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<html lang="en"><head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
<meta name="description" content="">
<meta name="author" content="">
<link rel="icon" href="https://getbootstrap.com/docs/3.4/favicon.ico">
<link rel="canonical" href="https://getbootstrap.com/docs/3.4/examples/jumbotron-narrow/">
<title>Luna's Pizza Online Order Form</title>
<!--MAIN CSS-->
<link href="css/style.css" rel="stylesheet">
<!-- Bootstrap core CSS -->
<link href="./index_files/bootstrap.min.css" rel="stylesheet">
<!-- IE10 viewport hack for Surface/desktop Windows 8 bug -->
<link href="./index_files/ie10-viewport-bug-workaround.css" rel="stylesheet">
<!-- Custom styles for this template -->
<link href="./index_files/jumbotron-narrow.css" rel="stylesheet">
<link rel="stylesheet" href="../css/style.css">
<!-- Just for debugging purposes. Don't actually copy these 2 lines! -->
<!--[if lt IE 9]><script src="../../assets/js/ie8-responsive-file-warning.js"></script><![endif]-->
<script src="./index_files/ie-emulation-modes-warning.js.download"></script>
<!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
<!--[if lt IE 9]>
<script src="https://oss.maxcdn.com/html5shiv/3.7.3/html5shiv.min.js"></script>
<script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
<![endif]-->
</head>
<body>
<div class="container">
<div class="header clearfix">
<h3 class="text-muted">Luna's Pizza</h3>
</div>
<span id="initialSpan"><div class="jumbotron">
<h1>Jumbotron heading</h1>
<p class="lead">Cras justo odio, dapibus ac facilisis in, egestas eget quam. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus.</p>
<p><a class="btn btn-lg btn-success" href="https://getbootstrap.com/docs/3.4/examples/jumbotron-narrow/#" role="button">Sign up today</a></p>
</div></span>
<div class="row marketing">
<div class="col-lg-12">
<hr>
<form id="orderPizzaForm" action="" method="post" onSubmit="'#'();">
<span id="deliverySpan">
<h4>Delivery Location</h4>
<label>Name:</label>
<input type="text" name="name" id="deliveryName"><span id="deliveryNameError"></span><br>
<label>Address Type:</label>
<select id="deliveryAddressType" name= "deliveryAddressType">
<option value="selectAddress">--- Please Select ---</option>
<option value ="house">House</option>
<option value ="apartment">Apartment</option>
<option value ="business">Business</option>
<option value="campus">Campus</option>
<option value="hotel">Hotel</option>
<option value="dorm">Dorm</option>
<option value="other">Other</option>
</select><span id="deliveryAddressTypeError"></span><br>
<div id=deliveryOtherAddress>
<label for="nameInput">What type of Address?</label><input type="text" id="nameInput" /><br>
</div>
<label>Street Address:</label>
<input type="text" name="streetAddress" id="deliveryStreetAddress"><span id = "deliveryStreetAddressError"></span><br>
<label>Optional Apartment Number:</label>
<input type="text" name="apartmentNumber"><br>
<label>Suite or Room Number:</label>
<input type="text" name="suiteRoomNumber"><br>
<label>City:</label>
<input type="text" name="city" id="deliveryCity"><span id="deliveryCityError"></span><br>
<label>State:</label>
<input type="text" name="state" id="deliveryState"><span id="deliveryStateError"></span><br>
<label>Zip Code:</label>
<input type="text" name="zipCode" id="deliveryZip"><span id="deliveryZipError"></span><br>
<label>Phone Number:</label>
<input type="tel" name="phonenumber" title="Ex: 555-555-5555" id="deliveryPhoneNumber"><span id="deliveryPhoneNumberError"></span><br>
<label>Email:</label>
<input type="email" name="email" id="deliveryEmail"><span id="deliveryEmailError"></span><br>
<br>
<input type="button" id="verifyDeliveryAddress" value="Submit">
<hr>
</span>
<span id="doughSpan">
<h4>Build Your Order</h4>
<label>Dough Options:</label><br>
<span id="doughOptionsSpan">
<input type="radio" name="doughOptions" value="handTossed" id="handTossed">Hand Tossed<br>
<input type="radio" name="doughOptions" value="thinCrust" id="thinCrust">Thin Crust<br>
<input type="radio" name="doughOptions" value="nyStyle" id="nYStyle">New York Style<br>
<input type="radio" name="doughOptions" value="glutenFree" id="glutenFree">Gluten Free
</span>
<hr>
</span>
<!--BEGIN SPAN FOR PIZZA SIZES-->
<span id="pizzaSizePricesSpan">
<label>Choose your pizza size and price.</label><br>
<select id="pizzaSizePrices" name= "pizzaSizePrices">
<!--<option value="selectSize/Price">--- Please Select Size/Price---</option>-->
</select><span id="pizzaSizePricesError"></span><br>
<hr>
</span>
<!--END SPAN FOR PIZZA SIZES-->
<span id="toppingsSpan"> <!--style="visibility: hidden"-->
<label>Cheese Options:</label>
<select name="cheeseOptions">
<option>Light: no charge</option>
<option>Normal(default): no charge</option>
<option>Extra: +$2.99</option>
<option>Double: +$3.99</option>
</select>
<hr>
<label>Sauce Options:</label>
<select name="sauceOptions">
<option>Regular Tomato: no charge</option>
<option>Hearty Tomato: +$.99</option>
<option>BBQ Sauce: +$1.99</option>
</select>
<hr>
<label>Toppings:</label><br>
<input type="checkbox" name="toppings" id="pepperoni" value="pepperoni"> Pepperoni<br>
<input type="checkbox" name="toppings" id="sausage" value="sausage"> Sausage<br>
<input type="checkbox" name="toppings" id="ham" value="ham"> Ham<br>
<input type="checkbox" name="toppings" id="" value="bacon"> Bacon<br>
<input type="checkbox" name="toppings" id="salami" value="salami"> Salami<br>
<input type="checkbox" name="toppings" id="peppers" value="peppers"> Peppers<br>
<input type="checkbox" name="toppings" id="olives" value="olives"> Olives<br>
<input type="checkbox" name="toppings" id="jalapenos" value="jalapenos"> Jalapenos<br>
<input type="checkbox" name="toppings" id="mushrooms" value="mushrooms"> Mushrooms<br>
<input type="checkbox" name="toppings" id="pineapple" value="pineapple"> Pineapple<br>
<input type="checkbox" name="toppings" id="onion" value="onion"> Onion<br>
<hr>
<input type="button" id="proceedToBilling" value="Proceed to Billing">
</span>
<span id="orderAndBillingSpan">
<h4>Billing Information</h4>
<input type="checkbox" name="sameAsDeliveryInfo" id="sameAs" value="sameAs">
<label>Same as Delivery Information</label><br><br>
<label>Name:</label>
<input type="text" name="name">
<hr>
<label>Address Type:</label>
<select name="addresstype">
<option>House</option>
<option>Apartment</option>
<option>Business</option>
<option>Campus</option>
<option>Hotel</option>
<option>Dorm</option>
<option>Other</option>
</select>
<hr>
<label>Street Address:</label>
<input type="text" name="streetAddress">
<hr>
<label>Optional Apartment Number:</label>
<input type="text" name="apartmentNumber">
<hr>
<label>Suite or Room Number:</label>
<input type="text" name="suiteRoomNumber">
<hr>
<label>City:</label>
<input type="text" name="city">
<hr>
<label>State:</label>
<input type="text" name="state">
<hr>
<label>Zip Code:</label>
<input type="text" name="zipCode">
<hr>
<h4>Payment Information</h4><br>
<label>Credit Card Information:</label>
<input type="text" name="creditCardInfo"><br>
<hr>
<label>CVC Code:</label>
<input type="text" name="cvcCode"><br>
<hr>
<label>Expiration Date:</label>
<select name="expirationDate">
<option>2019</option>
<option>2020</option>
<option>2021</option>
<option>2022</option>
<option>2023</option>
</select>
<br>
<button id="submitOrder">Submit Order</button>
</span>
</form>
</div>
</div>
<footer class="footer">
<p>© 2019 Company, Inc.</p>
</footer>
</div> <!-- /container -->
<!-- IE10 viewport hack for Surface/desktop Windows 8 bug -->
<script src="./index_files/ie10-viewport-bug-workaround.js.download"></script>
<!--MAIN JS-->
<script src="script/script.js"></script>
</body></html>我正在尝试将嵌套对象添加到选择下拉框中，这些对象也嵌套在一个数组中，该数组全部嵌套在对象文字中。根据用户想要的披萨饼皮类型，选择框将以编程方式用可用的适当尺寸以及该类型饼皮的价格填充选择元素。在我的脚本中，我首先清除选择元素，然后循环遍历对象文字，并将其添加到选择框。当它填充选择框时，我注意到，如果用户想要更改披萨的饼皮类型，则尺寸和价格会从一种饼皮转移到另一种饼皮。例如，当用户单击无麸质面包皮，然后更改为纽约风格面包皮，然后再次返回无麸质面包皮时，纽约风格的尺寸和价格将转移到无麸质选项。这是怎么回事？我该如何解决这个问题？
var $ = function (id) {
"use strict";
return window.document.getElementById(id);
};
var phase;
var phases = {
initialSpan: 0,
deliveryAddress: 1,
crustType: 2,
doughType_Prices_Size: 3,
crustToppings: 4,
billingInfo: 5
};
//DISPLAYING ELEMENTS IN CORRECT PHASES
function updateDisplay() {
"use strict";
var initialSpan = $('initialSpan'),
deliverySpan = $('deliverySpan'),
doughSpan = $('doughSpan'),
pizzaSizePricesSpan = $('pizzaSizePricesSpan'),
toppingsSpan = $('toppingsSpan'),
orderAndBillingSpan = $('orderAndBillingSpan');
if (phase === phases.initialSpan) {
// INITIAL PHASE
initialSpan.style.display = "block";
deliverySpan.style.display = "none";
doughSpan.style.display = "none";
pizzaSizePricesSpan.style.display = "none";
toppingsSpan.style.display = "none";
orderAndBillingSpan.style.display = "none";
} else if (phase === phases.deliveryAddress) {
// DELIVERY ADDRESS
initialSpan.style.display = "none";
deliverySpan.style.display = "block";
doughSpan.style.display = "none";
pizzaSizePricesSpan.style.display = "none";
toppingsSpan.style.display = "none";
orderAndBillingSpan.style.display = "none";
} else if (phase === phases.crustType) {
//CRUST TYPE
deliverySpan.style.display = "none";
doughSpan.style.display = "block";
pizzaSizePricesSpan.style.display = "none";
toppingsSpan.style.display = "none";
orderAndBillingSpan.style.display = "none";
} else if (phase === phases.doughType_Prices_Size) {
//DOUGHTYPE AND SIZES/PRICES
deliverySpan.style.display = "none";
doughSpan.style.display = "block";
pizzaSizePricesSpan.style.display = "block";
toppingsSpan.style.display = "none";
orderAndBillingSpan.style.display = "none";
} else if (phase === phases.crustToppings) {
//CRUST AND TOPPINGS
deliverySpan.style.display = "none";
doughSpan.style.display = "block";
pizzaSizePricesSpan.style.display = "block";
toppingsSpan.style.display = "block";
orderAndBillingSpan.style.display = "none";
} else if (phase === phases.billingInfo) {
//BILLING INFO
deliverySpan.style.display = "none";
doughSpan.style.display = "none";
pizzaSizePricesSpan.style.display = "none";
toppingsSpan.style.display = "none";
orderAndBillingSpan.style.display = "block";
}
}
function nextPhase(currentPhase) {
"use strict";
phase = currentPhase + 1;
updateDisplay();
}
function setPhase(newPhase) {
"use strict";
phase = newPhase;
updateDisplay();
}
var pizzaSizePrices = {
"handTossed": [
{ size: "Small", price: 9.99 },
{ size: "Medium", price: 12.99},
{ size: "large", price: 14.99}
],
"thinCrust": [
{ size: "Medium", price: 11.99},
{ size: "large", price: 13.99}
],
"nyStyle": [
{ size: "Medium", price: 16.99},
{ size: "Extra Large", price: 19.99}
],
"glutenFree": [
{ size: "small", price: 10.99}
]
};
function verifyDoughOption() {
"use strict";
var doughType, s, selection = $('pizzaSizePrices'), sizePrice;
if ($('handTossed').checked) {
doughType = "handTossed";
} else if ($('thinCrust').checked) {
doughType = $('thinCrust').value;
} else if ($('nYStyle').checked) {
doughType = $('nYStyle').value;
} else if ($('glutenFree').checked) {
doughType = $('glutenFree').value;
} else {
doughType = "none";
setPhase(phases.crustType);
return;
}
sizePrice = pizzaSizePrices[doughType];
// Clear selection (select box)
for (var i = 0; i < selection.options.length; i++) {
// CLEAR
selection.options[i] = null;
}
// Loop over sizePrice
for (i = 0; i < sizePrice.length; i++) {
// Build string
s = sizePrice[i].size + " ($" + sizePrice[i].price + ")";
var option = document.createElement('option');
option.text = s;
selection.add(option);
}
// Add to selection
nextPhase(phases.crustType);
}
function init() {
"use strict";
//SETS PHASE FOR INITIAL SPAN
setPhase(phases.initialSpan);
//EVENT FOR INITIAL PHASE
$('initialSpan').addEventListener('click', proceedToOrder);
//EVENT LISTENER FOR OTHER
$('deliveryAddressType').addEventListener("click", otherAddressShowHide);
//EVENT LISTENER FOR DELIVERY SUBMIT BUTTON
$('verifyDeliveryAddress').addEventListener("click", verifyDeliveryAddress);
$('doughOptionsSpan').addEventListener("click", verifyDoughOption);
//EVENT LISTENER FOR DOUGH OPTIONS VALUE
$('pizzaSizePrices').addEventListener("click", verifyPizzaSizePrice);
//EVENT LISTENER FOR PROCEED TO BILLING
$('proceedToBilling').addEventListener("click", proceedToBilling);
//SUBMITS PLACE ORDER
$('orderPizzaForm').onsubmit = placeOrder;
}
window.addEventListener("load", init);<span id="doughOptionsSpan">
<input type="radio" name="doughOptions" value="handTossed" id="handTossed">Hand Tossed<br>
<input type="radio" name="doughOptions" value="thinCrust" id="thinCrust">Thin Crust<br>
<input type="radio" name="doughOptions" value="nyStyle" id="nYStyle">New York Style<br>
<input type="radio" name="doughOptions" value="glutenFree" id="glutenFree">Gluten Free
</span>
<span id="pizzaSizePricesSpan">
<label>Choose your pizza size and price.</label><br>
<select id="pizzaSizePrices" name= "pizzaSizePrices">
</select><span id="pizzaSizePricesError">
</span><br>
</span>最佳答案
您可以使用以下代码来清除选择框中的选项。这将解决问题。
// Clear selection (select box)
selection.options.length = 0;
/* Comment this
for (var i = 0; i < selection.options.length; i++) {
// CLEAR
selection.options[i] = null;
}
*/
var $ = function(id) {
"use strict";
return window.document.getElementById(id);
};
var phase;
var phases = {
initialSpan: 0,
deliveryAddress: 1,
crustType: 2,
doughType_Prices_Size: 3,
crustToppings: 4,
billingInfo: 5
};
//DISPLAYING ELEMENTS IN CORRECT PHASES
function updateDisplay() {
"use strict";
var initialSpan = $('initialSpan'),
deliverySpan = $('deliverySpan'),
doughSpan = $('doughSpan'),
pizzaSizePricesSpan = $('pizzaSizePricesSpan'),
toppingsSpan = $('toppingsSpan'),
orderAndBillingSpan = $('orderAndBillingSpan');
//console.log(initialSpan, //document.getElementById('initialSpan'));
if (phase === phases.initialSpan) {
// INITIAL PHASE
initialSpan.style.display = "block";
deliverySpan.style.display = "none";
//doughSpan.style.display = "none";
//pizzaSizePricesSpan.style.display = "none";
//toppingsSpan.style.display = "none";
//orderAndBillingSpan.style.display = "none";
} else if (phase === phases.deliveryAddress) {
// DELIVERY ADDRESS
initialSpan.style.display = "none";
deliverySpan.style.display = "block";
doughSpan.style.display = "none";
pizzaSizePricesSpan.style.display = "none";
toppingsSpan.style.display = "none";
orderAndBillingSpan.style.display = "none";
} else if (phase === phases.crustType) {
//CRUST TYPE
deliverySpan.style.display = "none";
doughSpan.style.display = "block";
//pizzaSizePricesSpan.style.display = "none";
//toppingsSpan.style.display = "none";
//orderAndBillingSpan.style.display = "none";
} else if (phase === phases.doughType_Prices_Size) {
//DOUGHTYPE AND SIZES/PRICES
deliverySpan.style.display = "none";
doughSpan.style.display = "block";
pizzaSizePricesSpan.style.display = "block";
toppingsSpan.style.display = "none";
orderAndBillingSpan.style.display = "none";
} else if (phase === phases.crustToppings) {
//CRUST AND TOPPINGS
deliverySpan.style.display = "none";
doughSpan.style.display = "block";
pizzaSizePricesSpan.style.display = "block";
toppingsSpan.style.display = "block";
orderAndBillingSpan.style.display = "none";
} else if (phase === phases.billingInfo) {
//BILLING INFO
deliverySpan.style.display = "none";
doughSpan.style.display = "none";
pizzaSizePricesSpan.style.display = "none";
toppingsSpan.style.display = "none";
orderAndBillingSpan.style.display = "block";
}
}
function nextPhase(currentPhase) {
"use strict";
phase = currentPhase + 1;
updateDisplay();
}
function setPhase(newPhase) {
"use strict";
phase = newPhase;
updateDisplay();
}
var pizzaSizePrices = {
"handTossed": [{
size: "Small",
price: 9.99
},
{
size: "Medium",
price: 12.99
},
{
size: "large",
price: 14.99
}
],
"thinCrust": [{
size: "Medium",
price: 11.99
},
{
size: "large",
price: 13.99
}
],
"nyStyle": [{
size: "Medium",
price: 16.99
},
{
size: "Extra Large",
price: 19.99
}
],
"glutenFree": [{
size: "small",
price: 10.99
}]
};
function verifyDoughOption() {
"use strict";
var doughType, s, selection = $('pizzaSizePrices'),
sizePrice;
if ($('handTossed').checked) {
doughType = "handTossed";
} else if ($('thinCrust').checked) {
doughType = $('thinCrust').value;
} else if ($('nYStyle').checked) {
doughType = $('nYStyle').value;
} else if ($('glutenFree').checked) {
doughType = $('glutenFree').value;
} else {
doughType = "none";
setPhase(phases.crustType);
return;
}
sizePrice = pizzaSizePrices[doughType];
// Clear selection (select box)
selection.options.length = 0;
/*
for (var i = 0; i < selection.options.length; i++) {
// CLEAR
//selection.options[i] = null;
selection.remove(i);
}
*/
// Loop over sizePrice
for (let i = 0; i < sizePrice.length; i++) {
// Build string
s = sizePrice[i].size + " ($" + sizePrice[i].price + ")";
var option = document.createElement('option');
option.text = s;
selection.add(option);
}
// Add to selection
nextPhase(phases.crustType);
}
function init() {
"use strict";
//SETS PHASE FOR INITIAL SPAN
setPhase(phases.initialSpan);
//EVENT FOR INITIAL PHASE
//$('initialSpan').addEventListener('click', proceedToOrder);
//EVENT LISTENER FOR OTHER
//$('deliveryAddressType').addEventListener("click", otherAddressShowHide);
//EVENT LISTENER FOR DELIVERY SUBMIT BUTTON
//$('verifyDeliveryAddress').addEventListener("click", verifyDeliveryAddress);
$('doughOptionsSpan').addEventListener("click", verifyDoughOption);
//EVENT LISTENER FOR DOUGH OPTIONS VALUE
//$('pizzaSizePrices').addEventListener("click", verifyPizzaSizePrice);
//EVENT LISTENER FOR PROCEED TO BILLING
$('proceedToBilling').addEventListener("click", proceedToBilling);
//SUBMITS PLACE ORDER
//$('orderPizzaForm').onsubmit = placeOrder;
}
document.addEventListener("DOMContentLoaded", init, false);
//window.document.body.addEventListener("load", init);<body>
<div class="container">
<div class="header clearfix">
<h3 class="text-muted">Luna's Pizza</h3>
</div>
<span id="initialSpan"><div class="jumbotron">
<h1>Jumbotron heading</h1>
<p class="lead">Cras justo odio, dapibus ac facilisis in, egestas eget quam. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus.</p>
<p><a class="btn btn-lg btn-success" href="https://getbootstrap.com/docs/3.4/examples/jumbotron-narrow/#" role="button">Sign up today</a></p>
</div></span>
<div class="row marketing">
<div class="col-lg-12">
<hr>
<form id="orderPizzaForm" action="" method="post" onSubmit="'#'();">
<span id="deliverySpan">
<h4>Delivery Location</h4>
<label>Name:</label>
<input type="text" name="name" id="deliveryName"><span id="deliveryNameError"></span><br>
<label>Address Type:</label>
<select id="deliveryAddressType" name= "deliveryAddressType">
<option value="selectAddress">--- Please Select ---</option>
<option value ="house">House</option>
<option value ="apartment">Apartment</option>
<option value ="business">Business</option>
<option value="campus">Campus</option>
<option value="hotel">Hotel</option>
<option value="dorm">Dorm</option>
<option value="other">Other</option>
</select><span id="deliveryAddressTypeError"></span><br>
<div id=deliveryOtherAddress>
<label for="nameInput">What type of Address?</label><input type="text" id="nameInput" /><br>
</div>
<label>Street Address:</label>
<input type="text" name="streetAddress" id="deliveryStreetAddress"><span id = "deliveryStreetAddressError"></span><br>
<label>Optional Apartment Number:</label>
<input type="text" name="apartmentNumber"><br>
<label>Suite or Room Number:</label>
<input type="text" name="suiteRoomNumber"><br>
<label>City:</label>
<input type="text" name="city" id="deliveryCity"><span id="deliveryCityError"></span><br>
<label>State:</label>
<input type="text" name="state" id="deliveryState"><span id="deliveryStateError"></span><br>
<label>Zip Code:</label>
<input type="text" name="zipCode" id="deliveryZip"><span id="deliveryZipError"></span><br>
<label>Phone Number:</label>
<input type="tel" name="phonenumber" title="Ex: 555-555-5555" id="deliveryPhoneNumber"><span id="deliveryPhoneNumberError"></span><br>
<label>Email:</label>
<input type="email" name="email" id="deliveryEmail"><span id="deliveryEmailError"></span><br>
<br>
<input type="button" id="verifyDeliveryAddress" value="Submit">
<hr>
</span>
<span id="doughSpan">
<h4>Build Your Order</h4>
<label>Dough Options:</label><br>
<span id="doughOptionsSpan">
<input type="radio" name="doughOptions" value="handTossed" id="handTossed">Hand Tossed<br>
<input type="radio" name="doughOptions" value="thinCrust" id="thinCrust">Thin Crust<br>
<input type="radio" name="doughOptions" value="nyStyle" id="nYStyle">New York Style<br>
<input type="radio" name="doughOptions" value="glutenFree" id="glutenFree">Gluten Free
</span>
<hr>
</span>
<!--BEGIN SPAN FOR PIZZA SIZES-->
<span id="pizzaSizePricesSpan">
<label>Choose your pizza size and price.</label><br>
<select id="pizzaSizePrices" name= "pizzaSizePrices">
<!--<option value="selectSize/Price">--- Please Select Size/Price---</option>-->
</select><span id="pizzaSizePricesError"></span><br>
<hr>
</span>
<!--END SPAN FOR PIZZA SIZES-->
<span id="toppingsSpan"> <!--style="visibility: hidden"-->
<label>Cheese Options:</label>
<select name="cheeseOptions">
<option>Light: no charge</option>
<option>Normal(default): no charge</option>
<option>Extra: +$2.99</option>
<option>Double: +$3.99</option>
</select>
<hr>
<label>Sauce Options:</label>
<select name="sauceOptions">
<option>Regular Tomato: no charge</option>
<option>Hearty Tomato: +$.99</option>
<option>BBQ Sauce: +$1.99</option>
</select>
<hr>
<label>Toppings:</label><br>
<input type="checkbox" name="toppings" id="pepperoni" value="pepperoni"> Pepperoni<br>
<input type="checkbox" name="toppings" id="sausage" value="sausage"> Sausage<br>
<input type="checkbox" name="toppings" id="ham" value="ham"> Ham<br>
<input type="checkbox" name="toppings" id="" value="bacon"> Bacon<br>
<input type="checkbox" name="toppings" id="salami" value="salami"> Salami<br>
<input type="checkbox" name="toppings" id="peppers" value="peppers"> Peppers<br>
<input type="checkbox" name="toppings" id="olives" value="olives"> Olives<br>
<input type="checkbox" name="toppings" id="jalapenos" value="jalapenos"> Jalapenos<br>
<input type="checkbox" name="toppings" id="mushrooms" value="mushrooms"> Mushrooms<br>
<input type="checkbox" name="toppings" id="pineapple" value="pineapple"> Pineapple<br>
<input type="checkbox" name="toppings" id="onion" value="onion"> Onion<br>
<hr>
<input type="button" id="proceedToBilling" value="Proceed to Billing">
</span>
<span id="orderAndBillingSpan">
<h4>Billing Information</h4>
<input type="checkbox" name="sameAsDeliveryInfo" id="sameAs" value="sameAs">
<label>Same as Delivery Information</label><br><br>
<label>Name:</label>
<input type="text" name="name">
<hr>
<label>Address Type:</label>
<select name="addresstype">
<option>House</option>
<option>Apartment</option>
<option>Business</option>
<option>Campus</option>
<option>Hotel</option>
<option>Dorm</option>
<option>Other</option>
</select>
<hr>
<label>Street Address:</label>
<input type="text" name="streetAddress">
<hr>
<label>Optional Apartment Number:</label>
<input type="text" name="apartmentNumber">
<hr>
<label>Suite or Room Number:</label>
<input type="text" name="suiteRoomNumber">
<hr>
<label>City:</label>
<input type="text" name="city">
<hr>
<label>State:</label>
<input type="text" name="state">
<hr>
<label>Zip Code:</label>
<input type="text" name="zipCode">
<hr>
<h4>Payment Information</h4><br>
<label>Credit Card Information:</label>
<input type="text" name="creditCardInfo"><br>
<hr>
<label>CVC Code:</label>
<input type="text" name="cvcCode"><br>
<hr>
<label>Expiration Date:</label>
<select name="expirationDate">
<option>2019</option>
<option>2020</option>
<option>2021</option>
<option>2022</option>
<option>2023</option>
</select>
<br>
<button id="submitOrder">Submit Order</button>
</span>
</form>
</div>
</div>
<footer class="footer">
<p>© 2019 Company, Inc.</p>
</footer>
</div> <!-- /container -->
<!-- IE10 viewport hack for Surface/desktop Windows 8 bug -->
</body>关于javascript - 为什么我的对象没有在 JavaScript 中以编程方式正确添加到选择元素？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/56141231/
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这个问题在这里已经有了答案: Is there a workaround to make CSS classes with names that start with numbers valid?
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