通用初等函数计算器，在网页上模拟出键盘的风格，程序主要是进行数学运算，不但包括最基本的加减乘除运算，还有平方根、立方根、正弦、余弦运算，以及一些更复杂的数学函数。本计算器运行于PHP环境，更多功能希望与大家一起完善。 -Universal primary function calculator on the web simulated keyboard style, the program is mainly for mathematical operations, including not only the basic arithmetic operations, as well as square root, cube root, sine, cosine operations, as well as some of the more complex mathematical functions . The calculator runs on PHP environment, more features and we hope to improve together.