找不到哪里错了，点击“=”按钮后，框里就出现这个“[object HTMLInputElement][object HTMLInputElement]”

<!DOCTYPE html>
<html>
<head>
<title> 事件</title>
<script type="text/javascript">
   function count(){
     var num1=parseInt(document.getElementById("txt1").value);



     var num2=parseInt(document.getElementById("txt2").value);

     var select1=document.getElementById("select").value;
     var num="";
     switch(select1){
         case "+":
             num=txt1+txt2;
             break;
        case "-":
            num=txt1-txt2;
            break;
        case "*":
            num=txt1*txt2;
            break;
        case "/":
            num=txt1/txt2;
            break;
     }
     document.getElementById('fruit').value=num;


</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>

慕盖茨0216957

浏览 2483回答 3

找不到哪里错了，点击“=”按钮后 ，框里就出现这个“[object HTMLInputElement][object HTMLInputElement]”

3回答

找不到哪里错了，点击“=”按钮后，框里就出现这个“[object HTMLInputElement][object HTMLInputElement]”