正如标题所示，我在为我的产品分配折扣时遇到问题。当我加载页面时，它显示 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
抱歉造成困惑。我对未关闭的功能有误解。相反，问题在于 GrossAmount 是在 calculate 函数中定义的，而不是在外部作用域中定义的。因此，在 discountAmt 函数中无法访问它。
这是您的固定代码，除了删除了 document.write 以便它可以在沙箱中运行:
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();关于javascript - 难以分配折扣，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/42942384/