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);
}