$ tsc hello.ts hello.ts(15,20):error TS2345:Argumentof type'{ width: number; height: number; }'isnotassignable to parameter of type'Shape'.Property'name'ismissingintype'{ width: number; height: number; }'. 浏览器访问,输出结果如下: 箭头函数表达式(lambda表达式) lambda表达式()=>{somethin...
p.age,p.friend);// 结果:tom 18 { name: 'jerry' }// p.friend = {name:'lisi'}; // 报错: cannot assign to 'friend' because it is a read-only property.if(p.friend) {
不过，此时的默认参数只起到参数默认值的作用，如下代码所示：function log1(x: string = 'hello') {console.log(x);}// ts(2322) Type 'string' is not assignable to type 'number'function log2(x: number = 'hello') {console.log(x);}log2();log2(1);log2('1'); // ts(2345) Argument...
NAME= "Haha";//Uncaught TypeError: Assignment to constant variableconst obj ={ name:"TypeScript"}; obj.name= "Haha"; interface Info { readonly name: string; } const info: Info={ name:"TypeScript"}; info["name"] = "Haha";//Cannot assign to 'name' because it is a read-only pro...
// 定义人的接口interface IPerson {readonly id: number;age: number;}interface IPerson {name: string;sex: string;}const person2: IPerson = {//报错id: 2,name: "tom",age: 20,};会有报错信息：Property 'sex' is missing in type '{ id: number; name: string; age: number; }' but ...
// 元组类型:限定了数组成员的类型和个数lettuple:[number,string]=[1,'2']lettuple:[number,string]=["1","2"]// 报错:Type 'string' is not assignable to type 'number'.lettuple:[number,string]=[1,"2",3]// 报错:Types of property 'length' are incompatible.Type '3' is not assignable...
本文是阅读小册「《深入浅出TypeScript》」的阅读笔记,对TypeScript感兴趣的同学请继续阅读吧。 原始类型 「TypeScript」的原始类型包括:「boolean、number、string、void、undefined、null、symbol、bigint。」 需要注意的是,number是类型,而Number是构造函数。
hello.ts(15,20):error TS2345:Argumentof type'{ width: number; height: number; }'isnotassignable to parameter of type'Shape'.Property'name'ismissingintype'{ width: number; height: number; }'. 浏览器访问,输出结果如下: 箭头函数表达式(lambda表达式) ...
class MyClass {/*** This event is fired whenever the application navigates to a new page.* @eventProperty*/public readonly navigatedEvent: FrameworkEvent<NavigatedEventArgs>;} 1.2.7@example 指示应作为示例演示如何使用 API 的文档部分。 它可能包括代码示例。
import{Vue,Component,Emit}from'vue-property-decorator'@ComponentexportdefaultclassMyComponentextendsVue{count=0@Emit()addToCount(n:number){this.count+=n}@Emit('reset')resetCount(){this.count=0}@Emit()returnValue(){return10}@Emit()onInputChange(e){returne.target.value}@Emit()promise(){return...