColor;
_g.strokeStyle = this.frontColor;
} else {
_g.fillStyle = this.backColor;
_g.strokeStyle = this.backColor;
}
if (i == 0) {
_g.beginPath();
_g.moveTo(this.particles[i].position.x * retina, this.particles[i].position.y * retina);
_g.lineTo(this.particles[i + 1].position.x * retina, this.particles[i + 1].position.y * retina);
_g.lineTo(((this.particles[i + 1].position.x + p1.x) * 0.5) * retina, ((this.particles[i + 1].position.y + p1.y) * 0.5) * retina);
_g.closePath();
_g.stroke();
_g.fill();
_g.beginPath();
_g.moveTo(p1.x * retina, p1.y * retina);
_g.lineTo(p0.x * retina, p0.y * retina);
_g.lineTo(((this.particles[i + 1].position.x + p1.x) * 0.5) * retina, ((this.particles[i + 1].position.y + p1.y) * 0.5) * retina);
_g.closePath();
_g.stroke();
_g.fill();
} else if (i == this.particleCount - 2) {
_g.beginPath();
_g.moveTo(this.particles[i].position.x * retina, this.particles[i].position.y * retina);
_g.lineTo(this.particles[i + 1].position.x * retina, this.particles[i + 1].position.y * retina);
_g.lineTo(((this.particles[i].position.x + p0.x) * 0.5) * retina, ((this.particles[i].position.y + p0.y) * 0.5) * retina);
_g.closePath();
_g.stroke();
_g.fill();
_g.beginPath();
_g.moveTo(p1.x * retina, p1.y * retina);
_g.lineTo(p0.x * retina, p0.y * retina);
_g.lineTo(((this.particles[i].position.x + p0.x) * 0.5) * retina, ((this.particles[i].position.y + p0.y) * 0.5) * retina);
_g.closePath();
_g.stroke();
_g.fill();
} else {
_g.beginPath();
_g.moveTo(this.particles[i].position.x * retina, this.particles[i].position.y * retina);
_g.lineTo(this.particles[i + 1].position.x * retina, this.particles[i + 1].position.y * retina);
_g.lineTo(p1.x * retina, p1.y * retina);
_g.lineTo(p0.x * retina, p0.y * retina);
_g.closePath();
_g.stroke();
_g.fill();
}
}
}
this.Side = function(x1, y1, x2, y2, x3, y3) {
return ((x1 - x2) * (y3 - y2) - (y1 - y2) * (x3 - x2));
}
}
ConfettiRibbon.bounds = new Vector2(0, 0);
confetti = {};
confetti.Context = function(id) {
var i = 0;
var canvas = document.getElementById(id);
var canvasParent = canvas.parentNode;
var canvasWidth = canvasParent.offsetWidth;
var canvasHeight = canvasParent.offsetHeight;
canvas.width = canvasWidth * retina;
canvas.height = canvasHeight * retina;
var context = canvas.getContext('2d');
var interval = null;
var confettiRibbons = new Array();
ConfettiRibbon.bounds = new Vector2(canvasWidth, canvasHeight);
for (i = 0; i < confettiRibbonCount; i++) {
confettiRibbons[i] = new ConfettiRibbon(random() * canvasWidth, -random() * canvasHeight * 2, ribbonPaperCount, ribbonPaperDist, ribbonPaperThick, 45, 1, 0.05);
}
var confettiPapers = new Array();
ConfettiPaper.bounds = new Vector2(canvasWidth, canvasHeight);
for (i = 0; i < confettiPaperCount; i++) {
confettiPapers[i] = new ConfettiPaper(random() * canvasWidth, random() * canvasHeight);
}
this.resize = function() {
canvasWidth = canvasParent.offsetWidth;
canvasHeight = canvasParent.offsetHeight;
canvas.width = canvasWidth * retina;
canvas.height = canvasHeight * retina;
ConfettiPaper.bounds = new Vector2(canvasWidth, canvasHeight);
ConfettiRibbon.bounds = new Vector2(canvasWidth, canvasHeight);
}
this.start = function() {
this.stop()
var context = this;
this.update();
}
this.stop = function() {
cAF(this.interval);
}
this.update = function() {
var i = 0;
context.clearRect(0, 0, canvas.width, canvas.height);
for (i = 0; i < confettiPaperCount; i++) {
confettiPapers[i].Update(duration);
confettiPapers[i].Draw(context);
}
for (i = 0; i < confettiRibbonCount; i++) {
confettiRibbons[i].Update(duration);
confettiRibbons[i].Draw(context);
}
this.interval = rAF(function() {
confetti.update();
});
}
}
var confetti = new confetti.Context('confetti');
confetti.start();
window.addEventListener('resize', function(event){
confetti.resize();
});
});