• 简易计算器的实现


    <!doctype html>
    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>简单的计算器</title>
    <style>
    body{
    margin: 0;
    }
    .tab{
    border: 3px solid black ;
    border-radius: 2px;
    border-collapse:collapse;
    268px;
    height: 402px;
    margin: 100px auto;
    }

    .tr{
    height: 67px;
    268px;
    border: 3px solid black ;
    text-align: right;
    }
    .tr1{
    268px;
    height: 67px;
    border: 3px solid black ;
    text-align: center;
    }
    .tr2{
    67px;
    height: 67px;
    border: 3px solid black ;
    text-align: center;
    }


    </style>
    <script>

    var s1 = "";
    var s2 = "";
    var s3 = "";
    var s4 = "";
    var s5 = "";
    function view(val){
    var a = document.getElementById(val);
    s1 = a.innerHTML;
    if(s1=="+" || s1=="-" || s1=="*" || s1=="/"){
    s3 = s1;
    s1 = "";
    }

    if(s3=="+" || s3=="-" || s3=="*" || s3=="/"){
    add2(s1);

    }

    if(s3==""){
    add1(s1);

    }




    }
    function add1(s1){
    s2 = s2 + s1;
    show();
    }
    function add2(s1){
    s4 = s4 + s1;
    show();
    }

    function cal(){
    switch(s3){
    case "+":{
    s5 = (String)((parseFloat(s2)+parseFloat(s4)).toFixed(2));
    result.innerHTML = s5;
    break;
    }
    case "-":{
    s5 = (String)((parseFloat(s2)-parseFloat(s4)).toFixed(2));
    result.innerHTML = s5;
    break;
    }
    case "*":{
    s5 = (String)((parseFloat(s2)*parseFloat(s4)).toFixed(2));
    result.innerHTML = s5;
    break;
    }
    case "/":{
    s5 = (String)((parseFloat(s2)/parseFloat(s4)).toFixed(2));
    result.innerHTML = s5;
    break;
    }
    }

    }

    function show(){
    var result = document.getElementById("result");

    result.innerHTML = s2+s3+s4;

    }



    </script>
    </head>
    <body>
    <table class="tab">
    <tr class = "tr2">
    <td colspan="4">简易计算器</td>
    </tr>
    <tr class="tr">
    <td id="result" colspan="4" >

    </td>
    </tr>
    <tr >
    <td id="+" class="tr1" onclick="view('+')">+</td>
    <td id="-" class="tr1" onclick="view('-')">-</td>
    <td id="*" class="tr1" onclick="view('*')">*</td>
    <td id="/" class="tr1" onclick="view('/')">/</td>
    </tr>
    <tr >
    <td id="7" class="tr1" onclick="view('7')">7</td>
    <td id="8" class="tr1" onclick="view('8')">8</td>
    <td id="9" class="tr1" onclick="view('9')">9</td>
    <td id="0" class="tr1" onclick="view('0')">0</td>
    </tr>
    <tr>
    <td id="4" class="tr1" onclick="view('4')">4</td>
    <td id="5" class="tr1" onclick="view('5')">5</td>
    <td id="6" class="tr1" onclick="view('6')">6</td>
    <td id="." class="tr1" onclick="view('.')">.</td>
    </tr>
    <tr>
    <td id="1" class="tr1" onclick="view('1')">1</td>
    <td id="2" class="tr1" onclick="view('2')">2</td>
    <td id="3" class="tr1" onclick="view('3')">3</td>
    <td id="=" class="tr1" onclick="cal()" >=</td>
    </tr>
    </table>
    </body>
    </html

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  • 原文地址:https://www.cnblogs.com/willamq/p/7301478.html
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