zhiqiang21

移动端H5图片压缩上传

大体的思路是，部分API的兼容性请参照caniuse：

1. 利用FileReader,读取blob对象,或者是file对象，将图片转化为data uri的形式。
2. 使用canvas,在页面上新建一个画布,利用canvas提供的API,将图片画入这个画布当中。
3. 利用canvas.toDataURL()，进行图片的压缩，得到图片的data uri的值
4. 上传文件。

步骤1当中，在进行图片压缩前，还是对图片大小做了判断的，如果图片大小大于200KB时，是直接进行图片上传，不进行图片的压缩，如果图片的大小是大于200KB，则是先进行图片的压缩再上传:

1wErt3r

;SMBDIS.ASM - A COMPREHENSIVE SUPER MARIO BROS. DISASSEMBLY
;by doppelganger (doppelheathen@gmail.com)

;This file is provided for your own use as-is.  It will require the character rom data
;and an iNES file header to get it to work.

;There are so many people I have to thank for this, that taking all the credit for
;myself would be an unforgivable act of arrogance. Without their help this would
;probably not be possible.  So I thank all the peeps in the nesdev scene whose insight into
;the 6502 and the NES helped me learn how it works (you guys know who you are, there's no