javascript自定义滚动条插件，几行代码的事儿

时间：2022-02-20 19:57:27

在实际项目中，经常由于浏览器自带的滚动条样式太戳，而且在各个浏览器中显示不一样，所以我们不得不去实现自定义的滚动条，今天我就用最少的代码实现了一个自定义滚动条，代码量区区只有几十行，使用起来也非常方便。

<!DOCTYPE html>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>自定义滚动条</title>

<style type="text/css">

body,ul,dl,dd{ margin:0; padding:0; font-size:12px; font-family:'微软雅黑';}

.clear{ zoom:1}

.clear:after{ display:block; content:""; clear:both}

.box{margin:28px auto; width:164px; height:440px; background:#000; padding:8px;}

#wrap{ width:170px; height:386px; background:#1c1c1d; overflow:hidden; position:relative; }

#listbox{ float:left; width:160px; position:absolute; left:0; top:0; }

#scrollbox{ float:right; width:3px; height:386px; background: #333; position:relative;}

#scrollbar{ width:3px; height:30px; background:#cc3f2e; position:absolute; left:0; top:0;}

li{ height:80px; margin-bottom:8px; list-style:none;}

.picbox,.div{ float:left;}

.picbox{ width:150px; position:relative; }

.picbox span{ position:absolute; left:0px; bottom:0px; width:90px; height:22px;}

dl{ width:139px; height:76px; color:#fff; padding:4px 0 0 10px;line-height:18px; position:absolute;left:0; top:0; opacity:0.2; filter:alpha(opacity=20); }

.div{width:149px; height:80px; position:relative; }

.mark{width:149px; height:80px; position:absolute; top:0; left:0; background:#fff; opacity:0.1; filter:alpha(opacity=10);}

.nav{ width:160px; height:35px; font-family:'微软雅黑';background:#1c1c1d; padding-top:5px;}

.a,.b{ width:152px; height:24px; line-height:24px; background:#666; text-align:center; float:left; color:#fff; cursor:pointer}

.a{margin-right:5px; display:inline; background:#333; color:#666; }

li.active .mark{opacity:0.2; filter:alpha(opacity=20);}

li.active dl{ opacity:0.7; filter:alpha(opacity=70);}

</style>

</head>

<body>

  <div class="box">

    <div class="nav">

      <div class="a">猜你喜欢</div>

    </div>

    <div id="wrap">

      <ul id="listbox">

        <li class="active">

          <div class="picbox">

            <span class="a1"></span>

          </div>

          <div class="div">

            <div class="mark"></div>

            <dl class="textbox">

              <dt>飞狐外传</dt>

              <dd>主演：方力申 周秀娜 谈莉娜 周秀娜施展媚术</dd>

              <dd>史上身材最棒狐仙</dd>

            </dl>

          </div>

        </li>

        <li>

          <div class="picbox">

            <span class="a2"></span>

          </div>

          <div class="div">

            <div class="mark"></div>

            <dl class="textbox">

              <dt>飞狐外传</dt>

              <dd>主演：方力申 周秀娜 谈莉娜 周秀娜施展媚术</dd>

              <dd>史上身材最棒狐仙</dd>

            </dl>

          </div>

        </li>

        <li>

          <div class="picbox">

            <span class="a2"></span>

          </div>

          <div class="div">

            <div class="mark"></div>

            <dl class="textbox">

              <dt>飞狐外传</dt>

              <dd>主演：方力申 周秀娜 谈莉娜 周秀娜施展媚术</dd>

              <dd>史上身材最棒狐仙</dd>

            </dl>

          </div>

        </li>

        <li>

          <div class="picbox">

            <span></span>

          </div>

          <div class="div">

            <div class="mark"></div>

            <dl class="textbox">

              <dt>飞狐外传</dt>

              <dd>主演：方力申 周秀娜 谈莉娜 周秀娜施展媚术</dd>

              <dd>史上身材最棒狐仙</dd>

            </dl>

          </div>

        </li>

        <li>

          <div class="picbox">

          </div>

          <div class="div">

            <div class="mark"></div>

            <dl class="textbox">

              <dt>飞狐外传</dt>

              <dd>主演：方力申 周秀娜 谈莉娜 周秀娜施展媚术</dd>

              <dd>史上身材最棒狐仙</dd>

            </dl>

          </div>

        </li>

        <li>

          <div class="picbox">

          </div>

          <div class="div">

            <div class="mark"></div>

            <dl class="textbox">

              <dt>飞狐外传</dt>

              <dd>主演：方力申 周秀娜 谈莉娜 周秀娜施展媚术</dd>

              <dd>史上身材最棒狐仙</dd>

            </dl>

          </div>

        </li>

        <li>

          <div class="picbox">

          </div>

          <div class="div">

            <div class="mark"></div>

            <dl class="textbox">

              <dt>飞狐外传</dt>

              <dd>主演：方力申 周秀娜 谈莉娜 周秀娜施展媚术</dd>

              <dd>史上身材最棒狐仙</dd>

            </dl>

          </div>

        </li>

        <li>

          <div class="picbox">

          </div>

          <div class="div">

            <div class="mark"></div>

            <dl class="textbox">

              <dt>飞狐外传</dt>

              <dd>主演：方力申 周秀娜 谈莉娜 周秀娜施展媚术</dd>

              <dd>史上身材最棒狐仙</dd>

            </dl>

          </div>

        </li>

        <li>

          <div class="picbox">

          </div>

          <div class="div">

            <div class="mark"></div>

            <dl class="textbox">

              <dt>飞狐外传</dt>

              <dd>主演：方力申 周秀娜 谈莉娜 周秀娜施展媚术</dd>

              <dd>史上身材最棒狐仙</dd>

            </dl>

          </div>

        </li>

        <li>

          <div class="picbox">

          </div>

          <div class="div">

            <div class="mark"></div>

            <dl class="textbox">

              <dt>飞狐外传</dt>

              <dd>主演：方力申 周秀娜 谈莉娜 周秀娜施展媚术</dd>

              <dd>史上身材最棒狐仙</dd>

            </dl>

          </div>

        </li>

        <li>

          <div class="picbox">

          </div>

          <div class="div">

            <div class="mark"></div>

            <dl class="textbox">

              <dt>飞狐外传</dt>

              <dd>主演：方力申 周秀娜 谈莉娜 周秀娜施展媚术</dd>

              <dd>史上身材最棒狐仙</dd>

            </dl>

          </div>

        </li>

      </ul>

      <div id="scrollbox">

        <div id="scrollbar"></div>

      </div>

    </div>

  </div>

</body>

<script src="tinyScroll.js"></script>

<script>

    new tinyScroll({

        wrapBox : document.getElementById('wrap'),

        wrapList : document.getElementById('listbox'),

        scrollBox :document.getElementById('scrollbox'),

        scrollBar : document.getElementById('scrollbar')

    })

</script>

</html>

然后引入滚动条插件：

/**

 * javascript自定义滚动条(滚动条高度可以动态改变)

 * @param opts

 * 调用方式

 * new tinyScroll({

        wrapBox : document.getElementById('wrap'),

        wrapList : document.getElementById('listbox'),

        scrollBox :document.getElementById('scrollbox'),

        scrollBar : document.getElementById('scrollbar')

    })

 */

function tinyScroll(opts) {

    this.wrapBox = opts.wrapBox;

    this.wrapList = opts.wrapList;

    this.scrollBox = opts.scrollBox;

    this.scrollBar = opts.scrollBar;

    this.scale = 0;

    this.height = 0;

    this.maxTop = 0;

    this.ListMaxTop = 0;

    this.top = 0;

    this.bindEvent();

}

tinyScroll.prototype = {

    constructor: tinyScroll,

    init: function() {

        this.scale = this.wrapBox.clientHeight / this.wrapList.scrollHeight;

        if (this.scale > 1) this.scale = 1;

        this.height = this.scale * this.scrollBox.scrollHeight;

        this.maxTop = this.scrollBox.scrollHeight - this.height;

        this.ListMaxTop = this.wrapBox.clientHeight - this.wrapList.scrollHeight;

        if (this.scale == 1) this.scrollBox.style.display = 'none';

        this.scrollBar.style.height = this.height + 'px';

    },

    bindEvent: function() {

        var that = this;

        var mouseScroll = function(ev) {

            ev = ev || event;

            var fx = ev.wheelDelta || ev.detail;

            var bDown = true;

            if (ev.detail) {

                bDown = fx > 0 ? true: false;

            } else {

                bDown = fx > 0 ? false: true;

            }

            if (bDown) {

                that.top += 10;

            } else {

                that.top -= 10;

            }

            that.fnScroll();

            if (ev.preventDefault) {

                ev.preventDefault();

            }

            return false;

        };

        this.init();

        this.scrollBar.onmousedown = function(ev) {

            ev = ev || event;

            var disY = ev.clientY - this.offsetTop;

            document.onmousemove = function(ev) {

                ev = ev || event;

                that.top = ev.clientY - disY;

                that.fnScroll();

            };

            document.onmouseup = function() {

                document.onmouseup = document.onmousemove = null;

            };

            return false;

        };

        this.wrapBox.onmousewheel = mouseScroll;

        if (this.wrapList.addEventListener) {

            this.wrapList.addEventListener('DOMMouseScroll', mouseScroll, false);

        }

    },

    fnScroll: function() {

        if (this.top < 0) this.top = 0;

        if (this.top > this.maxTop) this.top = this.maxTop;

        var scale = this.top / this.maxTop;

        var listTop = scale * this.ListMaxTop;

        this.scrollBar.style.top = this.top + 'px';

        this.wrapList.style.top = listTop + 'px';

    }

};

将所贴代码复制到编辑器中进行预览吧，是不是感觉特酷！

这里的滚动条样式你想设计成那样都行，给予你充分的发挥空间，是不是感觉挺爽！

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