尘风
红尘往事,一切随风

<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
<script src="https://www.imooc.com/static/lib/jquery/1.9.1/jquery.js"></script>
</head>
<body>
 <form>
 <input class="h1">
  <select id="cs" >
       <option value="1">加法</option>
        <option value="2">减法</option>
        <option value="3">乘法</option>
        <option value="4">除法</option>
      </select>
 <input class="h2">
<input type="button" value="=" onclick="add2()" >
   <input class="h3" >
  </form>

  <script type="text/javascript">
  function add2(){
         var a=$(".h1").val();
         var b=$(".h2").val();
         var v=$("#cs").val();
        if(v=="1"){var sum = parseInt(a) + Number(b);
                   $(".h3").val(sum);
                  }
         if(v=="2"){var sum = parseInt(a) - Number(b);
                   $(".h3").val(sum);
                  }
         if(v=="3"){var sum = parseInt(a) * Number(b);
                   $(".h3").val(sum);
                  }
          if(v=="4"){var sum = parseInt(a) / Number(b);
                   $(".h3").val(sum);
                  }
    }
</script>
</body>
</html>

posted on 2020-09-07 23:54  一个行者  阅读(159)  评论(0编辑  收藏  举报