即使在另一个选项卡中,也要继续Javascript动画
我有一个旋转的轮子,不管发生什么,它都会转动。但是,如果我离开标签,轮子就会停止旋转,直到我聚焦在打开网站的标签上 这是我的密码:即使在另一个选项卡中,也要继续Javascript动画,javascript,animation,background-process,Javascript,Animation,Background Process,我有一个旋转的轮子,不管发生什么,它都会转动。但是,如果我离开标签,轮子就会停止旋转,直到我聚焦在打开网站的标签上 这是我的密码: var colors =["#DD7039", "#171A21", "#FEFEFE", "#171A21", "#FEFEFE", "#171A21", "#FEFEFE", "#171A21", "#FEFEFE", "#171A21", "#FEFEFE", "#171A21", "#FEFEFE", "#171A21", "#FEFEFE", "#171A
var colors =["#DD7039", "#171A21", "#FEFEFE", "#171A21", "#FEFEFE", "#171A21", "#FEFEFE", "#171A21", "#FEFEFE", "#171A21", "#FEFEFE", "#171A21", "#FEFEFE", "#171A21", "#FEFEFE", "#171A21", "#FEFEFE", "#171A21", "#FEFEFE", "#171A21", "#FEFEFE", "#171A21", "#FEFEFE", "#171A21", "#FEFEFE"];
var numbers =["0","21","10","13","3","14","1","17","11","23","4","18","9","24","7","20","5","15","16","22","6","12","19","8","2"];
var startAngle = 0;
var arc = Math.PI / (colors.length / 2);
var spinTimeout = null;
var timeToSpin = 2000;
var spinArcStart = 10;
var spinTime = 0;
var spinTimeTotal = 0;
var ctx;
function drawRouletteWheel() {
var canvas = document.getElementById("canvas");
if (canvas.getContext) {
var outsideRadius = 200;
var textRadius = 160;
var insideRadius = 125;
ctx = canvas.getContext("2d");
ctx.clearRect(0,0,500,500);
ctx.strokeStyle = "black";
ctx.lineWidth = 2;
ctx.font = 'bold 12px Helvetica, Arial';
for(var i = 0; i < colors.length; i++) {
var angle = startAngle + i * arc;
ctx.fillStyle = colors[i];
ctx.beginPath();
ctx.arc(250, 250, outsideRadius, angle, angle + arc, false);
ctx.arc(250, 250, insideRadius, angle + arc, angle, true);
ctx.stroke();
ctx.fill();
ctx.save();
var color;
if (colors[i] == "#FEFEFE") {
color = "black";
}else{
color ="white";
}
ctx.fillStyle = color;
ctx.translate(250 + Math.cos(angle + arc / 2) * textRadius,
250 + Math.sin(angle + arc / 2) * textRadius);
ctx.rotate(angle + arc / 2 + Math.PI / 2);
var text = numbers[i];
ctx.fillText(text, -ctx.measureText(text).width / 2, 0);
ctx.restore();
}
//Arrow
ctx.strokeStyle = "#F0C24E";
ctx.beginPath();
ctx.moveTo(250 + 0, 250 - (outsideRadius + 5));
ctx.lineTo(250 + 0, 250 - (outsideRadius - 80));
ctx.lineWidth = 4;
ctx.stroke();
}
}
function spin() {
spinAngleStart = Math.random() * 10 + 10;
spinTime = 0;
spinTimeTotal = Math.random() * 3 + 4 * timeToSpin;
rotateWheel();
}
function rotateWheel() {
spinTime += 30;
if(spinTime >= spinTimeTotal) {
stopRotateWheel();
return;
}
var spinAngle = spinAngleStart - easeOut(spinTime, 0, spinAngleStart, spinTimeTotal);
startAngle += (spinAngle * Math.PI / 180);
drawRouletteWheel();
spinTimeout = setTimeout('rotateWheel()', 30);
}
function stopRotateWheel() {
clearTimeout(spinTimeout);
var degrees = startAngle * 180 / Math.PI + 90;
var arcd = arc * 180 / Math.PI;
var index = Math.floor((360 - degrees % 360) / arcd);
ctx.save();
ctx.font = 'bold 30px Helvetica, Arial';
ctx.strokeStyle = "black";
ctx.fillStyle = "black";
var text = numbers[index]
ctx.fillText(text, 250 - ctx.measureText(text).width / 2, 250 + 10);
ctx.restore();
}
function easeOut(t, b, c, d) {
var ts = (t/=d)*t;
var tc = ts*t;
return b+c*(tc + -3*ts + 3*t);
}
drawRouletteWheel();
以下代码>var颜色>var颜色=<代码>var颜色=<代码>var颜色=[以下代码>var颜色>var颜色=[以下代码>var颜色>var颜色=[以下以下代码代码>var颜色=[“DD7039”号、“訛DD7039号,”DD70707070707070707039“,,“非非费菲”一个21“,“费费费菲”,以及“,,“171A21个21 21 21”,,“351111111111111111A21,”,”,”,”若若若若若若若若费费费菲,”,”,”,”,”,”,”,”费费费费费费菲“,,,,,,,,,“费费费费费费费费费菲“,,,,,,,,,,,,,,,“费费费费费费费费费费费费费费费费费费费费费费费菲”、“”、“FEFE“,“#171A21”、“#FEFE”、“#171A21”、“#FEFE”、“#171A21”、“#FEFEFE”、“#171A21”、“#FEFE”];
风险值编号=[“0”、“21”、“10”、“13”、“3”、“14”、“1”、“17”、“11”、“23”、“4”、“18”、“9”、“24”、“7”、“20”、“5”、“15”、“16”、“22”、“6”、“12”、“19”、“8”、“2”];
var-startAngle=0;
var arc=Math.PI/(colors.length/2);
var spinTimeout=null;
var-timeToSpin=2000;
var spinArcStart=10;
var spinTime=0;
var spinTimeTotal=0;
var-ctx;
函数DrawRouletWheel(){
var canvas=document.getElementById(“canvas”);
if(canvas.getContext){
var=200;
var textRadius=160;
var insideRadius=125;
ctx=canvas.getContext(“2d”);
ctx.clearRect(0,0500);
ctx.strokeStyle=“黑色”;
ctx.lineWidth=2;
ctx.font='bold 12px Helvetica,Arial';
对于(变量i=0;i是否有方法继续动画(计算),即使网站“未聚焦”您可能应该使用
requestAnationFrame
,仅当窗口部分或完全可见时才请求下一帧
要在您处于不同选项卡时允许播放动画,请使用setTimeout
功能创建您自己的计时器。多亏了@Thomas,我找到了解决方案:
在脚本的开头我添加了:
if (!Date.now) {
Date.now = function() { return new Date().getTime(); }
}
var start = null;
在spin()的内部
我设置了开始变量:
start = Date.now();
现在在rotateWheel()的内部我添加并更改了:
// At the beginning of the function
timePassed = Date.now() - start;
spinTime += timePassed;
在旋转轮()的端:
现在,当我回到窗口时,动画就完成了。@RayonDabre没有帮助也不会帮助我们理解这个问题@RayonDabre更长的评论:我已经尝试了requestAnimationFrame和setTimeout,在这两种情况下,当标签模糊时,循环速度都减慢到了50%以下。测试环境是最新的Firefox。您可以计算每个时刻的角度,而不是增加每帧的角度。你有一个展示台/小提琴,我们可以在那里观看这场比赛吗?那怎么办?你能举个例子吗?
// right before the '.setTimeout'
start += timePassed;