最简单的解决方案是更改onCategoriesChange正在等待的参数类型,使其变为:
functionsetAge(age:string|number){console.log('我的年纪是'+age.toString());} 2、判断类型,分别处理达到函数目的 代码语言:javascript 代码运行次数:0 运行 AI代码解释 functionsetAge(age:string|number){if(typeofage==="string"){console.log('我是字符串');}else{console.log('我是number');}} 类...
functionchangeDirection(direction:'up'|'down'|'left'|'right'){console.log(direction)}changeDirection('left') 参数direction的值只能是up/down/left/right中的任意一个相比与string类型,使用字面类型更加精确、严谨 枚举 枚举的功能类似于字面类型+联合类型组合的功能,也可以表示一组明确的可选值枚举:定义一组...
}//使用组件type IProps ={ name: string; age: number; };<MyComponent<IProps> name="React" age={18} />; //Success<MyComponent<IProps> name="TypeScript" age="hello" />; // Error 2. 函数组件 通常情况下,函数组件我是这样写的: interface IProps { name: string } const App= (props...
JS 有类型(比如,number/string 等),但是JS 不会检查变量的类型是否发生变化,而 TS 会检查 TypeScript 类型系统的主要优势:可以显示标记出代码中的意外行为,从而降低了发生错误的可能性 示例代码: let age = 18let age: number = 18 说明:代码中的: number就是类型注解 ...
Uncapitalize<StringType>:将字符串首字母转为小写格式 type UppercaseGreeting = "HELLO WORLD"; type UncomfortableGreeting = Uncapitalize<UppercaseGreeting>; // 相当于 type UncomfortableGreeting = "hELLO WORLD" typescript 本文系转载,阅读原文 https://zhuanlan.zhihu.com/p/640499290 ...
string): void; function culture(): { name: string; calendar: { AM: string[]; PM: string[]; days: { names: string[]; namesAbbr: string[]; namesShort: string[]; firstDay: number; }; months: { names: string[]; namesAbbr: string[]; }; patterns: { D: string; F: string; G:...
Type '[string, number, string]' is not assignable to type '[string, number]'. */ Any (任意值) any与类型系统中的任何类型都兼容。意味着可以将任何内容赋值给它,也可以将它赋值给任何类型。它能让你避开类型检查。 let variable: any = 'a string'; ...
slice(5, 7)) + "," + (opacity || "1") + ")"; } // 去除html标签 export const htmlSafeStr = (str:string):string => { return str.replace(/<[^>]+>/g, "") } interface params { [propertyName: string]: string | number } /* 解析url参数 */ export const toParams = (...
For more information,see the change here. Improved Checking Against Template Strings with Interpolations TypeScript now more accurately checks whether or not strings are assignable to the placeholder slots of a template string type. Copy functiona<Textends{id:string}>() {letx:`-${keyof T &...