http://www.ruanyifeng.com/blog/2007/10/ascii_unicode_and_utf-8.html
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1：下面是负数存储格式
http://hi.baidu.com/zf2650/item/e390090f1db976c875cd3c1c
http://www.ruanyifeng.com/blog/2007/10/ascii_unicode_and_utf-8.html
-------------------------------------------------------
1：下面是负数存储格式
http://hi.baidu.com/zf2650/item/e390090f1db976c875cd3c1c