JS实现颜色梯度与渐变效果完整实例

2019-11-19 18:11:36

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本文实例讲述了JS实现颜色梯度与渐变效果的方法。分享给大家供大家参考，具体如下：

运行效果图如下：

完整实例代码如下：

<!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=utf-8" /><title>JavaScript 颜色梯度和渐变效果</title><script type="text/javascript">var $ = function (id) {  return "string" == typeof id ? document.getElementById(id) : id;};var Extend = function(destination, source) { for (var property in source) { destination[property] = source[property]; } return destination;}var Map = function(array, callback, thisObject){ if(array.map){ return array.map(callback, thisObject); }else{ var res = []; for (var i = 0, len = array.length; i < len; i++) { res.push(callback.call(thisObject, array[i], i, array)); } return res; }}var ColorGrads = function(options){ this.SetOptions(options); this.StartColor = this.options.StartColor; this.EndColor = this.options.EndColor; this.Step = Math.abs(this.options.Step);};ColorGrads.prototype = { //设置默认属性 SetOptions: function(options) {  this.options = {//默认值 StartColor: "#fff",//开始颜色 EndColor: "#000",//结束颜色 Step: 20//渐变级数  };  Extend(this.options, options || {}); }, //获取渐变颜色集合 Create: function() { var colors = [], startColor = this.GetColor(this.StartColor), endColor = this.GetColor(this.EndColor), stepR = (endColor[0] - startColor[0]) / this.Step, stepG = (endColor[1] - startColor[1]) / this.Step, stepB = (endColor[2] - startColor[2]) / this.Step; //生成颜色集合 for(var i = 0, n = this.Step, r = startColor[0], g = startColor[1], b = startColor[2]; i < n; i++){ colors.push([r, g, b]); r += stepR; g += stepG; b += stepB; } colors.push(endColor); //修正颜色值 return Map(colors, function(x){ return Map(x, function(x){ return Math.min(Math.max(0, Math.floor(x)), 255); });}); }, //获取颜色数据 GetColor: function(color) { if(/^#[0-9a-f]{6}$/i.test(color)) {//#rrggbb return Map([color.substr(1, 2), color.substr(3, 2), color.substr(5, 2)],  function(x){ return parseInt(x, 16); } ) } else if(/^#[0-9a-f]{3}$/i.test(color)) {//#rgb return Map([color.substr(1, 1), color.substr(2, 1), color.substr(3, 1)],  function(x){ return parseInt(x + x, 16); } ) } else if(/^rgb(.*)$/i.test(color)) {//rgb(n,n,n) or rgb(n%,n%,n%) return Map(color.match(//d+(/./d+)?/%?/g),  function(x){ return parseInt(x.indexOf("%") > 0 ? parseFloat(x, 10) * 2.55 : x, 10); } ) } else {//color var mapping = {"red":"#FF0000"};//略 color = mapping[color.toLowerCase()]; if(color){  return Map([color.substr(1, 2), color.substr(3, 2), color.substr(5, 2)],  function(x){ return parseInt(x, 16); }  ) } } }};var CurrentStyle = function(element){ return element.currentStyle || document.defaultView.getComputedStyle(element, null);}var Bind = function(object, fun) { var args = Array.prototype.slice.call(arguments).slice(2); return function() { return fun.apply(object, args.concat(Array.prototype.slice.call(arguments))); }}//渐变对象var ColorTrans = function(obj, options){ this._obj = $(obj); this._timer = null;//定时器 this._index = 0;//索引 this._colors = [];//颜色集合 this._grads = new ColorGrads(); this.SetOptions(options); this.Speed = Math.abs(this.options.Speed); this.CssColor = this.options.CssColor; this._startColor = this.options.StartColor || CurrentStyle(this._obj)[this.CssColor]; this._endColor = this.options.EndColor; this._step = Math.abs(this.options.Step); this.Reset(); this.SetColor();};ColorTrans.prototype = { //设置默认属性 SetOptions: function(options) { this.options = {//默认值 StartColor: "",//开始颜色 EndColor: "#000",//结束颜色 Step: 20,//渐变级数 Speed: 20,//渐变速度 CssColor: "color"//设置属性（Scripting属性） };  Extend(this.options, options || {}); }, //重设颜色集合 Reset: function(color) { //修改颜色后必须重新获取颜色集合 color = Extend({ StartColor: this._startColor, EndColor: this._endColor, Step: this._step }, color || {}); //设置属性 this._grads.StartColor = this._startColor = color.StartColor; this._grads.EndColor = this._endColor = color.EndColor; this._grads.Step = this._step = color.Step; //获取颜色集合 this._colors = this._grads.Create(); this._index = 0; }, //颜色渐入 FadeIn: function() { this.Stop(); this._index++; this.SetColor(); if(this._index < this._colors.length - 1){ this._timer = setTimeout(Bind(this, this.FadeIn), this.Speed); } }, //颜色渐出 FadeOut: function() { this.Stop(); this._index--; this.SetColor(); if(this._index > 0){ this._timer = setTimeout(Bind(this, this.FadeOut), this.Speed); } }, //颜色设置 SetColor: function() { var color = this._colors[Math.min(Math.max(0, this._index), this._colors.length - 1)]; this._obj.style[this.CssColor] = "rgb(" + color[0] + "," + color[1] + "," + color[2] + ")"; }, //停止 Stop: function() { clearTimeout(this._timer); }};</script></head><body><style type="text/css">#idGrads{}#idGrads div{ font-size:0;height:1px;}</style><div id="idGrads"> </div><script>var forEach = function(array, callback, thisObject){ if(array.forEach){ array.forEach(callback, thisObject); }else{ for (var i = 0, len = array.length; i < len; i++) { callback.call(thisObject, array[i], i, array); } }}var colors = new ColorGrads({ StartColor: "#fff", EndColor: "rgb(20,127,0)" }).Create();forEach(colors.concat().concat(colors.reverse()), function(x){ $("idGrads").innerHTML += "<div style=/"background-color:"+"rgb(" + x[0] + "," + x[1] + "," + x[2] + ");/"></div>";})</script><Br /><Br /><style type="text/css">#idMenu{ background:#DBDBDB;text-align:center;line-height:25px; table-layout:fixed;}#idMenu td{ cursor:pointer;}</style><table id="idMenu" width="600" border="0" cellspacing="5" cellpadding="0"> <tr> <td onclick="location.href='#'">Cropper</td> <td onclick="location.href='#'">Tween</td> <td onclick="location.href='#'">Slider</td> <td onclick="location.href='#'">Resize</td> <td onclick="location.href='#'">Drag</td> </tr></table><script>forEach($("idMenu").getElementsByTagName("td"), function(x, i){ var ct1 = new ColorTrans(x, { StartColor: "#666", EndColor: "#fff" }); var ct2 = new ColorTrans(x, { StartColor: "#f6f6f6", EndColor: "rgb(20,150,0)", CssColor: "backgroundColor" }); x.onmouseover = function(){ ct1.FadeIn(); ct2.FadeIn(); } x.onmouseout = function(){ ct1.FadeOut(); ct2.FadeOut(); }})</script><Br /><Br /><div id="idRandom" style="padding:10px;color:#fff; background-color:#CCC;">点击随机换颜色</div><script>var ctRandom = new ColorTrans("idRandom", { EndColor: "#CCC", CssColor: "backgroundColor" })$("idRandom").onclick = function(){ var rgb = Map([1,1,1], function(){ return Math.floor((Math.random() * 255)); } ); ctRandom.Reset({ StartColor: this.style.backgroundColor, EndColor: "rgb(" + rgb[0] + "," + rgb[1] + "," + rgb[2] + ")" }) ctRandom.FadeIn();}</script></body></html>

PS：这里再为大家推荐几款本站的相关在线工具：

在线RGB、HEX颜色代码生成器：
http://tools.VeVB.COm/color/rgb_color_generator

RGB颜色查询对照表_颜色代码表_颜色的英文名称大全：
http://tools.VeVB.COm/color/jPicker

在线网页调色板工具：
http://tools.VeVB.COm/color/color_picker

在线颜色选择器工具/RGB颜色查询对照表：
http://tools.VeVB.COm/color/colorpicker

更多关于JavaScript相关内容可查看本站专题：《JavaScript切换特效与技巧总结》、《JavaScript查找算法技巧总结》、《JavaScript动画特效与技巧汇总》、《JavaScript错误与调试技巧总结》、《JavaScript数据结构与算法技巧总结》、《JavaScript遍历算法与技巧总结》及《JavaScript数学运算用法总结》

希望本文所述对大家JavaScript程序设计有所帮助。

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