日期:2014-05-16  浏览次数:20467 次

用JavaScript写一个简单的计算器
<html>
    <head>
       <title>简单计算器</title>
       <script>
          function doCal(){
              var value1=parseInt(document.getElementById("value1").value);
              var flag=document.getElementById("value1").value
              var value1=parseInt(document.getElementById("value1").value);
              eval("var s="+value1+flag+value2);
              document.getElementById("result").innerHTML="<font color='red'>"+s+"</font>";
          }
       </script>
    </head>
    <body>
       <h1>简单计算器<h1>
       <hr>
       <input type="text" name="value1" id="value1">
       <select name="flag">
           <option value="+">+</option>
           <option value="-">-</option>
           <option value="*">*</option>
           <option value="/">/</option>
        </select>
        <input type="text" name="value2" id="value2">
        <input type="button" value"=" onclick="doCal();">
        <span id="result"></span>
     </body>
</html>