Get frequency of words on a webpage.

wordFrequency.js

//todos: 1) moar than just <p>s, just words. 2)strip out &amp;s and stuff 3)Order by top use
//via: https://www.squarefree.com/bookmarklets/seo.html
javascript:(function(){
var T={},W=[],C=0,s,i;
function F(n){
  var i,x,a,w,t=n.tagName;
  if(n.nodeType==3){
    a=n.data.toLowerCase().split(/[\s\(\)\:\,\.;\<\>\&\'\"]/);
    for(i in a)if(w=a[i]){
      w=" "+w;T[w]=T[w]?T[w]+1:1;++C;}
    }
    if(t!="SCRIPT"&&t!="STYLE")
      for(i=0;x=n.childNodes[i];++i)F(x)}F(document);
      for(i in T)W.push([T[i],i]);
    W.sort(function(a,b){var x=b[0]-a[0];return x?x:((b[1]<a[1])?1:-1)});
    s="<h3>"+C+" words</h3>";
    for(i in W)s+=W[i][0]+":"+W[i][1]+"<br>";
    with(open().document){
      write(s);
      close();
    }
})()

//via: http://stackoverflow.com/questions/4367986/how-to-get-all-textnodes-in-html-document-from-specific-tags-using-javascript
//solving number 1:
function getTextNodes(root, tagNamesArray) {
    var textNodes = [];
    var regex = new RegExp("^(" + tagNamesArray.join("|") + ")$", "i");
    var insideMatchingElement = false;

    function getNodes(node, insideMatchingElement) {
        if (node.nodeType == 3 && insideMatchingElement) {
            textNodes.push(node);
        } else if (node.nodeType == 1) {
            var childrenInsideMatchingElement = insideMatchingElement || regex.test(node.nodeName);
            for (var child = node.firstChild; child; child = child.nextSibling) {
                getNodes(child, childrenInsideMatchingElement);
            }
        }
    }

    getNodes(root);
    return textNodes;
}

var textNodes = getTextNodes(document.body, ["blockquote","em","h4","h6","p"]);

//via: http://oreilly.com/javascript/excerpts/javascript-good-parts/awful-parts.html#object
//and: http://stackoverflow.com/questions/3479776/help-me-write-a-bookmarklete-that-counts-word-frequency
function countWordFrequency(){
pars = document.getElementsByTagName('p');
var texts ='';
for(var i=0; i< pars.length; i++){texts = texts + pars[i].innerHTML;}

var words = texts.toLowerCase(  ).split(/[\s,.]+/);

var freq = {};
len = words.length;

for (var i=0; i<len; i++) {
      // if (freq[words[i]]) { bug if one of the words is "constructor"!
      if (typeof freq[words[i]] === 'number') {
        freq[words[i]] += 1;
      } else  {
        freq[words[i]] = 1;
      }
    }
return freq;
}