uniapp上傳圖片轉base64碼

            uni.chooseImage({
                count: 9,
                success: res => {
                    this.imageList = this.imageList.concat(res.tempFilePaths);
                    console.log(res);
                    // this.tempFilePaths = res.tempFilePaths[0];
                    this.urlTobase64(res.tempFilePaths[0]);
                }
            });

        轉base64碼
        urlTobase64(url) {
            uni.request({
                url: url,
                method: 'GET',
                responseType: 'arraybuffer',
                success: res => {
                    let base64 = wx.arrayBufferToBase64(res.data); //把arraybuffer轉成base64
                    base64 = 'data:image/jpeg;base64,' + base64; //不加上這串字符，在頁面無法顯示
                    console.log(base64);
                }
            });
        },