我已经使用html，css和JavaScript创建了一个模式
我添加了一个图片类别为“ pic”的图片
当您打开模式窗口时，您会在顶部看到图像
在css中，我定义了类pic .. [display：block;和保证金：auto; ] 仍未将其水平居中。
下面附有完整的编码
$(function(){
// Get the button that opens the modal
// read all the control of any type which has class as modal-button
var btn = document.querySelectorAll(".modal-button");
// All page modals
var modals = document.querySelectorAll('.modal');
// Get the <span> element that closes the modal
var spans = document.getElementsByClassName("close");
// When the user clicks the button, open the modal
for (var i = 0; i < btn.length; i++) {
btn[i].onclick = function(e) {
e.preventDefault();
modal = document.querySelector(e.target.getAttribute("href"));
modal.style.display = "block";
}
}
// When the user clicks on <span> (x), close the modal
for (var i = 0; i < spans.length; i++) {
spans[i].onclick = function() {
for (var index in modals) {
if (typeof modals[index].style !== 'undefined') modals[index].style.display = "none";
}
}
}
// When the user clicks anywhere outside of the modal, close it
window.onclick = function(event) {
if (event.target.classList.contains('modal')) {
for (var index in modals) {
if (typeof modals[index].style !== 'undefined') modals[index].style.display = "none";
}
}
}
})@import url('https://fonts.googleapis.com/css?family=Quicksand&display=swap');
/* The Modal (background) */
.modal {
box-sizing: border-box;
font-family: 'Quicksand', sans-serif;
display: none; /* Hidden by default */
position: fixed; /* Stay in place */
z-index: 1; /* Sit on top */
padding-top: 100px; /* Location of the box */
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 */
.modal-content {
color: white;
position: relative;
background-color: #171B20;
margin: auto;
padding: 0;
border: 1px solid #888;
width: 80%;
box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2),0 6px 20px 0 rgba(0,0,0,0.19);
-webkit-animation-name: animatetop;
-webkit-animation-duration: 0.4s;
animation-name: animatetop;
animation-duration: 0.4s
}
/* Add Animation */
@-webkit-keyframes animatetop {
from {top:-300px; opacity:0}
to {top:0; opacity:1}
}
@keyframes animatetop {
from {top:-300px; opacity:0}
to {top:0; opacity:1}
}
/* The Close Button */
.close {
color: #F0B823;
float: right;
font-size: 40px;
font-weight: bold;
}
.close:hover,
.close:focus {
color: #fff;
text-decoration: none;
cursor: pointer;
}
.modal-header {
padding: 2px 16px;
background-color: #171B20;
color: #F0B823;
}
.modal-body {
}
.modal-button {
font-family: 'Quicksand', sans-serif;
background-color: #171B20;
border: none;
color: white;
padding: 8px 16px;
text-align: left;
text-decoration: none;
display: inline-block;
font-size: 16px;
margin: 4px 2px;
-webkit-transition-duration: 0.4s; /* Safari */
transition-duration: 0.4s;
cursor: pointer;
width: auto;
font-size: 200%;
}
.modal-button:hover {
background-color: #171B20;
color: #F0B823;
}
.pic {
margin: auto;
display: block;
height: auto;
width: 60%;
}
.headertext {
font-family: 'Quicksand', sans-serif;
display: block;
text-align: center;
font-size: 30px;
}
.bodytext {
font-family: 'Quicksand', sans-serif;
display: block;
padding: 10px 15px;
}
@media screen and (min-width: 767px) {
.pic {
margin: auto;
display: block;
height: auto;
width: 35%;
}
}
p {
display: block;
margin: 0;
}<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<!-- Trigger/Open The Modal -->
<button class="modal-button" href="#myModal1">• Click Me</button>
<!-- The Modal -->
<div id="myModal1" class="modal">
<!-- Modal content -->
<div class="modal-content">
<div class="modal-header">
<span class="close">×</span>
<div class="headertext">
<p>Modal Header</p>
</div>
</div>
<div class="modal-body">
<img class="pic" src="https://drive.google.com/thumbnail?id=108ZLeoIfNkKODfRbLuPWpmXRl0gH9qkD">
<div class="bodytext">
<p>Body Text Comes here</p>
</div>
</div>
</div>
</div>
答案 0 :(得分：1)
检查更新的代码。
$(function(){
// Get the button that opens the modal
// read all the control of any type which has class as modal-button
var btn = document.querySelectorAll(".modal-button");
// All page modals
var modals = document.querySelectorAll('.modal');
// Get the <span> element that closes the modal
var spans = document.getElementsByClassName("close");
// When the user clicks the button, open the modal
for (var i = 0; i < btn.length; i++) {
btn[i].onclick = function(e) {
e.preventDefault();
modal = document.querySelector(e.target.getAttribute("href"));
modal.style.display = "block";
}
}
// When the user clicks on <span> (x), close the modal
for (var i = 0; i < spans.length; i++) {
spans[i].onclick = function() {
for (var index in modals) {
if (typeof modals[index].style !== 'undefined') modals[index].style.display = "none";
}
}
}
// When the user clicks anywhere outside of the modal, close it
window.onclick = function(event) {
if (event.target.classList.contains('modal')) {
for (var index in modals) {
if (typeof modals[index].style !== 'undefined') modals[index].style.display = "none";
}
}
}
})@import url('https://fonts.googleapis.com/css?family=Quicksand&display=swap');
/* The Modal (background) */
.modal {
box-sizing: border-box;
font-family: 'Quicksand', sans-serif;
display: none; /* Hidden by default */
position: fixed; /* Stay in place */
z-index: 1; /* Sit on top */
padding-top: 100px; /* Location of the box */
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 */
.modal-content {
color: white;
position: relative;
background-color: #171B20;
margin: auto;
padding: 0;
border: 1px solid #888;
width: 80%;
box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2),0 6px 20px 0 rgba(0,0,0,0.19);
-webkit-animation-name: animatetop;
-webkit-animation-duration: 0.4s;
animation-name: animatetop;
animation-duration: 0.4s
}
/* Add Animation */
@-webkit-keyframes animatetop {
from {top:-300px; opacity:0}
to {top:0; opacity:1}
}
@keyframes animatetop {
from {top:-300px; opacity:0}
to {top:0; opacity:1}
}
/* The Close Button */
.close {
color: #F0B823;
float: right;
font-size: 40px;
font-weight: bold;
position: absolute;
right: 20px;
top: 0;
}
.close:hover,
.close:focus {
color: #fff;
text-decoration: none;
cursor: pointer;
}
.modal-header {
padding: 2px 16px;
background-color: #171B20;
color: #F0B823;
}
.modal-body {
}
.modal-button {
font-family: 'Quicksand', sans-serif;
background-color: #171B20;
border: none;
color: white;
padding: 8px 16px;
text-align: left;
text-decoration: none;
display: inline-block;
font-size: 16px;
margin: 4px 2px;
-webkit-transition-duration: 0.4s; /* Safari */
transition-duration: 0.4s;
cursor: pointer;
width: auto;
font-size: 200%;
}
.modal-button:hover {
background-color: #171B20;
color: #F0B823;
}
.pic {
margin: auto;
display: block;
height: auto;
width: 60%;
}
.headertext {
font-family: 'Quicksand', sans-serif;
display: block;
text-align: center;
font-size: 30px;
}
.bodytext {
font-family: 'Quicksand', sans-serif;
display: block;
padding: 10px 15px;
}
@media screen and (min-width: 767px) {
.pic {
margin: auto;
display: block;
height: auto;
width: 35%;
}
}
p {
display: block;
margin: 0;
} <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<!-- Trigger/Open The Modal -->
<button class="modal-button" href="#myModal1">• Click Me</button>
<!-- The Modal -->
<div id="myModal1" class="modal">
<!-- Modal content -->
<div class="modal-content">
<div class="modal-header">
<span class="close">×</span>
<div class="headertext">
<p>Modal Header</p>
</div>
</div>
<div class="modal-body">
<img class="pic" src="https://drive.google.com/thumbnail?id=108ZLeoIfNkKODfRbLuPWpmXRl0gH9qkD">
<div class="bodytext">
<p>Body Text Comes here</p>
</div>
</div>
</div>
</div>
</div>
答案 1 :(得分：0)
尝试一下。如果图像的宽度为60％，则将绝对位置的left属性设置为20％。
.pic {
position: absolute;
left: 20%;
margin: 0 auto;
display: block;
height: auto;
width: 60%;
}