base64和圖片之間的相互轉化

const fsm = wx.getFileSystemManager();
const FILE_BASE_NAME = 'tmp_base64src'; //自定義文件名

function base64src(base64data, cb) {
  console.log(base64data)
  const [, format, bodyData] = /data:image\/(\w+);base64,(.*)/.exec(base64data) || [];
  if (!format) {
    return (new Error('ERROR_BASE64SRC_PARSE'));
  }
  const filePath = `${wx.env.USER_DATA_PATH}/${FILE_BASE_NAME}.${format}`;
  const buffer = wx.base64ToArrayBuffer(bodyData);
  fsm.writeFile({
    filePath,
    data: buffer,
    encoding: 'binary',
    success() {
      cb(filePath);
    },
    fail() {
      return (new Error('ERROR_BASE64SRC_WRITE'));
    },
  });
};




function base64({url,type}) {
  return new Promise((resolve, rejiect) => {
    wx.request({
      url: url,
      responseType: 'arraybuffer',
      success: res => {
        let base64Url = wx.arrayBufferToBase64(res.data); //把arraybuffer轉成base64
        // resolve('data:image/' + type.toLocaleLowerCase() + ';base64,' + base64Url)
        resolve(base64Url)
      }
    });
  })
};

export { base64src, base64 };

調用攝像頭後獲取的本地文件路徑

function base64({ url, type }){
  return new Promise((resolve, reject) => {
    wx.getFileSystemManager().readFile({
      filePath: url, //(本地文件)
      encoding: 'base64', //編碼格式
      success: res => {
        console.log(res.data)
        // resolve('data:image/' + type.toLocaleLowerCase() + ';base64,' + res.data)
        resolve(res.data)
      },
      fail: res => reject(res.errMsg)
    })
  })
};