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這是代碼。如果我打開模式，關閉按鈕將不起作用，直到刷新頁面纔會關閉。模式關閉按鈕不起作用
// Get the modal
var modal = document.getElementById('myModal');
// Get the button that opens the modal
var btn = document.getElementById("myBtn");
// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];
// When the user clicks the button, open the modal
btn.onclick = function() {
modal.style.display = "block";
}
// When the user clicks on <span> (x), close the modal
span.onclick = function() {
modal.style.display = "none";
}
// When the user clicks anywhere outside of the modal, close it
window.onclick = function(event) {
if (event.target == modal) {
modal.style.display = "none";
}
}/* Create three columns of equal width */
.columns {
float: left;
width: 33.3%;
padding: 8px;
}
/* Style the list */
.price {
list-style-type: none;
border: 1px solid #eee;
margin: 0;
padding: 0;
-webkit-transition: 0.3s;
transition: 0.3s;
}
/* Add shadows on hover */
.price:hover {
box-shadow: 0 8px 12px 0 rgba(0, 0, 0, 0.2)
}
/* Pricing header */
.price .header {
background-color: #111;
color: white;
font-size: 25px;
}
/* List items */
.price li {
border-bottom: 1px solid #eee;
padding: 20px;
text-align: center;
}
/* Grey list item */
.price .grey {
background-color: #eee;
font-size: 20px;
}
/* The "Sign Up" button */
.button {
background-color: #4CAF50;
border: none;
color: white;
padding: 10px 25px;
text-align: center;
text-decoration: none;
font-size: 18px;
}
/* Change the width of the three columns to 100%
(to stack horizontally on small screens) */
@media only screen and (max-width: 600px) {
.columns {
width: 100%;
}
}
/* The Modal (background) */
.modal {
display: none;
/* Hidden by default */
position: fixed;
/* Stay in place */
z-index: 1;
/* Sit on top */
left: 0;
top: 0;
width: 100%;
/* Full width */
height: 100%;
/* Full height */
overflow: auto;
/* Enable scroll if needed */
background-color: rgb(0, 0, 0);
/* Fallback color */
background-color: rgba(0, 0, 0, 0.4);
/* Black w/ opacity */
}
/* Modal Content/Box */
.modal-content {
background-color: #fefefe;
margin: 15% auto;
/* 15% from the top and centered */
padding: 20px;
border: 1px solid #888;
width: 80%;
/* Could be more or less, depending on screen size */
}
/* The Close Button */
.close {
color: #aaa;
float: right;
font-size: 28px;
font-weight: bold;
}
.close:hover,
.close:focus {
color: black;
text-decoration: none;
cursor: pointer;
}<div class="columns">
<ul class="price">
<li class="header">Hard Drive Format</li>
<li class="grey">£10</li>
<li>Format Hard Drive</li>
<li>Removes ALL Files From Drive</li>
<li>Fresh Install Windows</li>
<li class="grey"><button onclick="document.getElementById('myModal').style.display='block'">Sign
Up</button></li>
</ul>
</div>
<!-- The Modal -->
<div id="myModal" class="modal">
<!-- Modal content -->
<div class="modal-content">
<span class="close">×</span>
<p>Some text in the Modal..</p>
</div>
</div>所有我想要的是模態單擊該按鈕時關閉。