跪求，哪儿错啦，咋运行不出来啊

<!DOCTYPE html>
<html>
<head>
<title> 事件</title>
<script type="text/javascript">
   function count(){
    var abb1=document.getElementById("txt1").value;
   var abb2=document.getElementById("txt2").value;
    var abb3=document.getElementById("select").value;
   swith(abb3)
    {
        case "+":var num3 = parseInt(abb1) + parseInt(abb2);break;
        case "-":var num3 = parseInt(abb1) + parseInt(abb2);break;
        case "*":var num3 = parseInt(abb1) + parseInt(abb2);break;
        case "/":var num3 = parseInt(abb1) + parseInt(abb2);break;
    }//获取通过下拉框来选择的值来改变加减乘除的运算法则
      document.getElementById("fruit").value = num3;
    //设置结果输入框的值
   }
</script>
</head>
<body>
   <input type='text' id='txt1' />
   <select id='select'>
       <option value='+'>+</option>
       <option value="-">-</option>
       <option value="*">*</option>
       <option value="/">/</option>
   </select>
   <input type='text' id='txt2' />
   <input type='button' value=' = ' onclick=count()/> 
   <input type='text' id='fruit' />
</body>
</html>

宿宿公主

浏览 1514回答 3

3回答

晴天不出门

小错误----onclick="count()"

guozhchun

<input type='button' value=' = ' onclick=count()/> swith(abb3) // switch 单词写错 { case "+":var num3 = parseInt(abb1) + parseInt(abb2);break; case "-":var num3 = parseInt(abb1) + parseInt(abb2);break; // 表达式中运算符写错 case "*":var num3 = parseInt(abb1) + parseInt(abb2);break; // 表达式中运算符写错 case "/":var num3 = parseInt(abb1) + parseInt(abb2);break; // 表达式中运算符写错，PS：考虑一下除0情况 }

碎碎的时光

三个小错误

随时随地看视频慕课网APP