CSS 图片

一、圆角图片

img {
    border-radius: 8px;
}

二、缩略图

border 属性来创建缩略图。

img {
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 5px;
}

<img src="paris.jpg" alt="Paris">

三、响应式图片

响应式图片会自动适配各种尺寸的屏幕。

如果你需要自由缩放图片，且图片放大的尺寸不大于其原始的最大值，则可使用以下代码：

img {
    max-width: 100%;
    height: auto;
}

四、图片文本

（1）左上角：

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
.container {
    position: relative;
}
.topleft {
    position: absolute;
    top: 8px;
    left: 16px;
    font-size: 18px;
}

img { 
    width: 100%;
    height: auto;
    opacity: 0.3;
}
</style>
</head>
<body>
<div class="container">
  <img src="http://www.runoob.com/wp-content/uploads/2016/04/trolltunga.jpg" alt="Norway" width="1000" height="300">
  <div class="topleft">左上角</div>
</div>
</body>
</html>

效果：

（2）右上角：

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<style>
.container {
    position: relative;
}
.topright {
    position: absolute;
    top: 8px;
    right: 16px;
    font-size: 18px;
}
img { 
    width: 100%;
    height: auto;
    opacity: 0.3;
}
</style>
</head>
<body>
<div class="container">
  <img src="http://www.runoob.com/wp-content/uploads/2016/04/trolltunga.jpg" alt="Norway" width="1000" height="300">
  <div class="topright">右上角</div>
</div>
</body>
</html>

效果：

（3）左下角：

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<style>
.container {
    position: relative;
}
.bottomleft {
    position: absolute;
    bottom: 8px;
    left: 16px;
    font-size: 18px;
}
img { 
    width: 100%;
    height: auto;
    opacity: 0.3;
}
</style>
</head>
<body>
<div class="container">
  <img src="http://www.runoob.com/wp-content/uploads/2016/04/trolltunga.jpg" alt="Norway" width="1000" height="300">
  <div class="bottomleft">左下角</div>
</div>
</body>
</html>

效果：

（4）右下角：

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<style>
.container {
    position: relative;
}
.bottomright {
    position: absolute;
    bottom: 8px;
    right: 16px;
    font-size: 18px;
}
img { 
    width: 100%;
    height: auto;
    opacity: 0.3;
}
</style>
</head>
<body>
<div class="container">
  <img src="http://www.runoob.com/wp-content/uploads/2016/04/trolltunga.jpg" alt="Norway" width="1000" height="300">
  <div class="bottomright">右下角</div>
</div>
</body>
</html>

效果：

（5）居中：

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<style>
.container {
    position: relative;
}
.center {
    position: absolute;
    left: 0;
    top: 50%;
    width: 100%;
    text-align: center;
    font-size: 18px;
    margin-top:-9px;
}
img { 
    width: 100%;
    height: auto;
    opacity: 0.3;
}
</style>
</head>
<body>
<div class="container">
  <img src="http://www.runoob.com/wp-content/uploads/2016/04/trolltunga.jpg" alt="Norway" width="1000" height="300">
  <div class="center">居中</div>
</div>
</body>
</html>

效果：

五、卡片式图片

div.polaroid {
    width: 80%;
    background-color: white;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}

img {width: 100%}

div.container {
    text-align: center;
    padding: 10px 20px;
}

效果：

六、图片滤镜

CSS filter 属性用为元素添加可视效果 (例如：模糊与饱和度) 。

注意: Internet Explorer 或 Safari 5.1 (及更早版本) 不支持该属性。

/*修改所有图片的颜色为黑白 (100% 灰度)*/
img {
    -webkit-filter: grayscale(100%); /* Chrome, Safari, Opera */
    filter: grayscale(100%);
}

注意: Internet Explorer 或 Safari 5.1 (及更早版本) 不支持该属性。

七、响应式图片相册

.responsive {
    padding: 0 6px;
    float: left;
    width: 24.99999%;
}

@media only screen and (max- 700px){
    .responsive {
        width: 49.99999%;
        margin: 6px 0;
    }
}

@media only screen and (max- 500px){
    .responsive {
        width: 100%;
    }
}

效果：

八、图片 Modal(模态)

本实例演示了如何结合 CSS 和 JavaScript 来一起渲染图片。

首先，我们使用 CSS 来创建 modal 窗口 (对话框), 默认是隐藏的。

然后，我们使用 JavaScript 来显示模态窗口，当我们点击图片时，图片会在弹出的窗口中显示：

// 获取模态窗口
var modal = document.getElementById('myModal');

// 获取图片模态框，alt 属性作为图片弹出中文本描述
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;
    modalImg.alt = this.alt;
    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";
}

九、示例

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>CSS教程</title> 
<style>
#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(0.1)} 
    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- 700px){
    .modal-content {
        width: 100%;
    }
}
</style>
</head>
<body>

<h2>图片模态框</h2>
<p>本实例演示了如何结合 CSS 和 JavaScript 来一起渲染图片。</p><p>
首先，我们使用 CSS 来创建 modal 窗口 (对话框), 默认是隐藏的。<p>
<p>然后，我们使用 JavaScript 来显示模态窗口，当我们点击图片时，图片会在弹出的窗口中显示：</p>
<img id="myImg" src="http://www.runoob.com/wp-content/uploads/2016/04/img_lights.jpg" alt="Northern Lights, Norway" width="300" height="200">

<!-- The Modal -->
<div id="myModal" class="modal">
  <span class="close">×</span>
  <img class="modal-content" id="img01">
  <div id="caption"></div>
</div>

<script>
// 获取模态窗口
var modal = document.getElementById('myModal');

// 获取图片模态框，alt 属性作为图片弹出中文本描述
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;
    modalImg.alt = this.alt;
    captionText.innerHTML = this.alt;
}

// 获取 <span> 元素，设置关闭模态框按钮
var span = document.getElementsByClassName("close")[0];

// 点击 <span> 元素上的 (x), 关闭模态框
span.onclick = function() { 
    modal.style.display = "none";
}
</script>

</body>
</html>

效果：