h5-base64
用于base64编解码
{ VERSION: version, atob: atob, btoa: btoa, fromBase64: decode, toBase64: encode, utob: utob, encode: encode, encodeURI: encodeURI, btou: btou, decode: decode, noConflict: noConflict, encodeByteArray: encodeByteArray, decodeToByteArray: decodeToByteArray }