小程序base64與buffer的總結

1.后台中字符轉base64

 const buffer = Buffer.from(userInfo.nickName);
 let nickname = buffer.toString('base64');

2.后台中base64轉字符

var buffer = new Buffer.from(user_info.nickname, 'base64')
nickName = buffer.toString();

3.base64轉圖片

需要在開始加上'data:image/png;base64,' +經行拼接