模拟CRC循环冗余校验的C语言源程序，不是很完善-simulation Cyclic Redundancy Check the C language source code is not perfect

Consider an 8-input and 8-output problem, where the output should be equal to the input for any of the 8 combinations of seven 0s and one 1.-Consider an 8-input and 8-output problem, where the output should be equal to the input for any of the 8 comb

该遮罩层已经在FF2.0,IE6,Opera测试通过， 以管理员登录为例子 主要配置文件为shade.js，config.js中存放组件的配置，这个文件需要使用者自己配置。 增加拖拽,浏览器窗口缩放时遮罩层自动缩放等功能-The mask layer has been in FF2.0, IE6, Opera test, the administrator login as an example the main configuration file for the shade.j

fft谐波分析的实例，并求出THD即谐波畸变率 -Examples fft harmonic analysis, and find THD