关于原始typescript实现todolist笔记(装饰器模式)

前言

我是歌谣最好的种树是十年前其次是现在今天继续给大家带来的是原始typescript的讲解

环境配置

npm init -y

yarn add vite -D

修改page.json配置端口

{
  "name": "react_ts",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "dev": "vite --port 3002",
    "server":"ts-node-dev ./server/app.ts"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@types/express": "^4.17.17",
    "@types/jquery": "^3.5.18",
    "express": "^4.18.2",
    "jquery": "^3.7.1",
    "ts-node-dev": "^2.0.0",
    "typescript": "^5.2.2",
    "vite": "^4.4.9"
  }
}

后端部分

app.ts

import express, { Application } from "express"
import { readFileSync } from "fs"
import { resolve } from "path"
import bodyParse from "body-parser"
import { fileOperation, readFile, writeFile } from "./utils"
import { ITodoData } from "../src/typings"
const app: Application = express()


app.use(bodyParse.urlencoded({ extended: true }))
app.use(bodyParse.json())


app.all('*', (req, res, next) => {
    res.header('Access-Control-Allow-Origin', "*")
    res.header('Access-Control-Allow-Methods', "POST,GET,PUT,DELETE")
    next();
})


app.get('/todolist', (req, res) => {
    const todoList = fileOperation('todo.json') as string
    console.log(todoList)
    res.send(todoList)
})
app.post('/toggle', (req, res) => {
    const id: number = parseInt(req.body.id)
    //    let todoList:ITodoData[]=JSON.parse(readFile('todo.json')||'[]')
    //    todoList=todoList.filter((todo:ITodoData)=>todo.id!==id)
    //    writeFile("todo.json",todoList)
    fileOperation("todo.json", function (todoList: ITodoData[]) {
        return todoList.map((todo: ITodoData) => {
            if (todo.id === id) {
                todo.completed = !todo.completed
            }
            return todo
        })
    })
    res.send({
        msg: "ok",
        statusCode: "200"
    })
})
app.post('/remove', (req, res) => {
    const id: number = parseInt(req.body.id)
    //    let todoList:ITodoData[]=JSON.parse(readFile('todo.json')||'[]')
    //    todoList=todoList.filter((todo:ITodoData)=>todo.id!==id)
    //    writeFile("todo.json",todoList)
    fileOperation("todo.json", function (todoList: ITodoData[]) {
        return todoList.filter((todo: ITodoData) => todo.id !== id)
    })
    res.send({
        msg: "ok",
        statusCode: "200"
    })
})


app.post('/add', (req, res) => {
    const todo: ITodoData = JSON.parse(req.body.todo);
    fileOperation("todo.json", function (todoList: ITodoData[]) {
        const isExis = todoList.find((t: ITodoData) => {
            t.content === todo.content
        })
        if (isExis) {
            res.send({
                msg: "exist",
                statusCode: "100"
            })
            return
        }
        todoList.push(todo)
        return todoList
    })
    res.send({
        msg: "ok",
        statusCode: "200"
    })
})


app.listen(3003, () => {
    console.log("ok")
})

todo.json

[{"id":4,"content":"歌谣","completed":false}]

untils.ts

import {readFileSync,writeFileSync} from "fs"
import {resolve} from "path" 
import { ITodoData } from "../src/typings"
export function readFile(path:string):string{
    return readFileSync(resolve(__dirname,path),"utf8")
}
export function writeFile<T>(path:string,data:T):void{
    writeFileSync(resolve(__dirname,path),JSON.stringify(data))
}


export function fileOperation(path:string,fn?:any):string|void{
    let todoList:ITodoData[]=JSON.parse(readFile('todo.json')||'[]')
    if(!fn){
        return JSON.stringify(todoList)
    }
    todoList=fn(todoList)
    writeFile<ITodoData[]>(path,todoList)
}


export function remove(path:string,fn?:any):string|void{
    let todoList:ITodoData[]=JSON.parse(readFile('todo.json')||'[]')
    if(!fn){
        return JSON.stringify(todoList)
    }
    todoList=fn(todoList)
    writeFile<ITodoData[]>(path,todoList)
}

todoserver.ts

import $ from 'jquery'
import { ITodoData } from './typings'


export function getTodoList(
    target: any,
    methodName: string,
    descriptor: PropertyDescriptor
): void {
    console.log(target, methodName, descriptor)
    const _origin = descriptor.value
    descriptor.value = function (todoData: ITodoData[]) {
        $.get("http://localhost:3003/todolist").then((res: string) => {
            if (!res) {
                return
            }
            todoData = JSON.parse(res)
        }).then(() => {
            _origin.call(this, todoData)
        })
    }
}


export function removeTodo(target: any,
    methodName: string,
    descriptor: PropertyDescriptor): void {
       
        const _origin = descriptor.value
        descriptor.value = function (target: HTMLElement,id:number) {
            $.post("http://localhost:3003/remove",{id}).then((res: string) => {
                _origin.call(this, target,id)
            })
        }
}


export function toggleTodo(target: any,
    methodName: string,
    descriptor: PropertyDescriptor): void {
        const _origin = descriptor.value
        descriptor.value = function (target: HTMLElement,id:number) {
            $.post("http://localhost:3003/toggle",{id}).then((res: string) => {
                _origin.call(this, target,id)
            })
        }
}


export function addTodo(target: any,
    methodName: string,
    descriptor: PropertyDescriptor): void {
        const _origin = descriptor.value
        descriptor.value = function (todo:ITodoData[]) {
            $.post("http://localhost:3003/add",{todo:JSON.stringify(todo)}).then((res: any) => {
                if(res.statusCode==="100"){
                    alert("该项已经存在")
                    return 
                }
                _origin.call(this, todo)
            })
        }
}

前端

app.ts

import { ITodoData } from "./typings";
import TodoEvent from "./TodoEvent";
; ((doc) => {
    const oInput: HTMLInputElement = document.querySelector('input') as HTMLInputElement
    const oAddBtn: HTMLElement = document.querySelector('button') as HTMLElement
    const oTodoList: HTMLElement = document.querySelector('.todo-list') as HTMLElement


    const todoData: ITodoData[] = [
        {
            id: 1,
            content: 'geyao',
            completed: false
        },
        {
            id: 2,
            content: 'fangfang',
            completed: false
        },
        {
            id: 3,
            content: 'kang',
            completed: false
        }
    ]


    const init = (): void => {
        bindEvent()
    }


    function bindEvent(): void {
        oAddBtn.addEventListener("click", handleAddBtnClick, false)
        oTodoList.addEventListener("click", handleListClick, false)
    }
    function handleAddBtnClick(): void {
        const val:string=oInput.value.trim()
        console.log(val,"val is")
        if(val.length){
           const ret= todoEvent.addTodo(<ITodoData>{
                id: 4,
                content: val,
                completed: false
            })
            if(ret&&ret===1001){
                alert("列表已经存在")
                return
            }
            oInput.value=''
        }
       
   
    }
    function handleListClick(e: MouseEvent): void {
        const tar = e.target as HTMLElement
        const tagName = tar.tagName.toLowerCase()
        if (tagName === 'input' || tagName === 'button') {
            const id=parseInt(tar.dataset.id as string)
            switch (tagName) {
                case 'input':
                    todoEvent.toggleComplete(tar,id)
                    break;
                case 'button':
                    todoEvent.removeTodo(tar,id)
                    break;
                default:
                    break;
            }
        }
    }
    const todoEvent: TodoEvent = new TodoEvent(todoData,oTodoList)
    init()


})(document)

todoDom.ts

import TodoTemplate from "./TodoTemplate";
import { ITodoData } from "./typings";
import { createItem, findParentNode } from "./utils";


class TodoDom extends TodoTemplate{
    private todoWarpper:HTMLElement;
    constructor(todoWarpper:HTMLElement){
        super()
        this.todoWarpper=todoWarpper
    }
    protected initList(todoData:ITodoData[]){
        if(todoData.length){
            const oFrag:DocumentFragment=document.createDocumentFragment()
            todoData.map((todo:ITodoData)=>{
               const oItem:HTMLElement= createItem("div","todo-item",this.todoView(todo))
                // const oItem:HTMLElement=document.createElement("div")
                // oItem.className='todo-item'
                // oItem.innerHTML=this.todoView(todo)
                 oFrag.appendChild(oItem)
            })
            this.todoWarpper.appendChild(oFrag)
        }
    }
    protected addItem(todo:ITodoData){
        const oItem:HTMLElement= createItem("div","todo-item",this.todoView(todo))
    //    const oItem:HTMLElement=document.createElement('div');
    //    oItem.className='todo-item'
    //    oItem.innerHTML=this.todoView(todo)
       this.todoWarpper.appendChild(oItem)
    }
    protected removeItem(target:HTMLElement){
        const oParentNode:HTMLElement=findParentNode(target,"todo-item");
        oParentNode.remove()
    }
    protected changeCompleted(target:HTMLElement,completed:boolean){
        const oParentNode:HTMLElement=findParentNode(target,"todo-item");
        const oContent:HTMLElement=oParentNode.getElementsByTagName("span")[0]
        oContent.style.textDecoration=completed?'line-through':"none"
    }
}




export default TodoDom

todoTemplate.ts

import { ITodoData } from "./typings";


class TodoTemplate{
   protected todoView({id,content,completed}:ITodoData):string{
      return `
      <input type="checkbox" ${completed}?'checked':'' data-id="${id}"/>
      <span style="text-decoration":${completed}?'line-through':'none'>${content}</span>
      <button data-id='${id}'>删除</button>
      `
   }
}


export default TodoTemplate

untils.ts

import { callbackify } from "util"


export function findParentNode(target:HTMLElement,className:string):any{
    while(target=target.parentNode as HTMLElement){
        if(target.className===className){
            return target 
        }
    }
}


export function createItem(tagName:string,className:string,todoItem:string):HTMLElement{
    const oItem:HTMLElement=document.createElement(tagName)
    oItem.className=className
    oItem.innerHTML=todoItem
    return oItem
}

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Ts</title>
</head>
<body>
    <div class="app">
        <div class="todo-input">
            <input type="text" placeholder="请输入代办事项">
            <button>增加</button>
        </div>
        <div class="todo-list"></div>
    </div>
     <script type="module" src="./src/app.ts"></script> 
</body>
</html>

tsconfig.json

{
  "compilerOptions": {
    /* Visit https://aka.ms/tsconfig to read more about this file */


    /* Projects */
    // "incremental": true,                              /* Save .tsbuildinfo files to allow for incremental compilation of projects. */
    // "composite": true,                                /* Enable constraints that allow a TypeScript project to be used with project references. */
    // "tsBuildInfoFile": "./.tsbuildinfo",              /* Specify the path to .tsbuildinfo incremental compilation file. */
    // "disableSourceOfProjectReferenceRedirect": true,  /* Disable preferring source files instead of declaration files when referencing composite projects. */
    // "disableSolutionSearching": true,                 /* Opt a project out of multi-project reference checking when editing. */
    // "disableReferencedProjectLoad": true,             /* Reduce the number of projects loaded automatically by TypeScript. */


    /* Language and Environment */
    "target": "es2016",                                  /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
    // "lib": [],                                        /* Specify a set of bundled library declaration files that describe the target runtime environment. */
    // "jsx": "preserve",                                /* Specify what JSX code is generated. */
     "experimentalDecorators": true,                   /* Enable experimental support for legacy experimental decorators. */
     "emitDecoratorMetadata": true,                    /* Emit design-type metadata for decorated declarations in source files. */
    // "jsxFactory": "",                                 /* Specify the JSX factory function used when targeting React JSX emit, e.g. 'React.createElement' or 'h'. */
    // "jsxFragmentFactory": "",                         /* Specify the JSX Fragment reference used for fragments when targeting React JSX emit e.g. 'React.Fragment' or 'Fragment'. */
    // "jsxImportSource": "",                            /* Specify module specifier used to import the JSX factory functions when using 'jsx: react-jsx*'. */
    // "reactNamespace": "",                             /* Specify the object invoked for 'createElement'. This only applies when targeting 'react' JSX emit. */
    // "noLib": true,                                    /* Disable including any library files, including the default lib.d.ts. */
    // "useDefineForClassFields": true,                  /* Emit ECMAScript-standard-compliant class fields. */
    // "moduleDetection": "auto",                        /* Control what method is used to detect module-format JS files. */


    /* Modules */
    "module": "commonjs",                                /* Specify what module code is generated. */
    // "rootDir": "./",                                  /* Specify the root folder within your source files. */
    // "moduleResolution": "node10",                     /* Specify how TypeScript looks up a file from a given module specifier. */
    // "baseUrl": "./",                                  /* Specify the base directory to resolve non-relative module names. */
    // "paths": {},                                      /* Specify a set of entries that re-map imports to additional lookup locations. */
    // "rootDirs": [],                                   /* Allow multiple folders to be treated as one when resolving modules. */
    // "typeRoots": [],                                  /* Specify multiple folders that act like './node_modules/@types'. */
    // "types": [],                                      /* Specify type package names to be included without being referenced in a source file. */
    // "allowUmdGlobalAccess": true,                     /* Allow accessing UMD globals from modules. */
    // "moduleSuffixes": [],                             /* List of file name suffixes to search when resolving a module. */
    // "allowImportingTsExtensions": true,               /* Allow imports to include TypeScript file extensions. Requires '--moduleResolution bundler' and either '--noEmit' or '--emitDeclarationOnly' to be set. */
    // "resolvePackageJsonExports": true,                /* Use the package.json 'exports' field when resolving package imports. */
    // "resolvePackageJsonImports": true,                /* Use the package.json 'imports' field when resolving imports. */
    // "customConditions": [],                           /* Conditions to set in addition to the resolver-specific defaults when resolving imports. */
    // "resolveJsonModule": true,                        /* Enable importing .json files. */
    // "allowArbitraryExtensions": true,                 /* Enable importing files with any extension, provided a declaration file is present. */
    // "noResolve": true,                                /* Disallow 'import's, 'require's or '<reference>'s from expanding the number of files TypeScript should add to a project. */


    /* JavaScript Support */
    // "allowJs": true,                                  /* Allow JavaScript files to be a part of your program. Use the 'checkJS' option to get errors from these files. */
    // "checkJs": true,                                  /* Enable error reporting in type-checked JavaScript files. */
    // "maxNodeModuleJsDepth": 1,                        /* Specify the maximum folder depth used for checking JavaScript files from 'node_modules'. Only applicable with 'allowJs'. */


    /* Emit */
    // "declaration": true,                              /* Generate .d.ts files from TypeScript and JavaScript files in your project. */
    // "declarationMap": true,                           /* Create sourcemaps for d.ts files. */
    // "emitDeclarationOnly": true,                      /* Only output d.ts files and not JavaScript files. */
    // "sourceMap": true,                                /* Create source map files for emitted JavaScript files. */
    // "inlineSourceMap": true,                          /* Include sourcemap files inside the emitted JavaScript. */
    // "outFile": "./",                                  /* Specify a file that bundles all outputs into one JavaScript file. If 'declaration' is true, also designates a file that bundles all .d.ts output. */
    // "outDir": "./",                                   /* Specify an output folder for all emitted files. */
    // "removeComments": true,                           /* Disable emitting comments. */
    // "noEmit": true,                                   /* Disable emitting files from a compilation. */
    // "importHelpers": true,                            /* Allow importing helper functions from tslib once per project, instead of including them per-file. */
    // "importsNotUsedAsValues": "remove",               /* Specify emit/checking behavior for imports that are only used for types. */
    // "downlevelIteration": true,                       /* Emit more compliant, but verbose and less performant JavaScript for iteration. */
    // "sourceRoot": "",                                 /* Specify the root path for debuggers to find the reference source code. */
    // "mapRoot": "",                                    /* Specify the location where debugger should locate map files instead of generated locations. */
    // "inlineSources": true,                            /* Include source code in the sourcemaps inside the emitted JavaScript. */
    // "emitBOM": true,                                  /* Emit a UTF-8 Byte Order Mark (BOM) in the beginning of output files. */
    // "newLine": "crlf",                                /* Set the newline character for emitting files. */
    // "stripInternal": true,                            /* Disable emitting declarations that have '@internal' in their JSDoc comments. */
    // "noEmitHelpers": true,                            /* Disable generating custom helper functions like '__extends' in compiled output. */
    // "noEmitOnError": true,                            /* Disable emitting files if any type checking errors are reported. */
    // "preserveConstEnums": true,                       /* Disable erasing 'const enum' declarations in generated code. */
    // "declarationDir": "./",                           /* Specify the output directory for generated declaration files. */
    // "preserveValueImports": true,                     /* Preserve unused imported values in the JavaScript output that would otherwise be removed. */


    /* Interop Constraints */
    // "isolatedModules": true,                          /* Ensure that each file can be safely transpiled without relying on other imports. */
    // "verbatimModuleSyntax": true,                     /* Do not transform or elide any imports or exports not marked as type-only, ensuring they are written in the output file's format based on the 'module' setting. */
    // "allowSyntheticDefaultImports": true,             /* Allow 'import x from y' when a module doesn't have a default export. */
    "esModuleInterop": true,                             /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */
    // "preserveSymlinks": true,                         /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */
    "forceConsistentCasingInFileNames": true,            /* Ensure that casing is correct in imports. */


    /* Type Checking */
    "strict": true,                                      /* Enable all strict type-checking options. */
    // "noImplicitAny": true,                            /* Enable error reporting for expressions and declarations with an implied 'any' type. */
     "strictNullChecks": false,                         /* When type checking, take into account 'null' and 'undefined'. */
    // "strictFunctionTypes": true,                      /* When assigning functions, check to ensure parameters and the return values are subtype-compatible. */
    // "strictBindCallApply": true,                      /* Check that the arguments for 'bind', 'call', and 'apply' methods match the original function. */
    // "strictPropertyInitialization": true,             /* Check for class properties that are declared but not set in the constructor. */
    // "noImplicitThis": true,                           /* Enable error reporting when 'this' is given the type 'any'. */
    // "useUnknownInCatchVariables": true,               /* Default catch clause variables as 'unknown' instead of 'any'. */
    // "alwaysStrict": true,                             /* Ensure 'use strict' is always emitted. */
    // "noUnusedLocals": true,                           /* Enable error reporting when local variables aren't read. */
    // "noUnusedParameters": true,                       /* Raise an error when a function parameter isn't read. */
    // "exactOptionalPropertyTypes": true,               /* Interpret optional property types as written, rather than adding 'undefined'. */
    // "noImplicitReturns": true,                        /* Enable error reporting for codepaths that do not explicitly return in a function. */
    // "noFallthroughCasesInSwitch": true,               /* Enable error reporting for fallthrough cases in switch statements. */
    // "noUncheckedIndexedAccess": true,                 /* Add 'undefined' to a type when accessed using an index. */
    // "noImplicitOverride": true,                       /* Ensure overriding members in derived classes are marked with an override modifier. */
    // "noPropertyAccessFromIndexSignature": true,       /* Enforces using indexed accessors for keys declared using an indexed type. */
    // "allowUnusedLabels": true,                        /* Disable error reporting for unused labels. */
    // "allowUnreachableCode": true,                     /* Disable error reporting for unreachable code. */


    /* Completeness */
    // "skipDefaultLibCheck": true,                      /* Skip type checking .d.ts files that are included with TypeScript. */
    "skipLibCheck": true                                 /* Skip type checking all .d.ts files. */
  }
}

运行结果