div框，左右拖动

<script type="text/javascript">
    function bindResize(el){
        //初始化参数
        var els = document.getElementById('admin-offcanvas').style;
        //鼠标的 X 和 Y 轴坐标
        var x = 0;
        //邪恶的食指
        $(el).mousedown(function (e){
            //按下元素后，计算当前鼠标与对象计算后的坐标
            x = e.clientX - el.offsetWidth - $("#admin-offcanvas").width();
            //在支持 setCapture 做些东东, //捕捉焦点,//设置事件
            el.setCapture ? (el.setCapture(),el.onmousemove = function (ev){
                mouseMove(ev || event);},el.onmouseup = mouseUp) : (
                //绑定事件
                $(document).bind("mousemove", mouseMove).bind("mouseup", mouseUp));
            //防止默认事件发生
            e.preventDefault();
        });
        //移动事件 运算中...
        function mouseMove(e){
            els.width = e.clientX - x + 'px';
            var left = e.clientX - x + 'px';
            $("#rightbar").attr("style","width: 5px;height: 100%;background: #cecece; z-index:999;cursor:e-resize;left: "+left+";position: absolute;");
            $("#admin_content").attr("style","position: absolute;left: "+left+";top: 0;right: 0;bottom: 0;");
        }
        //停止事件
        function mouseUp(){
            //在支持 releaseCapture 做些东东, //释放焦点, //移除事件
            el.releaseCapture ? (el.releaseCapture(),el.onmousemove = el.onmouseup = null) : (
                //卸载事件
                $(document).unbind("mousemove", mouseMove).unbind("mouseup", mouseUp));
        }
    }
    var divResize=function(){
        var totalHeight=$("html").height();
        // console.log(totalHeight);
        var topHeight=$("#top").height();
        $("#admin-offcanvas").height(totalHeight-topHeight);
        $("#rightbar").height(totalHeight-topHeight);
    };
    $(function() {
        divResize();
        $(window).resize(divResize);
        bindResize(document.getElementById('rightbar'));
    });
</script>

            <%--div 1--%>
            <div class="admin-sidebar am-offcanvas" id="admin-offcanvas" style="position: absolute;left: 0;top: 0;width: 20%;bottom: 0px;">
            内容div 1
            </div>
            <%--移动边框--%>
            <div id="rightbar" style="width: 5px;height: 100%;background: #cecece; cursor: e-resize;z-index:999;left: 330px;position: absolute;"></div>
            <%--div 2--%>
            <div class="admin-content" id="admin_content" style="position: absolute;left: 20%;top: 0;right: 0;bottom: 0;">
            内容div 2
            </div>