如何解决JS表单计算器
我将这个简单的计算器作为我在 JS 中的第一个项目。我参加了一门课程，他们告诉我，程序员很“懒惰”，所以他们试图编写尽可能少的代码。我的问题来了。我认为我的计算器代码很长。我想知道，是否有任何方法可以用更少的代码完成这个。谢谢你的时间，祝你有美好的一天:)
function result() {
var amount = parseInt(document.getElementById("number").value);
var size = document.getElementById("velikost").value;
var color = document.getElementById("barva").value;
var price;
if(amount <= 19) {
if((size == 1) && (color == 1)) {
price = 2.5
}
else if ((size == 1) && (color == 2)) {
price = 3
}
else if ((size == 1) && (color == 3)) {
price = 9.9
}
else if ((size == 1) && (color == 4)) {
price = 10.9
}
else if ((size == 2) && (color == 1)) {
price = 3.9
}
else if ((size == 2) && (color == 2)) {
price = 4.5
}
else if ((size == 2) && (color == 3)) {
price = 28.9
}
else if ((size == 2) && (color == 4)) {
price = 29.9
} }
else if((amount > 19) &&(amount <= 49)) {
if((size == 1) && (color ==1)) {
price = 1.6
}
else if((size == 1) && (color ==2)) {
price = 2.2
}
else if((size == 1) && (color ==3)) {
price = 8.9
}
else if((size == 1) && (color ==4)) {
price = 9.9
}
else if((size == 2) && (color ==1)) {
price = 3.3
}
else if((size == 2) && (color ==2)) {
price = 4.1
}
else if((size == 2) && (color ==3)) {
price = 17.9
}
else if((size == 2) && (color ==4)) {
price = 19.9
}
}
else if((amount > 49) &&(amount <=99)){
if((size == 1) && (color ==1)) {
price = 1.4
}
if((size == 1) && (color ==2)) {
price = 2
}
if((size == 1) && (color ==3)) {
price = 6.9
}
if((size == 1) && (color ==4)) {
price = 8.9
}
if((size == 2) && (color ==1)) {
price = 3
}
if((size == 2) && (color ==2)) {
price = 3.8
}
if((size == 2) && (color ==3)) {
price = 12.9
}
if((size == 2) && (color ==4)) {
price = 15.9
}
}
else if ((amount > 99) && (amount <= 499)) {
if((size == 1) && (color ==1)) {
price = 1.2
}
if((size == 1) && (color ==2)) {
price = 1.8
}
if((size == 1) && (color ==3)) {
price = 4.9
}
if((size == 1) && (color ==4)) {
price = 6.9
}
if((size == 2) && (color ==1)) {
price = 2.6
}
if((size == 2) && (color ==2)) {
price = 3.4
}
if((size == 2) && (color ==3)) {
price = 9.9
}
if((size == 2) && (color ==4)) {
price = 12.9
}
}
else if ((amount > 499) && (amount <= 999)) {
if((size == 1) && (color ==1)) {
price = 1.1
}
if((size == 1) && (color ==2)) {
price = 1.6
}
if((size == 1) && (color ==3)) {
price = 3.9
}
if((size == 1) && (color ==4)) {
price = 4.9
}
if((size == 2) && (color ==1)) {
price = 2.4
}
if((size == 2) && (color ==2)) {
price = 3.2
}
if((size == 2) && (color ==3)) {
price = 6.9
}
if((size == 2) && (color ==4)) {
price = 7.9
}
}
else if ((amount > 999)) {
if((size == 1) && (color ==1)) {
price = 1
}
if((size == 1) && (color ==2)) {
price = 1.5
}
if((size == 1) && (color ==3)) {
price = 2.9
}
if((size == 1) && (color ==4)) {
price = 3.9
}
if((size == 2) && (color ==1)) {
price = 2.2
}
if((size == 2) && (color ==2)) {
price = 2.9
}
if((size == 2) && (color ==3)) {
price = 4.9
}
if((size == 2) && (color ==4)) {
price = 5.9
}
}
document.getElementById("vysledek").innerHTML=amount * price;
}
解决方法
你可以创建一个这样的对象。 小例子只是为了展示用例：
const amountLt19 = {
size: {
1: {
color: {
1: 2.5,2: 3,3: 9.9
}
}
}
}
const objSize = amountLt19[size];
const price = objSize && objSize[color]
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