### 一元运算符 一元运算符只有一个操作数. - [`delete`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/delete) `delete` 运算符用来删除对象的属性. - [`void`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/void) `void` 运算符表示表达式放弃返回值. - [`typeof`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/typeof) `typeof` 运算符用来判断给定对象的类型. - [`+`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Unary_plus) 一元加运算符将操作转换为Number类型. - [`-`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Unary_negation) 一元减运算符将操作转换为Number类型并取反. - [`~`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators#Bitwise_NOT) 按位非运算符. - [`!`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Logical_Operators#Logical_NOT) 逻辑非运算符.