ts中的?、??、!、!! 下面是?、??、!、!!的基本介绍: 属性或参数中使用?表示该属性或参数为可选项 ??表示只有当左侧为null和undefined时, 才会返回右侧的数 属性或参数中使用!表示表示强制解析（告诉typescript编译器，这里一定有值) ts中的?、??、!、!! 有时候经常分不清楚ts中的?和!, 今天来详细介绍一下。 下面是?、??、!、!!的基本介绍: TypeScript细碎知识点：TS中常见的9种操作符&运算符 🐹 1. 非空断言操作符（!） 在上下⽂中当类型检查器⽆法断定类型时，⼀个新的后缀表达式操作符 ! 可以⽤于断⾔操作对象是⾮ null 和⾮ undefined 类型 🐡 赋值时忽略 null 和 undefined 3、!. 的意思是 断言，告诉ts你这个对象里一定有某个值 注：一般是防止报错使用 项目中具体使用： const inputRef = useRef <HTMLEInputlement> (null); // 定义了输入框，初始化是 null，但是你在调用他的时候相取输入框的 value， 这时候dom实例一定是有值的，所以用断言 Teamspeak 作为专业游戏玩家的第一选择是有原因的。 且不说我们提供的最佳语音质量。且不说我们提供军用级安全性、 I'm highly impressed with @typescriptlang 2.3
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