wx.chooseImage({                     count: 1, // 默认9                     sizeType: ['compressed'], // 'original', 'compressed' 指定是原图还是压缩图，默认都有                     sourceType: ['album', 'camera'], // 指定来源是相册还是相机，默认都有                     success: res => {                       this.localIds = res.localIds[0]; // 返回选定照片的本地ID列表，localId可以作为img标签的src属性显示图片                       wx.getLocalImgData({                         localId: res.localIds[0], //获取本地图片接口                         success: res => {                               this.dialog(res.localData); //ios没有base64,返回的res里面也是空的                                               },                         fail: res => {                           this.loading = 0;                           this.dialog('图片上传失败，请重试');                         },                         cancel: res => {                           this.loading = 0;                           // this.dialog('取消上传');                         }                       });                     },                     fail: res => {                       this.loading = 0;                       this.dialog('图片上传失败，请重试!');                     },                     cancel: res => {                       this.loading = 0;                       // this.dialog('取消上传!');                     }                   });