前言：由于数学比较烂，只懂导数与微分，也正在研究半球几何，对于涉及到RMB的计算总怕算错几个小数点，于是使用简易的js开发计算器，这里并没有高精度的计算，还需优化。也没有运用到高大上的jquery。。。

<h1>js实现简单计算器</h1>

        <div id="calculator" class="calculator">

          <button id="clear" class="clear" onclick="cleart('g')">C</button>

          <div id="viewer" class="viewer">0</div>

          <button class="num" data-num="7" onclick="command(7)">7</button>
          <button class="num" data-num="8" onclick="command(8)">8</button>
          <button class="num" data-num="9" onclick="command(9)">9</button>
          <button data-ops="加上" class="ops" onclick="tools('+','g')">+</button>

          <button class="num" data-num="4" onclick="command(4)">4</button>
          <button class="num" data-num="5" onclick="command(5)">5</button>
          <button class="num" data-num="6" onclick="command(6)">6</button>
          <button data-ops="减去" class="ops" onclick="tools('-','g')">-</button>

          <button class="num" data-num="1" onclick="command(1)">1</button>
          <button class="num" data-num="2" onclick="command(2)">2</button>
          <button class="num" data-num="3" onclick="command(3)">3</button>
          <button data-ops="乘以" class="ops" onclick="tools('*','g')">*</button>

          <button class="num" data-num="0" onclick="command(0)">0</button>
          <button class="num" data-num="." onclick="command('.')">.</button>
          <button id="equals" class="equals" data-result="" onclick="equal('g')">=</button>
          <button data-ops="除以" class="ops" onclick="tools('/','g')">/</button>
        </div>

        <!-- <button id="reset" class="reset">Reset Universe?</button> -->

    <!-- <script src="js/calculator.js" type="text/javascript"></script> -->

    <div id="audioBox"></div>
        <script>javascript">
            var resultDom = document.getElementById("viewer");

            var operate = true;
            var xop = true;
            //点击计算机键盘
            function command(num){
                var str = resultDom.innerHTML;
                str = (str=="0"?"":str);
                str+=num;
                //resultDom.value = str;
                resultDom.innerHTML = str;
                play(num);
            }

            //计算
            function equal(m){
                play(m);
                var result = resultDom.innerHTML;
                var r = eval(result);
                resultDom.innerHTML = r;
                operate = true;
                //var r = 
            }

            //播放键盘声音
            function play(num){
                var boxDom = document.getElementById("audioBox");
                boxDom.innerHTML = "<embed src='${basePath}/resource/plugins/calculator/wav/m"+num+".wav' width='0' height='0'></embed>"
            }

            //运算符
            function tools(op,m){
                if(operate){
                    var num = resultDom.innerHTML;
                    num = (num=="0"?"":num);
                    resultDom.innerHTML = num + op;
                    operate = false;
                    xop = true;
                }
                play(m);
            }

            //清空
            function cleart(m){
                resultDom.innerHTML = "";
                operate = true;
                play(m);
            }
        </script>

源码下载：链接：http://pan.baidu.com/s/1miII8ek 密码：v1jh