使用 vue 创建一个多功能计算器
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先来一张效果图
代码
html
<div id="app"> <div class="calculator"> <button @click="changeModeEvent" class="toggle-button"> <p v-if="changeMode">切换高级模式 ⚈</p> <p v-else>切换简单模式 ⚆</p> </button> <div class="results"> <input class="input" v-model="current" /> </div> <div class="mode" v-if="changeMode"> <button class="button" @click="press">7</button> <button class="button" @click="press">8</button> <button class="button" @click="press">9</button> <button class="button" @click="press">*</button> <button class="button" @click="press"><=</button> <button class="button" @click="press">C</button> <button class="button" @click="press">4</button> <button class="button" @click="press($event)">5</button> <button class="button" @click="press">6</button> <button class="button" @click="press">/</button> <button class="button" @click="press">(</button> <button class="button" @click="press">)</button> <button class="button" @click="press">1</button> <button class="button" @click="press">2</button> <button class="button" @click="press">3</button> <button class="button" @click="press">-</button> <button class="button" @click="press">x ²</button> <button class="button" @click="press">±</button> <button class="button" @click="press">0</button> <button class="button" @click="press">.</button> <button class="button" @click="press">%</button> <button class="button" @click="press">+</button> <button class="button equal-sign" @click="press">=</button> </div> <div class="mode" v-else> <button class="button" @click="press">sin</button> <button class="button" @click="press">cos</button> <button class="button" @click="press">tan</button> <button class="button" @click="press">x^</button> <button class="button" @click="press"><=</button> <button class="button" @click="press">C</button> <button class="button" @click="press">log</button> <button class="button" @click="press">ln</button> <button class="button" @click="press">e</button> <button class="button" @click="press">∘</button> <button class="button" @click="press">rad</button> <button class="button" @click="press">√</button> <button class="button" @click="press">7</button> <button class="button" @click="press">8 </button> <button class="button" @click="press">9</button> <button class="button" @click="press">/</button> <button class="button" @click="press">x ²</button> <button class="button" @click="press">x !</button> <button class="button" @click="press">4</button> <button class="button" @click="press">5</button> <button class="button" @click="press">6</button> <button class="button" @click="press">*</button> <button class="button" @click="press">(</button> <button class="button" @click="press">)</button> <button class="button" @click="press">1</button> <button class="button" @click="press">2</button> <button class="button" @click="press">3</button> <button class="button" @click="press">-</button> <button class="button" @click="press">%</button> <button class="button" @click="press">±</button> <button class="button" @click="press">0</button> <button class="button" @click="press">.</button> <button class="button" @click="press">π</button> <button class="button" @click="press">+</button> <button class="button equal-sign" @click="press">=</button> </div> </div> </div> <script src='js/vue.min.js'></script> <script src="js/index.js"></script>css
@import "https://cdn.bootcdn.net/ajax/libs/normalize/8.0.1/normalize.min.css"; body { background: linear-gradient(to right, #85D8CE, #085078); } #app { font-family: 'Microsoft Yahei', Helvetica, Arial, sans-serif; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; text-align: center; color: #2c3e50; display: flex; flex-wrap: wrap; justify-content: center; align-item: center; margin-top: 80px; } .calculator { width: 440px; padding: 20px; border-radius: 5px; margin: 20px auto; font-size: 16px; background-color: #333333; } .input { width: 420px; height: 50px; border-radius: 0px; border: 1px solid black; background-color: #333333; color: #d9d9d9; padding: 0 5px 0 5px; margin: 0 0px 10px 0px; font-size: 30px; } .input:focus, .input:active { border-color: #03a9f4; box-shadow: 0 0 4px #03A9F4; outline: none 0; } .button { margin: 3px; width: 63px; border: 1px solid #0d0d0d; height: 30px; border-radius: 4px; color: #d9d9d9; background-color: #1a1a1a; cursor: pointer; outline: none; } .mode { display: flex; flex-wrap: wrap; justify-content: space-evenly; } .equal-sign { background-color: green; width: 133px; } .toggle-button { border: none; background-color: #333333; cursor: pointer; outline: none; font-size: 1rem; color: #fff; text-shadow: -1px -1px 0 rgba(0, 0, 0, 0.35); } p { margin-top: 0; } button::-moz-focus-inner { border-color: transparent; }js
'use strict'; var app = new Vue({ el: '#app', data: function data() { return { current: '', changeMode: true }; }, methods: { press: function press(event) { var me = this; var key = event.target.textContent; if (key != '=' && key != 'C' && key != '*' && key != '/' && key != '√' && key != "x ²" && key != "%" && key != "<=" && key != "±" && key != "sin" && key != "cos" && key != "tan" && key != "log" && key != "ln" && key != "x^" && key != "x !" && key != "Ï€" && key != "e" && key != "rad" && key != "∘") { me.current += key; } else if (key === '=') { if (me.current.indexOf('^') > -1) { var base = me.current.slice(0, me.current.indexOf('^')); var exponent = me.current.slice(me.current.indexOf('^') + 1); me.current = eval('Math.pow(' + base + ',' + exponent + ')'); } else { me.current = eval(me.current); } } else if (key === 'C') { me.current = ''; } else if (key === '*') { me.current += '*'; } else if (key === '/') { me.current += '/'; } else if (key === '+') { me.current += '+'; } else if (key === '-') { me.current += '-'; } else if (key === '±') { if (me.current.charAt(0) === '-') { me.current = me.current.slice(1); } else { me.current = '-' + me.current; } } else if (key === '<=') { me.current = me.current.substring(0, me.current.length - 1); } else if (key === '%') { me.current = me.current / 100; } else if (key === 'Ï€') { me.current = me.current * Math.PI; } else if (key === 'x ²') { me.current = eval(me.current * me.current); } else if (key === '√') { me.current = Math.sqrt(me.current); } else if (key === 'sin') { me.current = Math.sin(me.current); } else if (key === 'cos') { me.current = Math.cos(me.current); } else if (key === 'tan') { me.current = Math.tan(me.current); } else if (key === 'log') { me.current = Math.log10(me.current); } else if (key === 'ln') { me.current = Math.log(me.current); } else if (key === 'x^') { me.current += '^'; } else if (key === 'x !') { var number = 1; if (me.current === 0) { me.current = '1'; } else if (me.current < 0) { me.current = NaN; } else { var _number = 1; for (var i = me.current; i > 0; i--) { _number *= i; } me.current = _number; } } else if (key === 'e') { me.current = Math.exp(me.current); } else if (key === 'rad') { me.current = me.current * (Math.PI / 180); } else if (key === '∘') { me.current = me.current * (180 / Math.PI); } }, changeModeEvent: function changeModeEvent() { var me = this; me.changeMode = !me.changeMode; } } });参考来源：
https://www.jsdaima.com/Uploads/js/201803/1520473098/index.html
