Javascript: How do I change every word visible on screen? -

i want joke code changes every word on screen specific other word, example: "i trains" --> "hello hello hello" well, that's easy. problem select every text on screen. can me?

recursively walk nodes , regex replace. quick , dirty example:

function replaceallwords(newword) {     (var = 0; < document.childnodes.length; i++) {         checknode(document.childnodes[i]);     }     function checknode(node) {         var nodename = node.nodename.tolowercase();         if(nodename === 'script' || nodename === 'style') {return;}         if (node.nodetype === 3) {             var text = node.nodevalue;             var newtext = text.replace(/\b\w+/g, newword);             node.nodevalue = newtext;         }         if (node.childnodes.length > 0) {             (var j = 0; j < node.childnodes.length; j++) {                 checknode(node.childnodes[j]);             }         }     } }  //use replaceallwords("hello"); 

doing regex on innerhtml replace matches, including block script thats on page. function checks text node, before doing replace, replace word characters (a-za-z0-9_) 1 or more characters, not replace spaces or symbols (i.e. punctuation, $ etc stay put)