各种各样的网站在我们日常工作和学习中占据着举足轻重的地位，学习、影音娱乐、查询资料、协同办公，越来越多的任务都被迁移到浏览器
因此，网页也蕴含着很多有价值、我们能够用得到的资源
例如，数据、歌曲、影视、文本、图片；所以，这几年来爬虫这项技术也成了很多开发人员必备的技能之一
以 Python 爬虫为例，比较常用的爬虫手段是结合 Requests、正则表达式等有一定门槛的工具来完成，并且还需要对 HTML、Web 具有一定的基础
这把很多开发同学拒之门外，也让很多初学者花费很多功夫和时间来学习爬虫这些技能
其实，除了上述提到那些具有一定门槛的爬虫知识之外，有一些另辟蹊径的同学会选择 Selenium 这款 Web 应用测试工具来完成爬虫任务，它能够像真正的用户一样完成一系列的操作
Selenium已经很好用，但是，它的大多数交互还是和 Web 元素之间进行的，需要使用到 HTML id、Xpath、CSS 选择器，虽然自动化程度高了一些，但是还不算足够的容易使用。
而本文的主角Helium则是在 Selenium 的基础上封装的更加高级的 Web 自动化工具，它能够通过网页端可见的标签、名称来和 Web 进行交互，例如，
-
点击键盘按键 -
右键点击 -
悬浮 -
滚动鼠标 -
拖动文件 -
刷新 -
......
通过Helium，即便不在了解 Html、CSS 这些知识，你依然可以轻松的完成 Web 自动化程序的开发，轻松掌握爬虫技能，同时能够辅助日常重复性劳动，彻底解放你的双手
Helium
为了方便大家理解和使用，Helium 作者把一些常用方法总结了一个清单
另外，在 Python 文件列出了公共函数，使用者可以通过阅读这个 Python 文件的代码来了解有哪些函数接口可以调用
在前面 GIF 动图中给出了 Helium 与 Github 的交互过程，其中涉及了我们常用的操作，例如，
-
输入账号密码 -
点击按钮 -
跳转网页
在这里，我就不再重复这个过程，下面以 爬取网页图片链接 的例子来讲解一下 Helium 的用法，同时把 Helium 的常用操作串联起来。各位可以根据自己的需求，举一反三，来发挥 Helium 的价值。
首先，来了解一下我们个人在下载图片的过程中的具体流程。
-
打开百度搜索； -
搜索相关图片； -
跳转到图片页面； -
打开图片； -
点击下载按钮；
下面，就通过 Helium 来逐步完成上述 5 步
打开百度搜索
Helium 可以直接打开对应的网址，目前支持 Chrome 和火狐浏览器，只要用到start_chrome或者start_firefox函数，下面以 Chrome 浏览器为例，
搜索图片&跳转到图片页面
搜索图片过程中，首先需要在搜索框输出想要的目标图片，然后点击百度一下或者按下ENTER键
打开图片
在前面 Helium 与 Github 交互的示例中，我们发现，Sign in、Username 等都有标签名称。
但是，我们在这里跳转到图片页面时，发现每幅图片并没有 标签，那么我们该怎么确定点击哪一幅图呢？
好在 Helium 兼容了 Selenium 的接口，我们可以通过 Selenium 来获取页面的元素，然后结合 Helium 的点击就可以实现打开图片这一步骤
点击下载按钮
最后一步就是点击下载按钮，这一步和上一步类似，我们先通过 Selenium 的接口来获取 Web 元素，然后点击即可
到这里，就完成了整个自动化爬取图片的过程，完成代码如下，
可以看出，整条爬取图片的代码仅仅需要 10 行代码，和人为手动操作步骤一样，非常简单。
除了下载图片这项简单的任务，我们也可以利用它开发一款自动化的工具，例如文件的上传、编辑、下载影视音乐、B站视频等，可以举一反三。
如何查询指定元素名称？
在前面事例中，涉及到pn1、btn-download这 2 个 HTML 层面的内容，分别是元素名称和元素类别名称，那么，这是怎么获取的呢？
其实，非常简单，我们只需要鼠标右键点击对应按钮，然后选择 检查 即可
好了，以上就是利用 Helium 实现网页自动化的常规操作，大家也来试试吧。
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0.544px;line-height: inherit;"><pre data-darkmode-bgcolor-15882384789136="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882384789136="rgb(255, 255, 255)" data-style="letter-spacing: 0.544px; background-color: rgb(255, 255, 255); text-align: center; color: rgba(230, 230, 230, 0.9); font-size: 16px; line-height: 25.6px; overflow-wrap: break-word !important;" data-darkmode-bgcolor-15882396318564="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882396318564="rgb(255, 255, 255)" data-darkmode-color-15882396318564="rgba(230, 230, 230, 0.9)" data-darkmode-original-color-15882396318564="rgba(230, 230, 230, 0.9)" data-darkmode-bgcolor-15900529136199="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15900529136199="rgb(255, 255, 255)" data-darkmode-color-15900529136199="rgba(230, 230, 230, 0.9)" data-darkmode-original-color-15900529136199="rgba(230, 230, 230, 0.9)" class="js_darkmode__5" style="letter-spacing: 0.544px;text-align: center;color: rgba(230, 230, 230, 0.9);line-height: 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data-darkmode-bgimage-15860613985508="1" data-darkmode-bgcolor-15870356070738="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356070738="rgb(255, 255, 255)" data-darkmode-color-15870356070738="rgb(230, 230, 230)" data-darkmode-original-color-15870356070738="rgb(0, 0, 0)" data-darkmode-bgimage-15870356070738="1" data-darkmode-bgcolor-15870356071023="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356071023="rgb(255, 255, 255)" data-darkmode-color-15870356071023="rgb(230, 230, 230)" data-darkmode-original-color-15870356071023="rgb(0, 0, 0)" data-darkmode-bgimage-15870356071023="1" data-darkmode-bgcolor-15882384789136="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882384789136="rgb(255, 255, 255)" data-darkmode-color-15882384789136="rgb(230, 230, 230)" data-darkmode-original-color-15882384789136="rgb(0, 0, 0)" data-darkmode-bgimage-15882384789136="1" data-darkmode-bgcolor-15882396318564="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882396318564="rgb(255, 255, 255)" data-darkmode-color-15882396318564="rgb(230, 230, 230)" data-darkmode-original-color-15882396318564="rgb(0, 0, 0)" data-darkmode-bgimage-15882396318564="1" data-darkmode-bgcolor-15900529136199="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15900529136199="rgb(255, 255, 255)" data-darkmode-color-15900529136199="rgb(230, 230, 230)" data-darkmode-original-color-15900529136199="rgb(0, 0, 0)" data-darkmode-bgimage-15900529136199="1" style="margin-left: 2px;caret-color: rgb(255, 0, 0);width: 20px;"></section><section data-brushtype="text" data-darkmode-bgcolor-15860613985508="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15860613985508="rgb(255, 255, 255)" data-darkmode-color-15860613985508="rgb(51, 51, 51)" data-darkmode-original-color-15860613985508="rgb(51, 51, 51)" data-darkmode-bgimage-15860613985508="1" data-darkmode-bgcolor-15870356070738="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356070738="rgb(255, 255, 255)" data-darkmode-color-15870356070738="rgb(51, 51, 51)" data-darkmode-original-color-15870356070738="rgb(51, 51, 51)" data-darkmode-bgimage-15870356070738="1" data-darkmode-bgcolor-15870356071023="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356071023="rgb(255, 255, 255)" data-darkmode-color-15870356071023="rgb(51, 51, 51)" data-darkmode-original-color-15870356071023="rgb(51, 51, 51)" data-darkmode-bgimage-15870356071023="1" data-darkmode-bgcolor-15882384789136="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882384789136="rgb(255, 255, 255)" data-darkmode-color-15882384789136="rgb(51, 51, 51)" data-darkmode-original-color-15882384789136="rgb(51, 51, 51)" data-darkmode-bgimage-15882384789136="1" data-darkmode-bgcolor-15882396318564="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882396318564="rgb(255, 255, 255)" data-darkmode-color-15882396318564="rgb(51, 51, 51)" data-darkmode-original-color-15882396318564="rgb(51, 51, 51)" data-darkmode-bgimage-15882396318564="1" data-darkmode-bgcolor-15900529136199="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15900529136199="rgb(255, 255, 255)" data-darkmode-color-15900529136199="rgb(51, 51, 51)" data-darkmode-original-color-15900529136199="rgb(51, 51, 51)" data-darkmode-bgimage-15900529136199="1" style="caret-color: rgb(255, 0, 0);font-size: 14px;color: rgb(51, 51, 51);text-align: left;"><span style="font-family: 楷体, 楷体_GB2312, SimKai;font-size: 15px;">点这里，进菜鸟学PythonB站大本营</span></section></section></section></section></section></section></section>本篇文章来源于: 菜鸟学Python
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