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上下箭頭切換開關

get html cnblogs arr down attr script pre ()

<body>
<div class="arr">
    <img src="arr-down.png" >
</div>
<script src="js/jquery.js"></script>
<script>
    var $arr = $(‘.arr‘);
    var target = false;
    $arr.click(function () {
        target = !target;
        if (target) {
            $arr.find(‘img‘).attr(‘src‘, ‘arr-up.png‘);
        } else {
            $arr.find(‘img‘).attr(‘src‘, ‘arr-down.png‘);
        }
    });
</script>
</body>

  

上下箭頭切換開關