JS 鼠标放上去滑出内容案例

.sliderbar {
            width: 200px;
            height: 40px;
            position: relative;
            margin: 0 auto;
        }

        .sliderbar span {
            display: inline-block;
            width: 50px;
            text-align: center;
            line-height: 40px;
            background-color: pink;
        }

        .con {
            display: inline-block;
            position: absolute;
            width: 150px;
            text-align: center;
            line-height: 40px;
            background-color: pink;
        }

<div class="sliderbar">
        <span>←</span>
        <div class="con">问题反馈</div>
    </div>

var sliderbar = document.querySelector('.sliderbar')
        var con = document.querySelector('.con')
        sliderbar.addEventListener('mouseenter', function () {
            animate(con, -150, function () {
                // 当动画执行完毕,就把箭头方向交换
                sliderbar.children[0].innerHTML = '→'
            })
        })
        sliderbar.addEventListener('mouseleave', function () {
            animate(con, 50, function () {
                sliderbar.children[0].innerHTML = '←'
            })
        })

还需要引入一个文件

function animate(obj, target, callback) {
    clearInterval(obj.timer)
    obj.timer = setInterval(function () {
        // 把移动值改为整数避免存在小数
        var step = (target - obj.offsetLeft) / 10;
        step = step > 0 ? Math.ceil(step) : Math.floor(step);
        if (obj.offsetLeft == target) {
            clearInterval(obj.timer)
            // 回调函数写在定时器结束后面
            // if (callback) {
            //     callback();
            // }
            callback && callback();
        }
        // 把里面的移动值改为慢慢变小的值
        obj.style.left = obj.offsetLeft + step + 'px'
    }, 15)
}