canvas 2d绘图时，采用动画方式更新，一段时间后出现错误：VM667:1 thirdScriptError

Maximum call stack size exceeded

RangeError: Maximum call stack size exceeded

    at CanvasRenderingContext2D.e.drawImage (http://127.0.0.1:36578/appservice/__dev__/WAService.js:2:648258)

    at CanvasRenderingContext2D.e.drawImage (http://127.0.0.1:36578/appservice/__dev__/WAService.js:2:648807)

我的代码如下：

//画定位图片

drawImageLocation(canvas, ctx,item) {

var that=this;

// Create gradient

var gradient = ctx.createLinearGradient(0, 0, canvas.width, 0);

gradient.addColorStop("0", "magenta");

gradient.addColorStop("0.5", "blue");

gradient.addColorStop("1.0", "red");

// Fill with gradient

ctx.fillStyle = gradient;

ctx.font = "8px Arial";

ctx.fillText(item.upText, item.x, item.y)

ctx.fillText(item.downText, item.x, item.y + 20)

const img = canvas.createImage()

img.src = '/image/marker.png'

//img.onload = function () {

// //ctx.drawImage(img, item.x, item.y, 20, 20)

//}

ctx.drawImage(img, item.x, item.y, 20, 20)

},