PDFObject.js、jquerymedia.js、pdf.js的对比
由于在做手机项目中需要用到预览pdf文件的需求，一搜还真多，试用后发现兼容性不是很好，大多需要浏览器对pdf阅读的支持；
如果你只是想不依赖浏览器本身对pdf解析的情况下，在手机展示pdf文件，就需要了解各个插件的优缺点进行选择；
该插件需要用到浏览器h5解析pdf的支持，在手机webview使用兼容性不是很好，下面看官方的说明：
Why use PDFObject?
PDFObject 2.0 detects browser support for inline/embedded PDFs. (In case you were wondering, your browser supports embedded PDFs. You lucky dog, you!)
If you're working with dynamic HTML, such as a single-page web app, you may need to insert PDFs on-the-fly. However, PDF embedding is not supported by certain browsers. If you insert markup without first checking for PDF support, you could wind up with missing content or a broken UI.
The PDFObject utility helps you avoid these situations by detecting support for PDF embedding in the browser; if embedding is supported, the PDF is embedded. If embedding is NOT supported by the browser, the PDF will NOT be embedded.
By default, PDFObject 2.0 inserts a fallback link to the PDF when the browser does not support inline PDFs. This ensures your users always have access to your PDF, and is designed to help you write less code. The fallback link can be customized, or the option can be disabled if you prefer.
PDFObject 2.0 is npm-ready. Modern web apps use npm to manage packages and dependencies. PDFObject 2.0 is registered with Node Package Manager (npm) and can be loaded dynamically.
PDFObject also makes it easy to specify Adobe's proprietary "PDF Open Parameters". (Be warned these parameters are only supported by Adobe Reader, most PDF readers will ignore the parameters, including the built-in PDF readers in Chrome, Internet Explorer, and Safari. Read more below.)
为什么要使用PDFObject？
PDFObject 2.0检测浏览器支持嵌入式/嵌入式PDF。 （如果你想知道，你的浏览器支持嵌入式PDF，你幸运的狗，你！）
如果您正在使用动态HTML，例如单页网络应用程序，则可能需要即时插入PDF。但是，某些浏览器不支持PDF嵌入。如果您在没有首先检查PDF支持的情况下插入标记，则可以弥补缺少的内容或损坏的UI。
通过检测对浏览器中的PDF嵌入的支持，PDFObject实用程序可以帮助您避免这些情况;如果支持嵌入，则嵌入PDF。如果浏览器不支持嵌入，则不会嵌入PDF。
默认情况下，当浏览器不支持内联PDF时，PDFObject 2.0将插入到PDF的后备链接。这确保您的用户始终可以访问您的PDF，旨在帮助您编写更少的代码。后备链接可以自定义，或者如果您愿意，可以禁用该选项。
PDFObject 2.0已经准备好了。现代网络应用程序使用npm来管理软件包和依赖项。 PDFObject 2.0已在Node Package Manager（npm）中注册，可以动态加载。
PDFObject还可以轻松地指定Adobe的专有“PDF打开参数”。 （请注意，这些参数仅由Adobe Reader支持，大多数PDF阅读器将忽略参数，包括Chrome，Internet Explorer和Safari中的内置PDF阅读器，请阅读下文。）
What PDFObject doesn't do
PDFObject is not a rendering engine. PDFObject just writes an <embed> element to the page, and relies on the browser or browser plugins to render the PDF. If the browser does not support embedded PDFs, PDFObject is not capable of forcing the browser to render the PDF.
If you need to force browsers to display a PDF, we suggest using Mozilla's PDF.js. Note that PDF.js is subject to its own limitations, such as cross-domain security restrictions. PDFObject and PDF.js play well together, there are links to some great PDF.js examples in the Examples section below.
PDFObject does not provide the ability to customize the look and feel of the PDF toolbar. The toolbar is controlled by the browser, and will vary widely from browser to browser (Chrome versus Safari versus Firefox, etc.). Some of these browsers provide the ability to show or hide the toolbar, or a feature such as the search field, via PDF Open Parmeters. However, in general the browsers do NOT provide any mechanism for customizing the toolbar. If you really need to customize the toolbar, try forking Mozilla's PDF.js and customizing it to suit your needs.
PDFObject does not validate the existence of the PDF, or that the PDF is actually rendered. The assumption is that you are specifying a valid URL and the network is functioning normally. PDFObject does not check for 404 errors, and JavaScript cannot detect whether the PDF actually renders, unless you are using PDF.js, which is outside the scope of PDFObject.
PDFObject does not magically implement PDF Open Parameters. As mentioned above, these parameters are not widely supported. The PDF rendering engine either supports them or doesn't — PDFObject cannot force the rendering engine to implement these features.
什么PDFObject不做
PDFObject不是一个渲染引擎。 PDFObject只是将一个<embed>元素写入页面，并依赖于浏览器或浏览器插件来呈现PDF。如果浏览器不支持嵌入式PDF，PDFObject不能强制浏览器呈现PDF。
如果您需要强制浏览器显示PDF，我们建议使用Mozilla的PDF.js.请注意，PDF.js有其自身的限制，如跨域安全限制。 PDFObject和PDF.js很好地协同工作，下面的例子中有一些很棒的PDF.js示例链接。
PDFObject不提供自定义PDF工具栏的外观的功能。工具栏由浏览器控制，并且从浏览器到浏览器（Chrome与Safari和Firefox等）的差异很大。其中一些浏览器提供了通过PDF打开Parmeters显示或隐藏工具栏或功能（如搜索字段）的功能。但是，一般来说，浏览器不提供自定义工具栏的任何机制。如果您真的需要自定义工具栏，请尝试针对Mozilla的PDF.js进行自定义以满足您的需求。
PDFObject不验证PDF的存在，或PDF实际呈现。假设您指定一个有效的URL，并且网络正常运行。 PDFObject不检查404错误，JavaScript无法检测PDF是否实际呈现，除非您使用的PDF.js不属于PDFObject范围。
PDFObject不会神奇地实现PDF打开参数。如上所述，这些参数不被广泛支持。 PDF渲染引擎支持它们或不支持 - PDFObject不能强制渲染引擎实现这些功能。
The jQuery Media Plugin supports unobtrusive conversion of standard markup into rich media content. It can be used to embed virtually any media type, including Flash, Quicktime, Windows Media Player, Real Player, MP3, Silverlight, PDF and more, into a web page. The plugin converts an element (usually an <a>) into a <div> which holds the object, embed or iframe tags neccessary to render the media content.
jQuery Media插件支持将标准标记转换为富媒体内容。 它可以用于将几乎任何媒体类型（包括Flash，Quicktime，Windows Media Player，Real Player，MP3，Silverlight，PDF等）嵌入到网页中。 该插件将一个元素（通常是<a>）转换成一个保存对象的<div>，需要嵌入或iframe标签才能呈现媒体内容。
3、pdf.js
重点介绍的就是这个插件，可以完全脱离浏览器的依赖，支持pdf阅读展示，真的很强大，这个才是我需要找的，且看插件说明：
- PDF.js是使用HTML5构建的便携式文档格式（PDF）查看器。
- PDF.js是由Mozilla实验室的社区驱动和支持。 我们的目标是创建一个通用的基于Web标准的平台，用于解析和渲染PDF。
不同之处在于pdf.js是web渲染pdf引擎。
