需求很简单代码也很简单，就是效果出不来，心好累。。。老铁们，怎么办
takePhoto() {
this.data.camera.takePhoto({
quality: 'high',
success: (res) => {
let cv = wx.createCanvasContext("abc"); //canvas-id='abc'
let w = this.data.canvasW; //<canvas>宽
let h = this.data.canvasH;
cv.drawImage(res.tempImagePath, 0, 0, w, h); //res.tempImagePath是http://tmp/xxx.jpg
cv.draw();
}
})
},
没报错，但是canvas画不了图片，开发者工具出不来效果
你在手机上测试，以手机为准
报的什么错，我这测试没问题
wxml:
<cameradevice-position="back"flash="off"binderror="error"style="width: 100%; height: 300px;"></camera><buttontype="primary"bindtap="takePhoto">拍照</button><canvascanvas-id="abc"style="width:100%;height:350rpx;"></canvas>js:
Page({data: {canvasW:350,canvasH:350},onLoad:function(options) {this.camera = wx.createCameraContext()},takePhoto:function(e) {this.camera.takePhoto({quality:'high',success: (res) => {let cv = wx.createCanvasContext("abc");//canvas-id='abc'let w =this.data.canvasW;//<canvas>宽let h =this.data.canvasH;cv.drawImage(res.tempImagePath, 0, 0, w, h);//res.tempImagePath是http://tmp/xxx.jpgcv.draw();}})}})创建 canvas 绘图上下文（指定 canvasId）。在自定义组件下，第二个参数传入组件实例this，以操作组件内
<canvas/>组件let cv = wx.createCanvasContext("abc",this);//canvas-id='abc'可以了，谢啦。老司机就是稳当，666啊