<canvas type="2d" id="myCanvass" class="canvas-div"       style="height:{{canvasInfo.height}}px; position: relative; width:{{canvasInfo.width}}px;transform: scale({{ canvasInfo.scale }});top:{{canvasInfo.top}}px; left:{{canvasInfo.left}}px;"       catchtouchstart="touchstart"       catchtouchmove="touchmove"       catchtouchend="touchend">     </canvas> 这里的canvasInfo是通过下面js回调的值。 其中，js部分如下，其中有针对子组件创建画布，还是当前组件创建画布的判断。 const query = opts.obj && opts.obj.$wx ? wx.createSelectorQuery().in(opts.obj.$wx) : wx.createSelectorQuery()         query.select('#' + this.id)           .fields({ node: true, size: true },(sizeValue)=>{             this.canvasNodewh["_left"] = sizeValue.node._left             this.canvasNodewh["_top"] = sizeValue.node._top           })           .exec((res) => {             this.canvas = res[0].node             this.ctx = this.canvas.getContext('2d')             const sysInfo = wx.getSystemInfoSync();             const dpr = sysInfo.pixelRatio             const winWidth = sysInfo.windowWidth, winHeight = sysInfo.windowHeight;             //--begin             this.scaleNum = 1             if (opts && opts.height && opts.width) {               if(opts.width > winWidth || opts.height > winHeight){                 let n = Number(opts.width) / Number(opts.height),                   t = Number(winWidth) / Number(winHeight);                 if (n > t) {                   this.scaleNum = Number(winWidth) / Number(opts.width)                 } else {                   this.scaleNum = Number(winHeight) / Number(opts.height)                 }               }             }             //--end             if(opts.obj && opts.obj.$wx){               this.canvas.width = res[0].width * dpr               this.canvas.height = res[0].height * dpr               this.ctx.scale(dpr, dpr)               //绘画中，获取到的坐标值，超过canvas范围，则放弃处理               this.canvasNodewh["height"] = res[0].height               this.canvasNodewh["width"] = res[0].width             } else {               this.canvas.width = opts.width               this.canvas.height = opts.height               this.canvasNodewh["height"] = opts.height               this.canvasNodewh["width"] = opts.width             }             this.canvasNodewh["top"] = top 绘画使用： drawStroke(stroke) {     if (stroke.points == null) return;     this.ctx.beginPath();     for (let i = 0; i < stroke.points.length - 1; i++) {       const start = this.normalizePoint(stroke.points[i]);       const end = this.normalizePoint(stroke.points[i + 1]);       this.ctx.moveTo(start.x, start.y);       this.ctx.lineTo(end.x, end.y);     }     this.ctx.closePath();     if (stroke.color) {       this.ctx.strokeStyle = stroke.color;     }     if (stroke.width) {       this.ctx.lineWidth = this.normalizeLineWidth(stroke.width);     }     if (stroke.join) {       this.ctx.lineJoin = stroke.join;     }     if (stroke.cap) {       this.ctx.lineCap = stroke.cap;     }     if (stroke.miterLimit) {       this.ctx.miterLimit = stroke.miterLimit;     }     this.ctx.stroke();   } 使用的主要内容是这些。哪里可能引起在Android手机微信小程序，在开启展示画布一段时间后导致卡死呢？