如何通过web组件预览PDF

"requestPermissions":[ 
  { 
    "name" : "ohos.permission.INTERNET" 
  } 
],

import web_webview from '@ohos.web.webview'; 
 
@Entry 
@Component 
struct Index { 
  aboutToAppear() { 
    web_webview.WebviewController.setWebDebuggingAccess(true); 
  } 
  //配置Web开启调试模式 
  webController: web_webview.WebviewController = new web_webview.WebviewController(); 
 
  build() { 
    Column() { 
      // Web component loading H5. 
      Web({ src: $rawfile('index.html'), controller: this.webController }) 
    } 
  } 
}