|
0
|
shirokoLv6资深互助发布于2021-8-4 10:44
|
初始化后事件： $(this.element).prepend('<canvas id="canvas" style="position:absolute;z-index:-2;"></canvas>'); |
-
ad(提问者)
- 错误了 js 错误
-
shiroko 回复 ad(提问者)
- 什么错误？你写的是组件的初始化事件？
-
ad(提问者)
- 没错了 但是还是加到body里面
-
ad(提问者)
- $(this.element).prepend(\'\');
var canvas = document.getElementById(\'canvas\'),
ctx = canvas.getContext(\'2d\'),
w = canvas.width = window.innerWidth,
h = canvas.height = window.innerHeight,
hue = 217,
stars = [],
count = 0,
maxStars = 1100; //星星数量,默认1300
var canvas2 = document.createElement(\'canvas\'),
ctx2 = canvas2.getContext(\'2d\');
canvas2.width = 100;
canvas2.height = 100;
var half = canvas2.width / 2,
gradient2 = ctx2.createRadialGradient(half, half, 0, half, half, half);
gradient2.addColorStop(0.025, \'#CCC\');$(\"body\").prepend(\'\');
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 = 1100; //星星数量,默认1300
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) / 10; //星星大小,值越大星星越小,默认8
this.orbitX = w / 2;
this.orbitY = h / 2;
this.timePassed = random(0, maxStars);
this.speed = random(this.orbitRadius) / 80000; //星星移动速度,值越大越慢,默认5W
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();
};
window.requestAnimationFrame(animation);
}
animation();
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) / 10; //星星大小,值越大星星越小,默认8
this.orbitX = w / 2;
this.orbitY = h / 2;
this.timePassed = random(0, maxStars);
this.speed = random(this.orbitRadius) / 80000; //星星移动速度,值越大越慢,默认5W
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();
};
window.requestAnimationFrame(animation);
}
animation();
-
shiroko 回复 ad(提问者)
- 你下面不是还有一个body没改吗？
|
|
1min目标场景问卷
立即参与
