最終效果如下圖-2，有bug：就是整數后點擊%號結果正確，如果小數后面點擊%的話結果就錯誤！其他都正常，求指點：input的value是string類型的，在JS中改如何正確處理下圖-1中的if部分？？
圖-1
圖-2
HTML代碼如下
<body><div id="calculator"> <div class="LOGO"> <span class="name">簡單的計算器</span> <span class="verson">@walker</span> </div> <div id="shuRu"> <!--screen輸入欄--> <div class="screen"> <input type="text" id="screenName" name="screenName" class="screen"> </div> </div> <div id="keys"> <!-- j --> <!--第一排--> <input type="button" id="7" onclick="jsq(this.id)" value="7" class="buttons"> <input type="button" id="8" onclick="jsq(this.id)" value="8" class="buttons"> <input type="button" id="9" onclick="jsq(this.id)" value="9" class="buttons"> <input type="button" id="Back" onclick="tuiGe()" value="Back" class="buttons"> <input type="button" id="C" onclick="clearNum()" value="C" class="buttons" style="margin-right:0px"> <!--第二排--> <input type="button" id="4" onclick="jsq(this.id)" value="4" class="buttons"> <input type="button" id="5" onclick="jsq(this.id)" value="5" class="buttons"> <input type="button" id="6" onclick="jsq(this.id)" value="6" class="buttons"> <input type="button" id="*" onclick="jsq(this.id)" value="X" class="buttons"> <input type="button" id="/" onclick="jsq(this.id)" value="/" class="buttons" style="margin-right:0px"> <!--第三排--> <input type="button" id="1" onclick="jsq(this.id)" value="1" class="buttons"> <input type="button" id="2" onclick="jsq(this.id)" value="2" class="buttons"> <input type="button" id="3" onclick="jsq(this.id)" value="3" class="buttons"> <input type="button" id="+" onclick="jsq(this.id)" value="+" class="buttons"> <input type="button" id="-" onclick="jsq(this.id)" value="-" class="buttons" style="margin-right:0px"> <!--第四排--> <input type="button" id="0" onclick="jsq(this.id)" value="0" class="buttons"> <input type="button" id="00" onclick="jsq(this.id)" value="00" class="buttons"> <input type="button" id="." onclick="jsq(this.id)" value="." class="buttons"> <input type="button" id="%" onclick="jsq(this.id)" value="%" class="buttons"> <input type="button" id="eva" onclick="eva()" value="=" class="buttons" style="margin-right:0px"> </div> <div class="footer"> <span class="aside">歡迎使用JavaScript計算器</span> <span class="link"> <a href="#" title="聲明" target="_blank">反饋</a> </span> </div></div></body>
CSS代碼如下：
<style> /*Basic reset*/*{ margin:0; padding:0; box-sizing: border-box; font: 14px Arial,sans-serif;}html{ height:100%; background-color:lightslategrey;}#calculator{ margin: 15px auto; width:330px; height:400px; border: 1px solid lightgray; background-color:darkgrey; padding:15px;}/*LOGO*/.LOGO{ height:20px;}.LOGO .name{ float:left; line-height:30px;}.LOGO .verson{ float:right; line-height:30px;}/*screen*/#shuRu{ margin-top:15px;}.screen{ margin-top:5px; width:300px; height:40px; text-align: right; padding-right:10px; font-size:20px;}#keys{ border:1px solid lightgray; height:223px; margin-top:25px; padding:8px;}#keys .last{ margin-right:0px;}.footer{ margin-top:20px; height:20px;}.footer .link{ float:right;}#keys .buttons{ float:left; width: 42px; height: 36px; text-align:center; background-color:lightgray; margin: 0 17px 20px 0;} </style>javascript代碼如下：
<script> var num = 0; // 定義第一個輸入的數據 function jsq(num) { //獲取當前輸入 if(num=="%"){ document.getElementById('screenName').value=Math.round(document.getElementById('screenName').value)/100; }else{ document.getElementById('screenName').value += document.getElementById(num).value; } } function eva() { //計算輸入結果 document.getElementById("screenName").value = eval(document.getElementById("screenName").value); } function clearNum() { //清0 document.getElementById("screenName").value = null; document.getElementById("screenName").focus(); } function tuiGe() { //退格 var arr = document.getElementById("screenName"); arr.value = arr.value.substring(0, arr.value.length - 1); } </script> 以上這篇javascript實現簡單計算器效果【推薦】就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持武林網。
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