SOURCE

var clock;//普朗克时钟
var canvas;
var ctx;


window.onload = function () {
    canvas = document.getElementById("paper");
    ctx = canvas.getContext("2d");
}

function start() {
    clock = setInterval("nextTick()", 100);
}

function stop() {
    clearInterval(clock);
}

function nextTick() {
    console.log("->");


    /********************/
    
    ctx.fillStyle = "rgb(200,0,0)";
    ctx.fillRect(100,10,50,50);

}

<canvas id="paper" width="500px" height="500px">
    Shit! Loading Failed!
</canvas>

<button onclick="start()">开始</button>
<button onclick="stop()">停止</button>

canvas{
    border: 1px solid black;
}