用代码实现把字符串转换成base64编码

[Sunny]

[beary]

function encode(str){
    const encodestr = encodeURI(str);
    const base64 = btoa(encodestr);
    return base64;
}

[Aurora]

function strToBase64(str) {
      str = encodeURI(str);
      return btoa(str);
}
function base64ToStr(base64) {
      base64 = atob(base64);
      return decodeURI(base64);
}