//Crockfordian walk the dom
var walkTheDOM = function walk(node, func) {
    func(node);
    node = node.firstChild;
    while (node) {
        walk(node, func);
        node = node.nextSibling;
    }
};
var getTextNodes = function(node,func){
    walkTheDOM(document.body,function(node){
        if(node.nodeType==3){
            func(node);
        }
    });
};
getTextNodes(document.body,function(node){
    console.log(node.nodeValue);
});