let imageData: ArrayBuffer
let base64 = new util.Base64Helper(); // 实例化Base64Helper
let data = base64.encodeSync(new Uint8Array(imageData.slice(0, imageData.byteLength))) // 转换成Uint8Array
console.info(`data长度:${data.length}`)
console.info(`data:${data}`)
let textDecoder = util.TextDecoder.create('utf-8', { ignoreBOM : true })
let retStr = textDecoder.decodeWithStream( data , {stream: false}); // 可以把Uint8Array转码成base64
ImagePacker获取的arrayBuffer可以转为base64,参考demo: