Fixed menu bar sliding around

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .bar {
            width: 40px;
            height: 40px;
            position: fixed;
            top: 10px;
            right: 0;
            text-align: center;
            line-height: 40px;
            cursor: pointer;
            color: #fff;
        }
        
        .con {
            position: absolute;
            top: 0;
            left: 0;
            background: darkcyan;
            width: 200px;
            height: 40px;
            z-index: -1;
        }
    </style>
    <script src="animate.js"></script>
</head>

<body>
    <div class="bar">
        <span>←</span>
        <div class="con">意见反馈</div>
    </div>
    <script>
        var bar = document.querySelector('.bar');
        var con = document.querySelector('.con');
        var span = document.querySelector('span');

        bar.addEventListener('mouseenter',
            animate (conefunction() {-160);
        });
        bar.addEventListener('mouseleave', function() {
            animate(con, 0);
        });

        function animate(obj, target) {
            clearInterval(obj.timer);
            obj.timer = setInterval(function() {
                var step = (target - obj.offsetLeft) / 10;
                step = step > 0 ? Math.ceil(step) : Math.floor(step);
                if (con.offsetLeft == target) {
                    clearInterval(obj.timer);
                    span.innerHTML = '←';
                }
                obj.style.left = obj.offsetLeft + step + 'px';
            }, 30);
        }
    </script>
</body>

</html>
Fixed menu bar sliding around

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