ES6模块化开发计算器小案例续

爱学习的前端歌谣

发布于 2023-11-16 13:32:56

1210

发布于 2023-11-16 13:32:56

文章被收录于专栏：前端小歌谣前端小歌谣

前言

大家好我是歌谣接着上节webpack进行数据得一个说明

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>计算小案例</title>
    </head>
    <body>
        <div class="calculator J_calculater">
            <p>结果:<span class="result">0</span></p>
            <div class="input_wrap">
                <input type="text" value="0" class="num-input" placeholder="第一个数字"/>
                <input type="text" value="0" class="num-input" placeholder="第二个数字"/>
            </div>
            <div class="btn-group">
                <button data-method="plus">+</button>
                <button data-method="minus">-</button>
                <button data-method="mul">*</button>
                <button data-method="div">/</button>
            </div>
        </div>
    </body>
    <script type="module" src="./index.js"></script>
    </html>
</body>
</html>

index.js

import Calculator from "./Calculator";
;((doc)=>{
    var oCalculator = document.getElementsByClassName("J_calculater")[0]
    const init=()=>{
        new Calculator(oCalculator).init()
    }
    init()
})(document)

calculator.js

export default class Calculator {
    constructor(el) {
        this.name = "Calculator"
        this.oResult = el.getElementsByClassName("result")[0]
        this.oBtnGroup = el.getElementsByClassName("btn-group")[0]
        this.oInputs = el.getElementsByClassName("num-input")
    }
    init() {
        this.bindEvent()
    }
    bindEvent() {
        this.oBtnGroup.addEventListener("click", this.onBtnClick.bind(this), false)
    }
    onBtnClick(ev) {
        const e = ev || window.event,
            tar = e.target || e.srcElement,
            tagName = tar.tagName.toLowerCase();
        console.log(tagName)
        if (tagName === 'button') {
            const method = tar.getAttribute("data-method");
               var fval = Number(this.oInputs[0].value.replace(/\s+/g, ''))||0;
               var sval = Number(this.oInputs[1].value.replace(/\s+/g, ''))||0;
                switch (method) {
                    case 'plus':
                       this.oResult.innerText=fval+sval
                        break;
                    case 'minus':
                        this.oResult.innerText=fval-sval
                        break;
                    case 'mul':
                        this.oResult.innerText=fval*sval
                        break;
                    case 'div':
                        this.oResult.innerText=fval/sval
                        break;
                    default:
                        break
                }
        }
    }
}

运行结果

变化1

caculater.js

import Compute from "./Compute"
export default class Calculator extends Compute {
    constructor(el) {
        super()
        this.name = "Calculator"
        this.oResult = el.getElementsByClassName("result")[0]
        this.oBtnGroup = el.getElementsByClassName("btn-group")[0]
        this.oInputs = el.getElementsByClassName("num-input")
    }
    init() {
        this.bindEvent()
    }
    bindEvent() {
        this.oBtnGroup.addEventListener("click", this.onBtnClick.bind(this), false)
    }
    onBtnClick(ev) {
        const e = ev || window.event,
            tar = e.target || e.srcElement,
            tagName = tar.tagName.toLowerCase();
        console.log(tagName)
        if (tagName === 'button') {
            const method = tar.getAttribute("data-method");
            console.log(method, "method is")
            var fval = Number(this.oInputs[0].value.replace(/\s+/g, '')) || 0;
            var sval = Number(this.oInputs[1].value.replace(/\s+/g, '')) || 0;
            this.setResult(method, fval, sval)
        }
    }
    setResult(method, fval, sval) {
        console.log(method, fval, sval)
        this.oResult.innerText = this[method](fval, sval)
    }
}

computed.js

export default class Compute{
    plus(a,b){
        return a+b;
    }
    minus(a,b){
        return a-b
    }
    mul(a,b){
        return a*b
    }
    div(a,b){
        return a/b
    }
}

运行结果

变化二装饰器模式

配置

{
    "presets": ["env"],
    "plugins": ["babel-plugin-transform-runtime","transform-decorators-legacy"]
}

Caculator.js

import Compute from "./Compute"
@Compute
export default class Calculator {
    constructor(el) {
        this.name = "Calculator";
        this.oResult = el.getElementsByClassName("result")[0];
        this.oBtnGroup = el.getElementsByClassName("btn-group")[0];
        this.oInputs = el.getElementsByClassName("num-input");
    }
    init() {
        this.bindEvent()
    }
    bindEvent() {
        this.oBtnGroup.addEventListener("click", this.onBtnClick.bind(this), false)
    }
    onBtnClick(ev) {
        const e = ev || window.event,
            tar = e.target || e.srcElement,
            tagName = tar.tagName.toLowerCase();
        console.log(tagName)
        if (tagName === 'button') {
            const method = tar.getAttribute("data-method");
            console.log(method, "method is")
            var fval = Number(this.oInputs[0].value.replace(/\s+/g, '')) || 0;
            var sval = Number(this.oInputs[1].value.replace(/\s+/g, '')) || 0;
            this.setResult(method, fval, sval)
        }
    }
    setResult(method, fval, sval) {
        console.log(method, fval, sval)
        this.oResult.innerText = this[method](fval, sval)
    }
}

Computed.js

export default (target) => {
    target.prototype.plus=function(a, b){
        return a + b;
    }
    target.prototype.minus=function(a, b){
        return a - b
    }
    target.prototype.mul=function(a, b){
        return a * b
    }
    target.prototype.div=function(a, b){
        return a / b
    }
}

index.js

import Calculator from "./Calculator";
;((doc)=>{
    var oCalculator = document.getElementsByClassName("J_calculater")[0]
    const init=()=>{
        new Calculator(oCalculator).init()
    }
    init()
})(document)

运行结果

最终结构目录

tool.js

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>计算小案例</title>
    </head>
    <body>
        <div class="calculator J_calculater">
            <p>结果:<span class="result">0</span></p>
            <div class="input_wrap">
                <input type="text" value="0" class="num-input" placeholder="第一个数字"/>
                <input type="text" value="0" class="num-input" placeholder="第二个数字"/>
            </div>
            <div class="btn-group">
                <button data-method="plus">+</button>
                <button data-method="minus">-</button>
                <button data-method="mul">*</button>
                <button data-method="div">/</button>
            </div>
        </div>
    </body>
    
    </html>
</body>
</html>

index.js

import Calculator from "./Calculator";
;((doc)=>{
    var oCalculator = document.getElementsByClassName("J_calculater")[0]
    const init=()=>{
        new Calculator(oCalculator).init()
    }
    init()
})(document)

computed.js

// export default class Compute{
//     plus(a,b){
//         return a+b;
//     }
//     minus(a,b){
//         return a-b
//     }
//     mul(a,b){
//         return a*b
//     }
//     div(a,b){
//         return a/b
//     }
// }


export default (target) => {
    target.prototype.plus=function(a, b){
        return a + b;
    }
    target.prototype.minus=function(a, b){
        return a - b
    }
    target.prototype.mul=function(a, b){
        return a * b
    }
    target.prototype.div=function(a, b){
        return a / b
    }
}

caculator.js

import Compute from "./Compute"
import {
    trimSpace,
    digitalize
} from "./tools"
@Compute
export default class Calculator {
    constructor(el) {
        this.name = "Calculator";
        this.oResult = el.getElementsByClassName("result")[0];
        this.oBtnGroup = el.getElementsByClassName("btn-group")[0];
        this.oInputs = el.getElementsByClassName("num-input");
    }
    init() {
        this.bindEvent()
    }
    bindEvent() {
        this.oBtnGroup.addEventListener("click", this.onBtnClick.bind(this), false)
    }
    onBtnClick(ev) {
        const e = ev || window.event,
            tar = e.target || e.srcElement,
            tagName = tar.tagName.toLowerCase();
        console.log(tagName)
        if (tagName === 'button') {
            const method = tar.getAttribute("data-method");
            console.log(method, "method is")
            var fval = digitalize(trimSpace(this.oInputs[0].value));
            var sval = digitalize(trimSpace(this.oInputs[1].value));
            this.setResult(method, fval, sval)
        }
    }
    setResult(method, fval, sval) {
        console.log(method, fval, sval)
        this.oResult.innerText = this[method](fval, sval)
    }
}

装饰器配置.babelrc

{
    "presets": ["env"],
    "plugins": ["babel-plugin-transform-runtime","transform-decorators-legacy"]
}

依赖

{
  "name": "demo",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "dev":"webpack-dev-server --config webpack.config.js",
    "webpack":"webpack --config webpack.config.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "babel-core": "^6.26.3",
    "babel-loader": "7",
    "babel-plugin-transform-decorators": "^6.24.1",
    "babel-plugin-transform-decorators-legacy": "^1.3.5",
    "babel-plugin-transform-runtime": "^6.23.0",
    "babel-preset-env": "^1.7.0",
    "css-loader": "^6.8.1",
    "ejs-loader": "^0.5.0",
    "html-webpack-plugin": "^5.5.3",
    "node-sass": "^9.0.0",
    "sass-loader": "^13.3.2",
    "style-loader": "^3.3.3",
    "webpack": "^5.89.0",
    "webpack-cli": "^5.1.4",
    "webpack-dev-server": "^4.15.1"
  }
}

运行结果