为什么当我在网页上使用全屏时，图像也会缩放

Question

当我为学校项目制作网站时，我遇到了这个问题:当我使用全屏时，网站中的照片也会变大。

非全屏时:not fullscreen

全屏时:fullscreen

这是我的代码:https://github.com/Pckpow/submission-webdes

Answer 1

您需要将background-size属性更改为auto

当你使用background-size:cover时，这意味着

调整背景图像的大小以覆盖整个容器，即使它必须拉伸图像或从其中一个边缘剪切一点点

参考背景尺寸属性以获得更多说明

https://www.w3schools.com/cssref/css3_pr_background-size.asp

Answer 2

模态图像

模态是显示在当前页面顶部的对话框/弹出窗口。

这个例子使用了上一个例子中的大部分代码，模态框，只是在这个例子中，我们使用了图像。

// Get the modal
var modal = document.getElementById("myModal");
// Get the image and insert it inside the modal - use its "alt" text as a caption
var img = document.getElementById("myImg");
var modalImg = document.getElementById("img01");
var captionText = document.getElementById("caption");
img.onclick = function(){
modal.style.display = "block";
modalImg.src = this.src;
captionText.innerHTML = this.alt;
}
// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];
// When the user clicks on <span> (x), close the modal
span.onclick = function() { 
modal.style.display = "none";
}

#myImg {
border-radius: 5px;
cursor: pointer;
transition: 0.3s;
}
#myImg:hover {opacity: 0.7;}
/* The Modal (background) */
.modal {
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(0,0,0,0.9); /* Black w/ opacity */
}
/* Modal Content (image) */
.modal-content {
margin: auto;
display: block;
width: 80%;
max-width: 700px;
}
/* Caption of Modal Image */
#caption {
margin: auto;
display: block;
width: 80%;
max-width: 700px;
text-align: center;
color: #ccc;
padding: 10px 0;
height: 150px;
}
/* Add Animation */
.modal-content, #caption {  
-webkit-animation-name: zoom;
-webkit-animation-duration: 0.6s;
animation-name: zoom;
animation-duration: 0.6s;
}
@-webkit-keyframes zoom {
from {-webkit-transform:scale(0)} 
to {-webkit-transform:scale(1)}
}
@keyframes zoom {
from {transform:scale(0)} 
to {transform:scale(1)}
}
/* The Close Button */
.close {
position: absolute;
top: 15px;
right: 35px;
color: #f1f1f1;
font-size: 40px;
font-weight: bold;
transition: 0.3s;
}
.close:hover,
.close:focus {
color: #bbb;
text-decoration: none;
cursor: pointer;
}
/* 100% Image Width on Smaller Screens */
@media only screen and (max-width: 700px){
.modal-content {
width: 100%;
}
}

<img id="myImg" src="https://www.w3schools.com/howto/img_snow.jpg" alt="Snow" style="width:100%;max-width:300px">
<!-- The Modal -->
<div id="myModal" class="modal">
<span class="close">&times;</span>
<img class="modal-content" id="img01">
<div id="caption"></div>
</div>