戳等号没反应

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 num1 = parseInt(document.getElementById("txt1").value);

//获取第二个输入框的值

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

//获取选择框的值

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

//获取通过下拉框来选择的值来改变加减乘除的运算法则

var result = 0;

//设置结果输入框的值

switch(option){

case "+":

result = num1+num2;

break;

case "-":

result = num1-num2;

break;

case "*":

result = num1*num2;

break;

default "/":

result = num1/num2;

}

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

}

</script>

</head>

<body>

</select>

</body>

</html>

提问者：weixin_慕UI0052680 2022-02-07 23:57