定时器 制作一张canvas走势图问题。思路感觉是对的。 就是不动

    function draw() {
        var canvas = document.getElementById("canvas").getContext('2d');;
        var img = new Image();
        img.onload = function () {
            canvas.drawImage(img, 0, 0);
            canvas.beginPath();
            canvas.moveTo(50,100);
            var x = 11;
            for (var i = 0; i < x; i++) {
                setInterval(

                canvas.lineTo(10*1*x, 30*2*x)
                    ,2000)
            }
            canvas.stroke();
        }
        img.src = '2333.png';
    }

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setInterval的第一个参数需要是function或者code字符串
canvas.lineTo并没有返回值

应该是这样吧

setInterval(function () {
    canvas.lineTo(10*1*x, 30*2*x)
}, 2000)