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) },