【鸿蒙NEXT】base64和string转换

import util from '@ohos.util';

base64Decode(base64Str: string): string {
    try {
      let arr = new util.Base64Helper().decodeSync(base64Str)
      let str = this.uint8ArrayToString(arr)
      return str
    } catch (err) {
      QDLogUtils.error(`base64Decode err = ${err}`)
    }
    return ''
  }

base64Encode(array: Uint8Array): string {
    try {
      let arr = new util.Base64Helper().encodeSync(array)
      let str = this.uint8ArrayToString(arr)
      return str
    } catch (err) {
      QDLogUtils.error(`base64Encode err = ${err}`)
      return ''
    }
  }
  
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string和Uint8Array相互转换