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JavaScript 运算符 | 菜鸟教程 JavaScript 运算符 JavaScript 运算符用于赋值,比较值,执行算术运算等。 JavaScript 算术运算符 算术运算符用于执行两个变量或值的运算。 赋值 y = 5, 以下表格将向你说明算术运算符的使用: 运算符 描述 例子 y 值 x 值 在线实例 + 加法 x = y + 2 y = 5 x = 7 实例 » - 减法 x = y - 2 y = 5 x = 3 实例 » * 乘法 x