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TypeScript 从零实现 axios

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https://yangchaojie.github.io/

A comprehensive guide and implementation of the axios library using TypeScript. The documentation covers TypeScript fundamentals (interfaces, classes, generics, and advanced types), the design and implementation of core axios features such as interceptors, request/response handling, baseURL, and request cancellation, as well as detailed unit testing for the ts-axios modules.

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What's inside ts-axios

  1. Introduction to the Symbol primitive type

    ES6 introduced Symbol, a new primitive data type representing a unique value. It is used primarily to ensure that object property names are unique, preventing collisions when adding methods to objects (e.g., in mixin patterns).

    Key characteristics:

    • Symbols are created using the Symbol() function.
    • They are primitive values, not objects; therefore, you cannot add properties to them.
    • The Symbol() function must NOT be called with the new operator.
    • Every Symbol created is guaranteed to be unique, even if they are initialized with the same description.
    let s = Symbol();
typeof s; // "symbol"

// Symbols with the same description are NOT equal
let s1 = Symbol('foo');
let s2 = Symbol('foo');
s1 === s2; // false

  2. Overview of Weex framework

    Weex is a cross-platform framework by Alibaba that allows developers to build Android, iOS, and Web applications using common web development languages and JavaScript. By integrating the WeexSDK, developers can apply web development experience to create mobile applications.

  3. Overview of Xamarin for cross-platform development

    Xamarin is an open-source platform used to build high-performance applications for iOS, Android, and Windows using .NET. It acts as an abstraction layer managing communication between shared code and platform-specific code, running in a managed environment with automatic memory allocation and garbage collection. Developers can share approximately 90% of their application code, writing business logic in one language while maintaining native performance and appearance. Applications are compiled into native packages such as .apk for Android and .ipa for iOS.

  4. Overview of the Reflect API

    The Reflect object provides a set of static methods for intercepting JavaScript fundamentals. Its primary design goals are:

    1. To move internal language methods (like Object.defineProperty) to a dedicated Reflect object.
    2. To improve return values for consistency (e.g., Reflect.defineProperty returns a boolean instead of throwing an error).
    3. To turn imperative object operations (like the in operator or delete keyword) into function calls.
    4. To provide a 1:1 mapping with Proxy handlers, allowing developers to easily implement default behavior within a proxy.

  5. Overview of ES6 Module Design

    ES6 modules are designed for static analysis, meaning dependency relationships and input/output variables are determined at compile-time rather than runtime. This allows for better optimization (static optimization) and enables features like macros and type systems. Unlike CommonJS, which loads modules as objects at runtime, ES6 modules use explicit export and import commands to define interfaces.

  6. Overview of SIMD in JavaScript

    SIMD (Single Instruction/Multiple Data) is a JavaScript interface that allows a single instruction to perform operations on multiple data points (called 'lanes') simultaneously. This is significantly more efficient than the default SISD (Single Instruction/Single Data) mode, making it ideal for computationally intensive tasks such as 3D graphics, physical simulations, image processing, and cryptography.
    // SISD (Standard) - 4 operations
var a = [1, 2, 3, 4];
var b = [5, 6, 7, 8];
var c = [];
c[0] = a[0] + b[0];
c[1] = a[1] + b[1];
c[2] = a[2] + b[2];
c[3] = a[3] + b[3];

// SIMD - 1 operation
var a = SIMD.Float32x4(1, 2, 3, 4);
var b = SIMD.Float32x4(5, 6, 7, 8);
var c = SIMD.Float32x4.add(a, b); // Float32x4[6, 8, 10, 12]

  7. Overview of MongoDB Document Model

    MongoDB is a document-oriented database where records are stored as documents. These documents are data structures composed of field-value pairs, similar to JSON objects. Values can be scalars, other documents (embedded documents), arrays, or arrays of documents. Documents are grouped into collections, which are analogous to tables in relational databases.

    Key advantages of the document model include:

    1. Direct mapping to native data types in most programming languages.
    2. Reduced need for expensive joins through the use of embedded documents and arrays.
    3. Support for fluent polymorphism via a dynamic schema.
    {
    "name": "yang",
    "age": 26,
    "status": "A",
    "group": ["news", "sports"]
}

  8. Overview of TypeScript features and benefits

    TypeScript is a superset of JavaScript that adds optional type annotations to enhance code readability and maintainability. It allows developers to build robust components by providing the latest evolving JavaScript features and compiling them down to clean JavaScript compatible with any browser, Node.js, or ECMAScript 3+ engine.

    Key advantages include:

    • Tooling for Large Applications: Static checking and code refactoring tools enabled by types help manage large-scale software components and interfaces.
    • Type Inference: Types are optional, and type inference allows for static verification without requiring exhaustive manual annotations.
    • Modern JS Support: Supports the latest ECMAScript features and future proposals, such as async functions and Decorators.

  9. Overview of Object static methods

    Static methods are defined directly on the Object constructor. They are categorized by their purpose:

    Property Model Methods:

    • Object.getOwnPropertyDescriptor(): Gets the descriptor object for a specific property.
    • Object.defineProperty(): Defines a property using a descriptor.
    • Object.defineProperties(): Defines multiple properties using descriptors.

    Object State Control:

    • Object.preventExtensions(): Prevents new properties from being added.
    • Object.isExtensible(): Checks if an object can be extended.
    • Object.seal(): Prevents adding/removing properties and makes existing properties non-configurable.
    • Object.isSealed(): Checks if an object is sealed.
    • Object.freeze(): Makes an object immutable (prevents all changes).
    • Object.isFrozen(): Checks if an object is frozen.

    Prototype Chain Methods:

    • Object.create(): Creates a new object with a specified prototype.
    • Object.getPrototypeOf(): Retrieves the prototype of an object.

  10. Understand TypedArray characteristics

    TypedArrays are views that provide a way to read and write binary data in an ArrayBuffer. Unlike standard JavaScript arrays, TypedArrays have the following characteristics:

    • All members are of the same type.
    • Members are contiguous in memory (no empty slots).
    • Default values for members are 0.
    • They do not store data themselves; they are views into an underlying ArrayBuffer object, accessible via the .buffer property.

  11. Compare Native vs. Cross-Platform Mobile Development

    Native development requires separate codebases for Android (Java/Kotlin) and iOS (Objective-C/Swift), leading to higher costs and longer development cycles. Cross-platform development aims to reduce these costs and ensure consistency across platforms, though it typically results in lower performance, larger bundle sizes, and a slightly degraded user experience compared to native apps.

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