用JavaScript函数计算营业税
[英]Calculating Sales Tax in a javascript function
问题描述
I am having trouble calculating tax and then adding it to the subtotal. 
我在计算税款并将其添加到小计时遇到了麻烦。 Just so you are aware I am very new to coding in general. 如此一来，您就知道我对编码总体而言还是一个新手。 the goal is to have the tirePrice,tireAmount, and tireFees all added up and taxed and then the coupons should be taken off. 目标是将TirePrice，tireAmount和tireFees全部累加并征税，然后应将优惠券取走。 also if you have any tips to improve let me know but as I said keep in mind I am very new to this. 另外，如果您有任何改进的秘诀，请告诉我，但正如我所说的，请记住，我对此很陌生。 Thank you for your time :). 感谢您的时间 ：）。
function computePrice() { var tirePrice = document.getElementById('tirePrice').value; var tireAmount = document.getElementById('tireAmount').value; var tireFees = document.getElementById('tireFees').value; var tireCoupons = document.getElementById('tireCoupons').value; var finalPrice = ((+tirePrice * +tireAmount + +tireFees) * .8 - +tireCoupons).toFixed(2); finalPrice = finalPrice.toString().replace(/\\B(?=(\\d{3})+(?!\\d))/g, ","); document.getElementById('finalPrice').innerHTML = "Total:$" + finalPrice; }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>BJ's Tire Bay Calculator</title> <link rel="stylesheet" type="text/css" href="styles.css"> </head> <body> <h1>BJ's Tire Bay Calculator </h1> <p>Price Per Tire: $ <input id="tirePrice" type="number" min="1" max="100000"></p> <p>Number Of Tires: <input id="tireAmount" type="number" min="1" max="4"></p> <p>Installation Fee and NYS Recycling Fee: $<input id="tireFees" type="number" min="1" max="70"></p> <p>Coupons: $ <input id="tireCoupons" type="number" max="100000"></p> <input id="displayNum" value="Calculate" type="button" onclick="computePrice()"> <h2 id="finalPrice"></h2> </body> <script src="index.js"></script> </html>
1 个解决方案
解决方案1
0 已采纳 2019-01-18 23:30:23
You need to figure out how you're going to calculate sales tax first. 您需要先弄清楚如何计算营业税。 You can look into other resources but this one seems to give a good example. 你可以看看其他的资源，但是这一次似乎给一个很好的例子。 There's also inclusive and exclusive sales tax. 还有包含性和排他性的营业税。 I'm not getting into that -- 我不明白这一点-
Once you have that math, you can then do something similar: 一旦有了该数学，就可以执行类似的操作：
const calculateSalesTax = (amount, taxPercent) => { // Whatever math is involved to calculate your sales tax here return amount + (taxPercent * amount); }; document.getElementById('calculate').onclick = () => { const amount = document.getElementById('amount').value; const tax = document.getElementById('percent').value; document.getElementById('total').innerText = `$ ${calculateSalesTax(+amount, +tax)}`; };
<label for="amount">Amount</label> <input type="number" placeholder="amount" id="amount" /> <label for="percent">Sales Tax</label> <input type="number" placeholder="percent" id="percent" /> <button id="calculate">Calculate</button> <div id="total"></div>
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