HTML5 Canvas 2D API 规范 1.0 中文版

var interval_1=0;
function startShow()
{
var r = Math.floor(Math.random() * (254)),
g = Math.floor(Math.random() * (254)),
b = Math.floor(Math.random() * (254)),
x = Math.floor(Math.random() * (439)),
y = Math.floor(Math.random() * (554)),
color = "rgba("+r+", "+g+", "+b+", 0.5)",
filled = true,
radius = 1;
jc.circle(x, y, radius, color, filled)
.animate({radius:100, opacity:0}, 1500, function(){
this.del();
});
}

function onload_1()
{
jc.start(idCanvas, true);
interval_1 = setInterval(startShow, 200);
}

function start_1(idCanvas)
{
if(interval_1)return;
onload_1();
}

function stop_1(idCanvas)
{
clearInterval(interval_1);
interval_1 = 0;
jc.clear(idCanvas);
}