$(function() {

    // 公告滚动

    $(".notice-content").textScroll();

});

/**

 * 从右往左滚动文字

 * @returns {undefined}

 */

$.fn.textScroll = function() {

    // 滚动步长(步长越大速度越快)

    var step_len = 60;

    var this_obj = $(this);

    var child = this_obj.children();

    var this_width = this_obj.width();

    var child_width = child.width();

    var continue_speed = undefined;// 暂停后恢复动画速度

    // 初始文字位置

    child.css({

        left: this_width

    });

    // 初始动画速度speed

    var init_speed = (child_width + this_width) / step_len * 1000;

    // 滚动动画

    function scroll_run(continue_speed) {

        var speed = (continue_speed == undefined ? init_speed : continue_speed);

        child.animate({

            left: -child_width

        }, speed, "linear", function() {

            $(this).css({

                left: this_width

            });

            scroll_run();

        });

    }

    // 鼠标动作

    child.on({

        mouseenter: function() {

            var current_left = $(this).position().left;

            $(this).stop();

            continue_speed = (-(-child_width - current_left) / step_len) * 1000;

        },

        mouseleave: function() {

            scroll_run(continue_speed);

            continue_speed = undefined;

        }

    });

    // 启动滚动

    scroll_run();

};

                <div class="notice-title">公告：</div>

                <div class="notice-content">

                    <div class="notice-text"><span>公告内容</span></div>

                </div>

.notice-title {

            color: #fff;

        }

        .notice-content {

            position: relative;

            width: 800px;

            height: 30px;

            white-space: nowrap;

            overflow: hidden;

            float: left;

            margin-left: 55px;

            margin-top: -30px;

            /*背景透明度

            background-color: #fff;

            filter:alpha(opacity=10);

            -moz-opacity:0.5;

            -khtml-opacity: 0.5;

            opacity: 0.5;

            */

        }

        .notice-text {

            color: red;

            font-size: 14px;

            position: absolute;

        }