Modifying DOM of a html page from background javascript

问题

How do I modify DOM html page from background script? The html page exists in the extension's root folder. When then page is opened the URL is looked like "chrome-extension://hffffemnacblbojccelnkhnafndfkhgc/block.html"

File tree in my extension:

css/
  bootstrap-theme.css
  bootstrap-theme.css.map
  bootstrap-theme.min.css
  bootstrap.css
  bootstrap.css.map
  bootstrap.min.css
  popup.css

fonts/

img/    
  128-128.png
  1413232635_virus detected 2.png
  16-16.png
  48-48.png

js/ 
  block.js
  bootstrap.js
  bootstrap.min.js
  event.js
  jquery-1.11.1.js
  jquery.cookie.js

block.html

manifest.json

popup.html

manifest.json

{
  "manifest_version": 2,

  "name": "Viper Security ATD",
  "version": "1.0",
  "description": "Viper Security Advance Threat Defence.",
   "icons": {
    "48": "img/48-48.png",
    "128": "img/128-128.png"
  },

  "browser_action": {
    "default_icon": "img/16-16.png",
       "default_title": "Viper Security Advance Threat Defence",   
          "default_popup": "popup.html"
  },


  "background": {
    "scripts": ["js/jquery-1.11.1.js","js/event.js"],
    "persistent": true
  },

  "permissions": [
  "<all_urls>",
  "tabs",
  "webNavigation"
  ]
}

回答1:

I want Modify dom of a HTML page of my extension from background javascript. The page exists on my extension's root. the page url looking like:chrome-extension://hffffemnacblbojccelnkhnafndfkhgc/block.html

Technically, you can do that.

If the page with block.html is open, the background page can get a reference to its window object with this code:

var win = chrome.extension.getViews("tab").filter(
  function(w) {return w.location.pathname == "/block.html"}
)[0];

win.document.getElementById("foo").value("bar"); // Modify that page
win.somefunc(); // Call a global function in that page
// etc.

It is probably cleaner, however, to use Messaging and send messages from the background script that will be received by every block.html open.

Note: you can't modify the actual files, you can only modify the DOM of an opened document.

来源：https://stackoverflow.com/questions/26409377/modifying-dom-of-a-html-page-from-background-javascript