♫【jQuery】detach

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title></title>
</head>
<body>
    <div id="box1">box1</div>
    <button id="btn1">btn1</button>
    <div id="box2">box2</div>
    <button id="btn2">btn2</button>
    <script src="http://upcdn.b0.upaiyun.com/libs/jquery/jquery-2.0.3.min.js"></script>
    <script>
        $('#box1').click(function() {
            console.log('box1')
        })
        $('#box2').click(function() {
            console.log('box2')
        })
        $('#box1').data('key1', 'value1')
        $('#box2').data('key2', 'value2')
        var $box1
        var $box2
        $('#btn1').click(function() {
            console.log($('#box1').data('key1'))
            if ($box1) {
                $('#btn1').before($box1)
                $box1 = null
            } else {
                $box1 = $('#box1').detach()
            }
        })
        $('#btn2').click(function() {
            console.log($('#box2').data('key2'))
            if ($box2) {
                $('#btn2').before($box2)
                $box2 = null
            } else {
                $box2 = $('#box2').remove()
            }
        })
    </script>
</body>
</html>