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JavaScript 打造导航菜单颜色渐变效果

来源：程序员人生发布时间：2014-03-13 10:40:45 阅读次数：3294次

　　网(LieHuo.Net)教程 JavaScript 打造导航菜单颜色渐变效果，文字或背景颜色渐变，利用javascript+CSS实现的，代码内有详细注释，本文由网转载自cloudgamer的博客，请看下面的代码及效果演示：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>Javascript 颜色渐变效果</title><script type="text/javascript">var $ = function (id) { return "string" == typeof id ? document.getElementById(id) : id;};var Class = { create: function() { return function() { this.initialize.apply(this, arguments); } }}Object.extend = function(destination, source) { for (var property in source) { destination[property] = source[property]; } return destination;}function addEventHandler(oTarget, sEventType, fnHandler) { if (oTarget.addEventListener) { oTarget.addEventListener(sEventType, fnHandler, false); } else if (oTarget.attachEvent) { oTarget.attachEvent("on" + sEventType, fnHandler); } else { oTarget["on" + sEventType] = fnHandler; }};var ColorFade = Class.create();ColorFade.prototype = { initialize: function(Obj, options) { this._obj = $(Obj); this._timer = null; this.SetOptions(options); this.Step = Math.abs(this.options.Step); this.Speed = Math.abs(this.options.Speed); this.StartColor = this._color = this.GetColors(this.options.StartColor); this.EndColor = this.GetColors(this.options.EndColor); this._arrStep = [this.GetStep(this.StartColor[0], this.EndColor[0]), this.GetStep(this.StartColor[1], this.EndColor[1]), this.GetStep(this.StartColor[2], this.EndColor[2])]; this._set = !this.options.Background ? function(color){ this._obj.style.color = color; } : function(color){ this._obj.style.backgroundColor = color; }; this._set(this.options.StartColor); var oThis = this; addEventHandler(this._obj, "mouseover", function(){ oThis.Fade(oThis.EndColor); }); addEventHandler(this._obj, "mouseout", function(){ oThis.Fade(oThis.StartColor); }); }, //设置默认属性 SetOptions: function(options) { this.options = {//默认值 StartColor: "#000",//定义原来的颜色 EndColor: "#DDC",//定义要渐变的颜色 Background: false,//是否背景变色(默认文字) Step: 20,//渐变级数 Speed: 10//渐变速度 }; Object.extend(this.options, options || {}); }, //获取颜色数据 GetColors: function(sColor) { sColor = sColor.replace("#", ""); var r, g, b; if (sColor.length > 3) { r = Mid(sColor, 0, 2); g = Mid(sColor, 2, 2); b = Mid(sColor, 4, 2); } else { r = Mid(sColor, 0, 1); g = Mid(sColor, 1, 1); b = Mid(sColor, 2, 1); r += r; g += g; b += b; } return [parseInt(r, 16), parseInt(g, 16), parseInt(b, 16)]; }, //获取渐变颜色数据 GetColor: function(c, ec, iStep) { if (c == ec) { return c; } if (c < ec) { c += iStep; return (c > ec ? ec : c); } else { c -= iStep; return (c < ec ? ec : c); } }, //获取渐变级数 GetStep: function(start, end) { var iStep = Math.abs((end - start) / this.Step); if(iStep > 0 && iStep < 1) iStep = 1; return parseInt(iStep); }, //颜色渐变 Fade: function(rColor) { clearTimeout(this._timer); var er = rColor[0], eg = rColor[1], eb = rColor[2], r = this.GetColor(this._color[0], er, this._arrStep[0]), g = this.GetColor(this._color[1], eg, this._arrStep[1]), b = this.GetColor(this._color[2], eb, this._arrStep[2]); this._set("#" + Hex(r) + Hex(g) + Hex(b)); this._color = [r, g, b]; if(r != er || g != eg || b != eb){ var oThis = this; this._timer = setTimeout(function(){ oThis.Fade(rColor); }, this.Speed); } }};//返回16进制数function Hex(i) { if (i < 0) return "00"; else if (i > 255) return "ff"; else { var str = "0" + i.toString(16); return str.substring(str.length - 2); }}//仿asp的mid 截字function Mid(string, start, length) { if (length) return string.substring(start, start + length); else return string.substring(start);}</script></head><body><div id="idDiv" style="padding:10px;">颜色渐变效果</div><style type="text/css">#idMenu{ clear:both; height:35px; background:#DBDBDB; width:560px;}#idMenu li{ float:left; line-height:25px; width:100px; text-align:center; margin:5px; cursor:pointer;}</style><ul id="idMenu"><li>菜单</li><li>菜单</li><li>菜单</li><li>菜单</li><li>菜单</li></ul><script>new ColorFade("idDiv", { StartColor: "#000", EndColor: "#fff" });new ColorFade("idDiv", { StartColor: "#fff", EndColor: "#000", Background: true });var objs = document.getElementById("idMenu").getElementsByTagName("li");for(var i = 0, len = objs.length; i < len; i++){ new ColorFade(objs[i], { StartColor: "#333", EndColor: "#fff", Speed: 20 }); new ColorFade(objs[i], { StartColor: "#f6f6f6", EndColor: "#3ea936", Background: true, Speed: 20 });}</script></body></html><br /><center>如不能显示效果，请按Ctrl+F5刷新本页，更多网页代码：<a href='http://www.wfuyu.com/' title="liehuo.net" target='_blank'>http://www.wfuyu.com/</a></center>
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