type Property = 'key1'|'key2' type Person = Record<Property, string>; const p: Person = { key1: "hello", key2: "甜甜", }; Pick 从某个类型中挑出一些属性出来 代码语言:javascript 代码运行次数:0 运行 AI代码解释 type Person = { name: string; age: number; gender: string; }; type...
当TypeScript 第一次引入索引符号时,你只能使用“方括号包括的”元素获取语法(如person["name"])来获取它们声明的属性。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 interfaceSomeType{/** This is an index signature. */[propName:string]:any;}functiondoStuff(value:SomeType){letx=value["somePr...
Interfaces with optional properties are written similar to other interfaces, with each optional property denoted by a ? at the end of the property name in the declaration. 什么是?和Optional Properties呢?interface的某些非required属性名的末尾,添加?这是一个optional property,其实就是字面意思,条件属性。
letz =newMap<Object,string>(); z.set('name','1'); z.set(2,'2');console.log(z.get('name'));console.log(z.get(2));enumTest { A ='aaa', B ='bbb'}letobj: Record<string,number> = { [Test.A]:1,// 枚举中的字符串值[Test.B]:2,// 枚举中的字符串值['value']:3// ...
这是一个类型安全的解决方案,而不是简单地调用let value = obj[key];之类的东西。 从这里getProperty函数很容易调用,如下面的例子所示,从typescript_info对象中获取属性: // the property we will get will be of type Difficultyenum Difficulty { Easy, Intermediate, Hard}// defining the object we will ...
interfacePerson{name:string; age?:number; [propName:string]:string; }lettom:Person= {name:'Tom',age:25,gender:'male'};// index.ts(3,5): error TS2411: Property 'age' of type 'number' is not assignable to string index type 'string'.// index.ts(7,5): error TS2322: Type '{ ...
replace(/<[^>]+>/g, "") } interface params { [propertyName: string]: string | number } /* 解析url参数 */ export const toParams = (params:params):string => { if(params){ let query = []; for(let key in params){ query.push(`${key}=${params[key]}`) } return `${query....
For those cases, SuppressedError has been introduced as a new subtype of Error. It features a suppressed property that holds the last-thrown error, and an error property for the most-recently thrown error. Copy class ErrorA extends Error { name = "ErrorA"; } class ErrorB extends Error {...
userList.value = res.data } </script> // getUserListApi 是一个 Promise 异步函数,Promise 最后只有 成功 / 失败 两种状态 // getUserListApi 是基于 axios 封装的,在 axios 响应拦截器做了处理 // 当 res.success === false 的时候 Promise.reject(), ...
When you are not inlining the source content, you should specify thesourceRootproperty. It can be configured with the following rule: If you don't provide theoutDiroption to TypeScript, thesourceRootoption of gulp-sourcemaps should be the relative path from thegulp.destpath to the source dir...