在 TypeScript 中，我们只需要在函数的第一个参数中声明 this 指代的对象（即函数被调用的方式）即可，比如最简单的作为对象的方法的 this 指向，如下代码所示：function say(this: Window, name: string) {console.log(this.name);}window.say = say;window.say('hi');const obj = {say};obj.say('hi')...
<script lang="ts"> import { Component, Prop, Vue } from "vue-property-decorator"; @Component export default class Hello extends Vue { @Prop({ required: true }) private msg!: string; featrues = ['类型注释', 'balabala']; addFeatrue(e:any){ this.featrues.push(e.target.value); e...
// 在 adapters 目录下的 xhr.ts 文件中: if ('setRequestHeader' in requestHeaders) { // 通过 XHR 的 setRequestHeader 方法设置请求头信息 for (const key in requestHeaders) { if (requestHeaders.hasOwnProperty(key)) { const val = requestHeaders[key]; if ( typeof requestData === '...
let xhr = new XMLHttpRequest(); // 假设当前 window.location.host 为 http://localhost:1234 xhr.open('get', ''); // http://localhost:1234/ xhr.open('get', '/'); // href http://localhost:1234/ xhr.open('get', null); // http://localhost:1234/null xhr.open('get', undefined...
typeactions='add'|'remove';typeproperty='name'|'phone';typeresult=`${actions}${Capitalize<property>}`;// type result = addName | addPhone | removeName | removePhone 1. 2. 3. 4. 类型推断 在上面的例子中,我们使用使用模版字面量类型将现有的类型组合成新类型。下面来看看如何使用模板字面量...
大Object :代表所有拥有 toString、hasOwnProperty 方法的类型,所以所有原始类型、非原始类型都可以赋给 Object,严格模式下不包括null,undefined。{}空对象类型和大 Object 一样。 let obj1: Object = 3; let obj2: Object = "3"; let obj6: Object = Symbol(); ...
typeUppercaseProperty = Uppercase<property>; // type UppercaseProperty = 'Property'; 下面来看一个更复杂的场景,将字符串字面量类型与这些实用程序结合使用。将两种类型进行组合,并将第二种类型的首字母大小,这样组合之后的类型符合驼峰命名法: typeactions ='add'|'remove'; ...
Declaring a new property in the Window Depending on the way you code and the TypeScript version that you use, there are 2 ways to add a new property to the window: 1. With an interface To add a new property and prevent any compile error, you can use an interface to describ...
In the Project tool window Alt01, select the folder where your TypeScript code is (most often it is the project root folder) and then select New | tsconfig.json File from the context menu. To generate source maps during compilation, make sure the sourceMap property is set to true. Optiona...
//序列化 toJSON(): any { const obj = {}; Object.keys(this).forEach( property => { const serialize = Reflect.getMetadata(SerializeMetaKey, this, property); if (serialize) { if (this[property] instanceof Element) { obj[serialize] = this[property].toJSON(); } else { obj[serialize...