JQuery实现全选反选复选框

<div class="controls">
    <span><input type="checkbox" class="checkAll" /> <b>Check All</b> <span> or
    <span><a href="javascript:void(0);" class="invertSelection">Invert Selection</a></span>
</div>
<div class="elements">
    <span><input type="checkbox" class="cb-element" /> Checkbox 1</span>
    <span><input type="checkbox" class="cb-element" /> Checkbox 2</span>
    <span><input type="checkbox" class="cb-element" /> Checkbox 3</span>
    <span><input type="checkbox" class="cb-element" /> Checkbox 4</span>
</div>

<script type="text/javascript" src="http://code.jquery.com/jquery-latest.pack.js" language="javascript"></script>
    <script type="text/javascript" language="javascript">
        $( function() {
            $( '.checkAll' ).live( 'change', function() {
                $( '.cb-element' ).attr( 'checked', $( this ).is( ':checked' ) ? 'checked' : '' );
                $( this ).next().text( $( this ).is( ':checked' ) ? 'Uncheck All' : 'Check All' );
            });
            $( '.invertSelection' ).live( 'click', function() {
                $( '.cb-element' ).each( function() {
                    $( this ).attr( 'checked', $( this ).is( ':checked' ) ? '' : 'checked' );
                }).trigger( 'change' );
            });
            $( '.cb-element' ).live( 'change', function() {
                $( '.cb-element' ).length == $( '.cb-element:checked' ).length ? $( '.checkAll' ).attr( 'checked', 'checked' ).next().text( 'Uncheck All' ) : $( '.checkAll' ).attr('checked', '' ).next().text( 'Check All' );
            });
        });
    </script>