完美实现完美实现

源自：6-11 编程练习

<!DOCTYPE html>

<html>

<head>

function count(){

var firstValue=parseInt(document.getElementById("txt1").value);

var seconedValue=parseInt(document.getElementById("txt2").value);//获取第二个输入框的值

var myoption=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

switch (myoption) {

case "+":

var lastValue=firstValue+seconedValue;

break;

case "-":

var lastValue=firstValue-seconedValue;

break;

case "*":

var lastValue=firstValue*seconedValue;

break;

default:

var lastValue=firstValue/seconedValue;

}

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

}

</script>

</head>

<body>

</select>

</body>

</html>

提问者：LouisDuan 2019-03-15 21:19