图片 - Cacher Snippet

5/4/2018 - 9:31 PM

图片

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：

实例
// 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";
}

响应式图片相册

响应式图片相册
实例
.responsive {
    padding: 0 6px;
    float: left;
    width: 24.99999%;
}

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

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

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) 。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>W3Cschool教程(w3cschool.cn)</title> 
<style>
img {
    width: 33%;
    height: auto;
    float: left; 
    max-width: 235px;
}

.blur {-webkit-filter: blur(4px);filter: blur(4px);}高斯模糊
.brightness {-webkit-filter: brightness(250%);filter: brightness(250%);}使其看起来更亮或更暗
.contrast {-webkit-filter: contrast(180%);filter: contrast(180%);}对比度
.grayscale {-webkit-filter: grayscale(100%);filter: grayscale(100%);}转换为灰度图像
.huerotate {-webkit-filter: hue-rotate(180deg);filter: hue-rotate(180deg);}色相旋转
.invert {-webkit-filter: invert(100%);filter: invert(100%);}反转输入图像
.opacity {-webkit-filter: opacity(50%);filter: opacity(50%);}透明程度
.saturate {-webkit-filter: saturate(7); filter: saturate(7);}图像饱和度
.sepia {-webkit-filter: sepia(100%);filter: sepia(100%);}转换为深褐色
.shadow {-webkit-filter: drop-shadow(8px 8px 10px green);filter: drop-shadow(8px 8px 10px green);}
</style>
</head>
<body>

<p><strong>注意:</strong> Internet Explorer <span lang="no-bok">或 Safari 5.1 (及更早版本)</span> 不支持该属性。</p>

<img src="/statics/images/pineapple.jpg" alt="Pineapple" width="300" height="300">
<img class="blur" src="/statics/images/pineapple.jpg" alt="Pineapple" width="300" height="300">
<img class="brightness" src="/statics/images/pineapple.jpg" alt="Pineapple" width="300" height="300">
<img class="contrast" src="/statics/images/pineapple.jpg" alt="Pineapple" width="300" height="300">
<img class="grayscale" src="/statics/images/pineapple.jpg" alt="Pineapple" width="300" height="300">
<img class="huerotate" src="/statics/images/pineapple.jpg" alt="Pineapple" width="300" height="300">
<img class="invert" src="/statics/images/pineapple.jpg" alt="Pineapple" width="300" height="300">
<img class="opacity" src="/statics/images/pineapple.jpg" alt="Pineapple" width="300" height="300">
<img class="saturate" src="/statics/images/pineapple.jpg" alt="Pineapple" width="300" height="300">
<img class="sepia" src="/statics/images/pineapple.jpg" alt="Pineapple" width="300" height="300">
<img class="shadow" src="/statics/images/pineapple.jpg" alt="Pineapple" width="300" height="300">

</body>
</html>

卡片式图片

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>W3Cschool教程(w3cschool.cn)</title> 
<style>
body {margin:25px;}

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);
  margin-bottom: 25px;
}

div.container {
  text-align: center;
  padding: 10px 20px;
}
</style>
</head>
<body>

<h2>响应式卡片</h2>

<div class="polaroid">
  <img src="/statics/images/course/rock600x400.jpg" alt="Norway" style="width:100%">
  <div class="container">
    <p>The Troll's tongue in Hardanger, Norway</p>
  </div>
</div>

<div class="polaroid">
  <img src="/statics/images/course/lights600x400.jpg" alt="Norway" style="width:100%">
  <div class="container">
    <p>Northern Lights in Norway</p>
  </div>
</div>

</body>
</html>

图片文本

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>W3Cschool教程(w3cschool.cn)</title> 
<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>

<h2>图片文本</h2>
<p>在图片左上角添加文本信息:</p>

<div class="container">
  <img src="/statics/images/course/trolltunga.jpg" alt="Norway" width="1000" height="300">
  <div class="topleft">左上角</div>
</div>

</body>
</html>

响应式图片随着浏览器自动放大缩小

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>W3Cschool教程(w3cschool.cn)</title> 
<style>
img {
    max-width: 100%;
    height: auto;
}
</style>
</head>
<body>

<h2>响应式图片</h2>
<p>响应式图片会自动适配各种尺寸的屏幕。</p>
<p>通过重置浏览器大小查看效果:</p>

<img src="/statics/images/course/trolltunga.jpg" alt="Norway" width="1000" height="300">

</body>
</html>

缩略图

我们使用 border 属性来创建缩略图。

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

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




<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>W3Cschool教程(w3cschool.cn)</title> 
<style>
a {
    display: inline-block;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 5px;
    transition: 0.3s;
}

a:hover {
    box-shadow: 0 0 2px 1px rgba(0, 140, 186, 0.5);
}
</style>
</head>
<body>

<h2>缩略图作为连接</h2>
<p>我们使用 border 属性来创建缩略图。在图片外层添加一个链接。</p>
<p>点击图片查看效果：</p>

<a target="_blank" href="paris.jpg">
  <img src="/statics/images/course/paris.jpg" alt="Paris" width="400" height="300">
</a>

</body>
</html>

圆角，椭圆图片

圆角图片
实例
圆角图片:

img {
    border-radius: 8px;
}



实例
椭圆形图片:

img {
    border-radius: 50%;
}

<img> 标签

<img src="smiley-2.gif" alt="Smiley face" width="42" height="42">

热点

<img src="/statics/images/course/planets.gif" width="145" height="126" alt="Planets" usemap="#planetmap">

<map name="planetmap">

  <area shape="rect" coords="0,0,82,126" target="_blank" alt="Sun" href="/statics/images/course/sun.gif">

  <area shape="circle" coords="90,58,3" target="_blank" alt="Mercury" href="/statics/images/course/merglobe.gif">

  <area shape="circle" coords="124,58,8" target="_blank" alt="Venus" href="/statics/images/course/venglobe.gif">

</map>

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图片