飞机一闪而过，就消失了 怎么回事？ [图片] https://developers.weixin.qq.com/minigame/dev/guide/#%E7%BB%98%E5%88%B6%E4%B8%80%E4%B8%AA%E7%9F%A9%E5%BD%A2 代码： const canvas = wx.createCanvas() const context = canvas.getContext('2d') // 创建一个 2d context context.fillStyle = '#1aad19' // 矩形颜色 //context.fillRect(0, 0, 100, 100) // 矩形左上角顶点为(0, 0)，右下角顶点为(100, 100) const { windowWidth, windowHeight } = wx.getSystemInfoSync() function drawRect(x, y) { context.clearRect(0, 0, windowWidth, windowHeight) context.fillRect(x, y, 100, 100) } const rectX = canvas.width / 2 - 50 let rectY = 0 setInterval(function () { drawRect(rectX, rectY++) }, 16) const image = wx.createImage() const imgX = canvas.width / 2 - 50 let imgY = 500 image.src = 'img/plane.png' image.onload = function () { context.drawImage(image, imgX, imgY) } // 存储当前飞机左上角坐标 let touchX = imgX let touchY = imgY wx.onTouchMove(function (res) { context.clearRect(touchX, touchY, 100, 100); // 清除画布上原有的飞机 touchX = res.changedTouches[0].clientX // 重新判断当前触摸点x坐标 touchY = res.changedTouches[0].clientY // 重新判断当前触摸点x坐标 context.drawImage(image, touchX, touchY); }) if (touchX >= rectX - 100 && touchX <= rectX + 100 && touchY >= rectY - 100 && touchY <= rectY + 100) { // 飞机与矩形发生碰撞 wx.showModal({ title: '提示', content: '发生碰撞，游戏结束！' }) } [图片]