Chrome 替换网页文本的扩展有时只有在手动刷新网页后才能工作

Question

我正在开发 chrome 扩展来替换网页上的特定文本。对于某些网站，它只有在使用 F5 手动刷新网页后才有效。例如，当我打开http://www.iciba.com/并输入Google并回车时，所有Google文本在结果没有被替换。但是我按F5手动刷新页面后，所有的文字都被替换了。

manifest.json:

{
    "name": "My Extension",
    "version": "0.1.0",
    "description": "An extension that replaces texts on webpages",
    "manifest_version": 2,
    "permissions": [
        "tabs",
        "<all_urls>"
    ],
    "content_scripts": [{
        "matches": [
            "http://*/*",
            "https://*/*"
        ],
        "js": [
            "replacetxt.js"
        ],
        "run_at": "document_end",
        "all_frames": true
    }]
}

replacetxt.js:

function isExcluded(elm) {
  if (elm.tagName == "STYLE") {
    return true;
  }
  if (elm.tagName == "SCRIPT") {
    return true;
  }
  if (elm.tagName == "NOSCRIPT") {
    return true;
  }
  if (elm.tagName == "IFRAME") {
    return true;
  }
  if (elm.tagName == "OBJECT") {
    return true;
  }
  return false
}

function traverse(elm) {
  if (elm.nodeType == Node.ELEMENT_NODE || elm.nodeType == Node.DOCUMENT_NODE) {

    // exclude elements with invisible text nodes
    if (isExcluded(elm)) {
      return
    }

    for (var i=0; i < elm.childNodes.length; i++) {
      // recursively call to traverse
      traverse(elm.childNodes[i]);
    }

  }

  if (elm.nodeType == Node.TEXT_NODE) {

    // exclude text node consisting of only spaces
    if (elm.nodeValue.trim() == "") {
      return
    }

    // elm.nodeValue here is visible text we need.
    console.log(elm.nodeValue);
    elm.nodeValue = elm.nodeValue.replace("Google", "***");
  }
}

traverse(document);

这是遵循@wOxxOm 的建议的工作代码

// Options for the observer (which mutations to observe)
const config = { attributes: true, childList: true, subtree: true };

// Callback function to execute when mutations are observed
const callback = function(mutationsList, observer) {
    // Use traditional 'for loops' for IE 11
    for(const mutation of mutationsList) {
        traverse(mutation.target);
    }
};

// Create an observer instance linked to the callback function
const observer = new MutationObserver(callback);

// Start observing the target node for configured mutations
observer.observe(document, config);

Answer 1

// Options for the observer (which mutations to observe)
const config = { attributes: true, childList: true, subtree: true };

// Callback function to execute when mutations are observed
const callback = function(mutationsList, observer) {
    // Use traditional 'for loops' for IE 11
    for(const mutation of mutationsList) {
        traverse(mutation.target);
    }
};

// Create an observer instance linked to the callback function
const observer = new MutationObserver(callback);

// Start observing the target node for configured mutations
observer.observe(document, config);

Chrome 替换网页文本的扩展有时只有在手动刷新网页后才能工作

Chrome extension to replace text on webpage works only after manually refreshing webpage sometimes

javascript

google-chrome-extension