真正的仿windows计算器，有连续运算如1+2+3+4,但是不能一直按运算符，可以连续按等于号，如1+2=3再按=就是5再按7-Real imitation windows calculator, there is a continuous operation, such as 1+2+3+4, but not always according to operator, you can continuously by equal numbers, such as 1+2 = 3 then =