dev

<div id="hoge">HOGE</div>
<script>
document.getElementById('hoge').addEventListener('mousedown', function(event){
    switch (event.which) {
    case 1:
        console.log('!!Left');
        break;
    case 2:
        console.log('!!Middle');
        break;
    case 3:
        console.log('!!Right');
        break;
    default:
        console.log('!!No-specified');
    }
});
</script>