为啥按等号出不了结果

源自：6-11 编程练习

<!DOCTYPE html>

<html>

<head>

function count(){

//获取第一个输入框的值

var text1 = document.getElementById("txt1").value;

//获取第二个输入框的值

var text2 = document.getElementById("tet2").value;

//获取选择框的值

var sel = document.getElementById("select").value;

var result = ""

switch(sel){

case '+':

result = parseInt(text1) + parseInt(text2);

break;

case '-':

result = parseInt(text1) - parseInt(text2);

break;

case '*':

result = parseInt(text1) * parseInt(text2);

break;

default:

result = parseInt(text1) / parseInt(text2);

}

//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

document.getElementById("fruit").value = result;

}

</script>

</head>

<body>

</select>

</body>

</html>

提问者：weixin_慕婉清0268562 2020-06-11 15:06