filtro tabla

<script>

    document.querySelector("#buscar").onkeyup = function(){
        $TableFilter("#tabla", this.value);
    }
    $TableFilter = function(id, value){
        var rows = document.querySelectorAll(id + ' tbody tr');

        for(var i = 0; i < rows.length; i++){
            var showRow = false;

            var row = rows[i];
            row.style.display = 'none';

            for(var x = 0; x < row.childElementCount; x++){
                if(row.children[x].textContent.toLowerCase().indexOf(value.toLowerCase().trim()) > -1){
                    showRow = true;
                    break;
                }
            }

            if(showRow){
                row.style.display = null;
            }
        }
    }
    </script>