均值方差计算器，可以计算输入的或者载入的一个由回车分隔开的一组数字的均值和方差-Mean and variance calculator can calculate the input or load separated by a carriage return a set of numbers mean and variance

javascr ipt 几个简单源代码,有计算器,分时问候,闪烁效果-Some simple javascr ipt source code, a calculator, time-sharing greetings, flashing effect