效果如下:

今天写了这个效果的代码
用在主页的diary里
觉得以前用scroll对象来控制文本框，滚动起来比较生硬

其中drag为滚动条名字
block为文本框
b_up,b_down为上下滚动按钮

主要方法是用block始终跟随drag的位置变化而滚动
而b_up,b_down还有鼠标滚轮都是直接控制drag的位置变化的，从而间接控制文本框的滚动

            // JTL
            // http://www.hartech.cn
            // e-mail: jtl.zheng@gmail.com            //初始化函数            function Var() {            //滚动条与上下按钮的间隙            space = 31;            //上下按钮的滚动速度            updown_speed = 5;            //文本框的滚动范围            block_range = block._height-mark._height;            //文本框的初始位置            block_origin = block._y;            //滚动条的滚动范围            drag_range = b_down._y-b_up._y-2*space;            //滚动条的初始位置            drag_origin = b_up._y+space;            //初始化滚动条位置            drag._y = drag_origin;            //滚动缓冲系数            k = .1;            }           Var();           //block为文本框，始终跟随滚动条（drag）变化            block.onEnterFrame = function() {            //pos为文本框目标位置            pos = block_origin-(drag._y-drag_origin)*block_range/drag_range;            //缓冲效果            this._y += (pos-this._y)*k;            };           drag.onPress = function() {            this.startDrag(false, this._x, drag_origin, this._x, (drag_origin+drag_range));            };           drag.onRelease = function() {            this.stopDrag();            };           //up_down按钮            b_up.onPress = function() {            onEnterFrame = function () {            if (drag._y<=drag_origin) {            drag._y = drag_origin;            } else {            drag._y -= updown_speed;            }            };            };            b_up.onRelease = function() {            onEnterFrame = null;            };            b_down.onPress = function() {            onEnterFrame = function () {            if (drag._y>=drag_origin+drag_range) {            drag._y = drag_origin+drag_range;            } else {            drag._y += updown_speed;            }            };            };            b_down.onRelease = function() {            onEnterFrame = null;            };            //侦听mouse滚轮            mouseListener = new Object();            mouseListener.onMouseWheel = function(delta) {            if (delta>0) {            drag._y -= updown_speed*2;            }            if (delta<0) {            drag._y += updown_speed*2;            }            if (drag._y<=drag_origin) {            drag._y = drag_origin;            }            if (drag._y>=drag_origin+drag_range) {            drag._y = drag_origin+drag_range;            }            };            Mouse.addListener(mouseListener);           

建立文本框代码

   loadVariables("text/diary.txt", this);   myTextFormat = new TextFormat();   myTextFormat.font = "宋体";   myTextFormat.size = 12;   myTextFormat.leading = 3;   createTextField("test_txt", 10, 0, 0, 210, 10);   test_txt.multiline = true;   test_txt.wordWrap = true;   test_txt.autoSize = true;   test_txt.html = true;   test_txt.htmlText = text;   test_txt.setTextFormat(myTextFormat);   test_txt.type = "Static";   // 演示地址：   // http://www.hartech.cn/blog/blogview.asp?logID=45