前端开发中--点击图片放大效果的实现
2021年9月28日 18:28 by wst
bootstrap最近在做网站的时候，想让用户点击缩略图时可以放大显示。自己写又麻烦，于是找了第三方的插件，实现方法如下：
下载Bootstrap-viewer库
下载地址：https://github.com/movingheart/bootstrap-viewer
大家可以用https的方式拉取，这样会更方便一些，命令如下：
git clone https://github.com/movingheart/bootstrap-viewer.git
在网页中配置库
网页内容如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<style>
.viewer{
width: auto;
height: 200px;
}
.container{
margin-top: 200px;
}
</style>
</head>
<body>
<div class="container">
<div class="row">
<img src="./images/peiqi_s.jpg" data-original="./images/peiqi_l.jpg" class="img-reponsive col-md-6 viewer"/>
<img src="./images/qiaozhi_s.jpg" data-original="./images/qiaozhi_l.jpg" class="img-reponsive col-md-6 viewer"/>
</div>
</div>
<script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.js"></script>
<script src="../dist/bootstrap.viewer.min.js"></script>
<script type="text/javascript">
$(function () {
$('.viewer').bootstrapViewer({
src: "data-original"
});//The default image source file path is the src attribute of the img tag.
})
</script>
</body>
</html>
注意点
1. 在引入外部文件的时候的顺序：css文件在head中引入，js文件的引入请按照代码中的顺序；
2. 32-38行中的作用是：
* 找class中有viewer的元素，附加上bootstrapViewer方法，即点击图片放大。
* 35行的作用时，点击时放大的图片从元素的data-original属性中取，如果不传这个参数，则src取；
后话
刚开始在网上找的都是viewer.js的用法，奈何麻烦，代码又多。
况且我用的是bootstrap框架，所以用bootstrap-viewer库啦。
但是呢，用法不全面，最后经过探索，发现可以定制显示用的属性。
于是fork了仓库，添加了例子，以方便后来人。
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