如标题所述，我无法为产品分配折扣。当我加载页面时，它说nan和undefined。任何帮助表示赞赏。谢谢！
这是我的JavaScript代码：
var ProductType;
var ProductQty;
var ProductPrice;
var DiscountPercent;
var TotalAmount;
function calculate() {
ProductType = prompt("Please enter the type of product you require!").toUpperCase();
document.write("<br>");
ProductQty = prompt("Please enter the number of products you require!");
elsestatement();
ProductQty = parseInt(ProductQty);
document.write("Type of Products:" + ProductType);
document.write("<br>");
document.write("Number of Products:" + ProductQty);
document.write("<br>");
var GrossAmount =(ProductPrice) * (ProductQty);
document.write("Gross Amount is:" + GrossAmount);
GrossAmount = parseInt(GrossAmount);
discountAmt();
var DiscountAmount = (GrossAmount) - (GrossAmount) * (DiscountPercent)
var TotalAmount = (GrossAmount) * (DiscountPercent)
document.write("<br>");
document.write("Discount Amount:" + DiscountAmount)
document.write("<br>");
document.write("Discount Percent:" + DiscountPercent)
document.write("<br>");
document.write("Total Amount:" + TotalAmount)
}
function elsestatement(){
if (ProductType == 'A') {
ProductPrice = 100;
} else if (ProductType == 'B') {
ProductPrice = 75;
} else if (ProductType == 'C'){
ProductPrice = 50;
}
else {
document.write("<br>");
document.write("Invalid Product Type");
document.write("<br>");
}
if (ProductQty <1|| ProductQty >100) {
document.write("Invalid Quantity")
}
}
function discountAmt() {
if (GrossAmount <200) {
DiscountPercent = '0';
} else if (GrossAmount >= 200 && GrossAmount<=399.99) {
DiscountPercent = '.05';
} else if (GrossAmount>=400 && GrossAmount<=599.99 ) {
DiscountPercent = '.075';
} else if (GrossAmount >=600)
DiscountPercent = '.1';
}
这是我的HTML代码：
<!DOCTYPE html>
<html>
<title>Product</title>
<body>
<h1>Product Calc</h1>
<script src="Product.js"> </script>
<script>calculate()</script>
<script>elsestatement()</script>
<script>discountAmt()</script>
</body>
最佳答案
对困惑感到抱歉。我被误认为是未封闭的功能。相反，问题在于GrossAmount是在calculate函数而不是外部范围中定义的。因此，在discountAmt函数中无法达到。
这是您的固定代码，除了删除了document.write以便可以在沙箱中运行：
var ProductType;
var ProductQty;
var ProductPrice;
var DiscountPercent;
var TotalAmount;
var GrossAmount;
function calculate() {
ProductType = prompt("Please enter the type of product you require!").toUpperCase();
ProductQty = prompt("Please enter the number of products you require!");
elsestatement();
ProductQty = parseInt(ProductQty);
GrossAmount = ProductPrice * ProductQty;
GrossAmount = parseInt(GrossAmount);
discountAmt();
var DiscountAmount = GrossAmount - GrossAmount * DiscountPercent;
var TotalAmount = GrossAmount * DiscountPercent;
}
function elsestatement(){
if (ProductType == 'A') {
ProductPrice = 100;
} else if (ProductType == 'B') {
ProductPrice = 75;
} else if (ProductType == 'C'){
ProductPrice = 50;
} else {}
if (ProductQty < 1|| ProductQty > 100) {}
console.log('ProductPrice: ', ProductPrice);
}
function discountAmt() {
if (GrossAmount < 200) {
DiscountPercent = '0';
} else if (GrossAmount >= 200 && GrossAmount <= 399.99) {
DiscountPercent = '.05';
} else if (GrossAmount >= 400 && GrossAmount <= 599.99) {
DiscountPercent = '.075';
} else if (GrossAmount >= 600) {
DiscountPercent = '.1';
}
console.log('DiscountPercent: ', DiscountPercent);
}
calculate();