canvasToTempFilePath本地打包失效

1.直接运行可以触发方法

1. 发行本地打包后,执行不了

   // 点击拍照  
           toDistinguish: debounce(function() {  
               var _this = this; // 选择或拍摄照片  
               uni.chooseImage({  
                   count: 1,  
                   sizeType: ['compressed'],  
                   success: (res) => {  
                       var photo = res; // 获取图片信息 方向  
                       uni.getImageInfo({  
                           src: photo.tempFilePaths[0],  
                           success: (res) => {  
                               var orientation = res.orientation;  
                               var canvasWidth = 375;  
                               var canvasHeight = 288;  
                               var ctx = uni.createCanvasContext('canvas', this);  
                               ctx.translate(canvasWidth / 2, canvasHeight / 2); // 根据图片方向进行旋转  
   
                               switch (orientation) {  
                                   case 'up':  
                                       break;  
   
                                   case 'right':  
                                       ctx.rotate(90 * Math.PI / 180);  
                                       break;  
   
                                   case 'left':  
                                       ctx.rotate(270 * Math.PI / 180);  
                                       break;  
   
                                   case 'down':  
                                       ctx.rotate(180 * Math.PI / 180);  
                                       break;  
                               }  
   
                               ctx.drawImage(res.path, -canvasWidth / 2, -canvasHeight / 2, canvasWidth, canvasHeight);  
                               ctx.draw(false, setTimeout(function() {  
                                   // canvas生成图片  
                                   uni.canvasToTempFilePath({  
                                       canvasId: 'canvas',  
                                       destWidth: canvasWidth,  
                                       destHeight: canvasHeight,  
                                       success: function(res) {  
                                           _this.SET_DISTINGUISHIMG(res.tempFilePath);  
                                           uni.navigateTo({  
                                               url: '../photo_distinguish/photo_distinguish?img=' + res.tempFilePath  
                                           });  
                                       },  
                                       fail: function(res) {  
                                           uni.showToast({  
                                               title: 'fail'  
                                           })  
                                       },  
                                       complete(res) {  
                                           uni.showToast({  
                                               title: 'complete'  
                                           })  
                                       }  
                                   });  
                               }, 1000));  
                           }  
                       });  
                   }  
               });  
           }, 1000, true)