TinyMCE Keyup Function

// get tinymce instance of wp default editor
var ed = tinyMCE.getInstanceById('content');

// add a callback to tinyMCE.onKeyUp event
ed.onKeyUp.add(function(){
    // format: text will strip html tags
    console.log( ed.getContent({ format: 'text' }) ).length;
})

http://www.tinymce.com/wiki.php/api3:event.tinymce.editor.onkeyup

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