用 Buffer 转换一下

> var b1 = new Buffer('abc123')
> b1
<Buffer 61 62 63 31 32 33>
> Buffer.prototype.toByteArray = function () {
...   return Array.prototype.slice.call(this, 0)
... }
> b1.toByteArray()
[ 97,
  98,
  99,
  49,
  50,
  51 ]
>