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本文实例为大家分享了javascript实现计算器功能的具体代码,供大家参考,具体内容如下
问题描述:
1、除法操作时,如果被除数为0,则结果为0
2、结果如果为小数,最多保留小数点后两位,如2 / 3 =0.67(显示0.67),1 / 2 = 0.5(显示0.5)
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>百度笔试0329</title> <style type="text/css"> body, ul, li,select { margin: 0; padding: 0; box-sizing: border-box; } ul,li {list-style: none;} .calculator { max-width: 300px; margin: 20px auto; border: 1px solid #eee; border-radius: 3px; } .cal-header { font-size: 16px; color: #333; font-weight: bold; height: 48px; line-height: 48px; border-bottom: 1px solid #eee; text-align: center; } .cal-main { font-size: 14px; } .cal-main .origin-value { padding: 15px; height: 40px; line-height: 40px; font-size: 20px; text-align: right; overflow: hidden; text-overflow:ellipsis; white-space: nowrap; } .cal-main .origin-type, .cal-main .target-type { padding-left: 5px; width: 70px; font-size: 14px; height: 30px; border: 1px solid #eee; background-color: #fff; vertical-align: middle; margin-right: 10px; border-radius: 3px; } .cal-keyboard { overflow: hidden; } .cal-items { overflow: hidden; } .cal-items li { user-select: none; float: left; display: inline-block; width: 75px; height: 75px; text-align: center; line-height: 75px; border-top: 1px solid #eee; border-left: 1px solid #eee; box-sizing: border-box; } li:nth-of-type(4n+1) { border-left: none; } li[data-action=operator] { background: #f5923e; color: #fff; } .buttons { float: left; width: 75px; } .buttons .btn { width: 75px; background-color: #fff; border-top: 1px solid #eee; border-left: 1px solid #eee; height: 150px; line-height: 150px; text-align: center; } .btn-esc { color: #ff5a34; } .btn-backspace { position: relative; } </style> </head> <body> <div class="calculator"> <header class="cal-header">简易计算器</header> <main class="cal-main"> <div class="origin-value">0</div> <div class="cal-keyboard"> <ul class="cal-items"> <li data-action="num">7</li> <li data-action="num">8</li> <li data-action="num">9</li> <li data-action="operator">÷</li> <li data-action="num">4</li> <li data-action="num">5</li> <li data-action="num">6</li> <li data-action="operator">x</li> <li data-action="num">1</li> <li data-action="num">2</li> <li data-action="num">3</li> <li data-action="operator">-</li> <li data-action="num">0</li> <li data-action="operator">清空</li> <li data-action="operator">=</li> <li data-action="operator">+</li> </ul> </div> </main> </div> <script type="text/javascript"> var Calculator = { init: function () { var that = this; if (!that.isInited) { that.isInited = true; // 保存操作信息 // total: Number, 总的结果 // next: String, 下一个和 total 进行运算的数据 // action: String, 操作符号 that.data = {total: 0, next: '', action: ''}; that.bindEvent(); } }, bindEvent: function () { var that = this; // 请补充代码:获取 .cal-keyboard 元素 var keyboardEl = document.getElementsByClassName('cal-keyboard')[0] keyboardEl && keyboardEl.addEventListener('click', function (event) { // 请补充代码:获取当前点击的dom元素 var target = event.target; // 请补充代码:获取target的 data-action 值 var action = target.getAttribute('data-action'); // 请补充代码:获取target的内容 var value = target.innerHTML; if (action === 'num' || action === 'operator') { that.result(value, action === 'num'); } }); }, result: function (action, isNum) { var that = this; var data = that.data; if (isNum) { data.next = data.next === '0' "_blank" href="https://www.jb51.net/Special/162.htm">计算器功能汇总 进行学习以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。
标签:
js,计算器
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