prevent jQuery evnet

<input type="text" id="target"></textarea>

<input id="remove" type="button" value="remove" />

<p id="status"></p>

<script src="//code.jquery.com/jquery-1.11.0.min.js"></script>

<script>

var handler = function(e){

$('#status').text(e.type+Math.random());

};

$('#target').on('focus blur', handler)

$('#remove').on('click' , function(e){

$('#target').off('focus blur', handler);

console.log(32);

})

</script>