https://books.google.com.hk/books?id=AkGbAgAAQBAJ&pg=PA47&lpg=PA47&dq=javascript+downloads+files+in+the+form+of+byte+stream&source=bl&ots=APGvfCsXcY&sig=ACfU3U037-V5G47-KGi-5j6mV8lOR_2r5A&hl=zh-CN&sa=X&redir_esc=y&sourceid=cndr#v=onepage&q=javascript downloads files in the form of byte stream&f=false
