                        课程
                    
                        /前端开发
                        
                            /JavaScript
                        
                        /JavaScript进阶篇

为何会没反应

这是本地调试返回的 SyntaxError: expected expression, got end of script

代码

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> 事件</title>
<script type="text/javascript">
   function count(){
    //获取第一个输入框的值
   //获取第二个输入框的值
   //获取选择框的值
   //获取通过下拉框来选择的值来改变加减乘除的运算法则
    //设置结果输入框的值

    var a = document.getElementById('txt1').value;
    var b = document.getElementById('txt2').value;
    var sElect = document.getElementById('select').value;
    var rEsult;
    switch(sElect){
       case "+":
       rEsult = parseFloat(a) + parseFloat(b);
       case "-":
       rEsult = parseFloat(a) - parseFloat(b);
       case "*":
       rEsult = parseFloat(a) * parseFloat(b);
       default :
       rEsult = parseFloat(a) / parseFloat(b);
    }
        document.getElementById('fruit').value = rEsult;
   }

</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>