I am creating a Chrome extension that should loop all words on a webpage and replace them with images. The problem is that I cannot quite get the loop through all words right. This is the code I have so far. I am running this in the content.js.

walk(document.body, /([^\s]+)/g);

function walk(node, targetRe) {
  var child;

  switch (node.nodeType) {
    case 1: // Element
      for (child = node.firstChild;
           child;
           child = child.nextSibling) {
        walk(child, targetRe);
      }
      break;
    case 3: // Text node
      handleText(node, targetRe);
      break;
  }
}

function handleText(node, targetRe) {
  var match, targetNode, followingNode, wrapper;

  // Does the text contain our target string?
  // (This would be a regex test in your http://... case)
  match = targetRe.exec(node.nodeValue);

  if (match) {
    // Split at the beginning of the match
    targetNode = node.splitText(match.index);

    // Split at the end of the match.
    // match[0] is the full text that was matched.
    followingNode = targetNode.splitText(match[0].length);
    console.log(followingNode)

    // Wrap the target in an `a` element.
    // First we create the wrapper and insert it in front
    // of the target text. We use the first capture group
    // as the `href`.
    wrapper = document.createElement('img');
    wrapper.style.backgroundColor = "yellow"
    wrapper.src = "fasd";//suche match
    targetNode.parentNode.insertBefore(wrapper, targetNode);

    // Now we move the target text inside it
    wrapper.appendChild(targetNode);

    // Clean up any empty nodes (in case the target text
    // was at the beginning or end of a text ndoe)
    if (node.nodeValue.length == 0) {
      node.parentNode.removeChild(node);
    }
    if (followingNode.nodeValue.length == 0) {
      followingNode.parentNode.removeChild(followingNode);
    }

    // Continue with the next match in the node, if any
    match = followingNode
      ? targetRe.exec(followingNode.nodeValue)
      : null;
  }
}

But it sometimes only matches the first word in a sentence and also gives back a lot of junk, like code. How can I filter that out?

Thanks for your help