orderSystemJp/raising-large-screen/utils/base64src.js

const fsm = wx.getFileSystemManager();
const FILE_BASE_NAME = 'tmp_base64src'; //自定义文件名
function base64src(base64data, cb) {
	let fileName = FILE_BASE_NAME + new Date().getTime();
  base64data = base64data.replace(/[\r\n]/g, '');
  const filePath = `${wx.env.USER_DATA_PATH}/${fileName}`;
  fsm.unlink({
    filePath: filePath,
    fail: res => {
      console.log(res);
    },
    complete: res => {
      const buffer = wx.base64ToArrayBuffer(base64data);
      fsm.writeFile({
        filePath: filePath,
        data: buffer,
        encoding: 'base64',
        success: res => {
          cb(filePath);
        },
        fail: res => {
          return new Error('ERROR_BASE64SRC_WRITE');
        }
      });
    }
  });
}
export { base64src };