[nerv_]

bes, ES5

<form  method=get action="#" name="chekcms">
    <input type=checkbox name="wordpress">wordpress<br>
    <input type=checkbox name="ucoz">ucoz<br>
    <input type=checkbox name="dle">dle<br>
</form>

<button id="myBut">click</button>

<script>
    myBut.onclick = function () {

        alert(
            Array.prototype.slice.call( document.getElementsByTagName( 'input' ) )
                .map( function( input ) {
                    return input.checked;
                })

        );
    }
</script>