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### 算术运算符 算术运算符以二个数值(字面量或变量)作为操作数,并返回单个数值。 - [`+`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Addition) 加法运算符. - [`-`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Subtraction) 减法运算符. - [`/`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Division) 除法运算符. - [`*`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Multiplication) 乘法运算符. - [`%`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Remainder) 取模运算符.