在uni-app中使用pdf.js实现在手机上打开pdf
在uni-app中实现PDF在手机上的展示，可以借助流行的PDF.js库。uni-app是一个多端开发框架，它允许开发者编写一次代码，即可在iOS、Android、H5等多个平台运行。而PDF.js是Mozilla开发的一个开源项目，专门用于在浏览器中渲染PDF文档，支持多种平台和浏览器，对于uni-app这样的跨平台开发环境来说，是非常合适的集成选择。
我们需要在uni-app项目中引入PDF.js。通常，你可以通过以下步骤将`uni-app-pdf-master`这个压缩包解压并添加到项目中：
1. 将`uni-app-pdf-master`文件夹复制到uni-app项目的`static`目录下，这个目录通常用于存放静态资源。
2. 在需要使用PDF显示功能的页面中，引用PDF.js的相关文件。例如，你可以引入`static/uni-app-pdf-master/pdf.js`和`static/uni-app-pdf-master/pdf.worker.js`，确保它们在页面加载时可用。
接下来，我们需要实现PDF的加载和渲染。在uni-app中，可以使用Vue的生命周期钩子函数来处理：
```javascript
```
在上面的代码中，我们首先在`mounted`钩子中加载PDF文档，并初始化渲染流程。`loadDocument`方法使用PDF.js的`getDocument`方法获取PDF文档对象。然后，`renderPage`方法负责渲染每个页面。注意，`renderPage`内部使用了Promise来处理异步操作，确保页面渲染的顺序正确。
此外，你可能还需要根据需求实现翻页、缩放等交互功能。例如，可以添加监听事件来改变当前显示的页面和缩放比例：
```javascript
methods: {
...
nextPage() {
if (this.pageNumPending !== null) return
this.renderPage(this.currentPage + 1)
},
prevPage() {
if (this.currentPage <= 1) return
if (this.pageNumPending !== null) return
this.renderPage(this.currentPage - 1)
},
changeScale(scale) {
this.scale = scale
this.renderPage(this.currentPage)
},
...
}
```
为了在手机上更好地适配PDF显示，你可能需要考虑调整页面的布局和样式，以及处理不同设备的屏幕尺寸差异。可以通过uni-app的CSS单位（如`rpx`）和响应式布局来适应不同屏幕大小。
在uni-app中使用PDF.js实现手机上打开PDF，需要完成引入PDF.js库、加载PDF文档、渲染页面及处理用户交互等步骤。通过以上方法，你可以在uni-app的各个平台上提供流畅的PDF查看体验。
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