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javascript自定义滚动条插件.
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="http://www.mamicode.com/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‘; }};
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