用 Javascr ipt 编写一个简单的计算器。实现一个标准型计算器的基本功能；实现加，减，乘，除，取余，开平方，求倒数等基本运算； 支持正负号，小数点输入；实现Backspace, CE, C键的功能；-A simple calculator written in Javascr ipt. Achieve the basic functions of a standard calculator addition, subtraction, multiplication, divisio

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