此腳本無休止地在所有瀏覽器中記憶。我看不出爲什麼!Javascript繪製畫布內存泄漏
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var particles = [], amount = 5;
var x = 100; var y = 100;
var W, H;
var p, gradient;
//dimensions
if(window.innerHeight){
W = window.innerWidth, H = window.innerHeight;
}else{
W = document.documentElement.clientWidth, H = document.documentElement.clientHeight;
}
canvas.width = W, canvas.height = H;
//array voor de meerdere particles
for(var i=0;i<amount;i++){
particles.push(new create_particle());
}
function create_particle(){
//random positie op canvas
this.x = Math.random()*W;
this.y = Math.random()*H;
//random snelheid
this.vx = Math.random()*20-10;
this.vy = Math.random()*20-10;
//Random kleur
var r = Math.random()*255>>0;
var g = Math.random()*255>>0;
var b = Math.random()*255>>0;
this.color = "rgba("+r+", "+g+", "+b+", 0.5)";
this.radius = Math.random()*20+20;
}
window.requestAnimFrame = (function(){
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function(callback){
window.setTimeout(callback, 1000/60);
};
})();
function draw(){
canvas.width = canvas.width;
canvas.height = canvas.height;
//achtergrond tekenen
//ctx.globalCompositeOperation = "source-over";
//ctx.fillStyle = "rgba(0,0,0,0.5)";
ctx.fillRect(0, 0, W, H);
//ctx.globalCompositeOperation = "lighter";
//teken cirkel
for(var t=0; t<particles.length;t++){
p = particles[t];
//gradient
gradient = ctx.createRadialGradient(p.x,p.y,0,p.x,p.y,p.radius);
gradient.addColorStop(0,"white");
gradient.addColorStop(0.4,"white");
gradient.addColorStop(0.4,p.color);
gradient.addColorStop(1,"black");
ctx.beginPath();
ctx.fillStyle = gradient;
ctx.arc(p.x,p.y,p.radius,Math.PI*2,false)
ctx.fill();
//beweeg
p.x+=p.vx;
p.y+=p.vy;
//canvas boundery detect
if(p.x < -50)p.x = W+50;
if(p.y < -50)p.y=H+50;
if(p.x > W+50)p.x = -50;
if(p.y > H+50)p.y = -50;
}
}
(function animloop(){
canvas.width = canvas.width;
canvas.height = canvas.height;
requestAnimFrame(animloop);
draw();
})();
//resize?
function resizeCanvas(){
canvas.height = W;
canvas.width = H;
ctx.fillRect(0, 0, W, H);
}
if(window.addEventListener){
window.addEventListener('resize', resizeCanvas, false);
}else{
window.attachEvent('resize', resizeCanvas);
}
我試圖改變一些代碼(這也是最終版本),但它仍然泄漏。如果你使用這個腳本並觀看'taskmanager'或瀏覽器內存檢查,你會發現它慢慢地,不斷地吃內存。
編輯:在canvas.height解決方案中添加並移動一些聲明後,腳本仍然泄漏!我必須說,看起來Firefox比Chrome更難泄露!
不要使用任務管理器。使用Firefox和about:內存選項卡,以便獲得準確的報告內存消耗情況。 –
只是一個參考,因爲即使在那裏,它是比可見..但感謝提示:) – Dominique
嗨。你有沒有找到一個答案,除了「有漸變內存泄漏」? –