JS教程:制作颜色梯度和渐变效果

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type="text/javascript"//获取颜色梯度方法var ColorGrads = (function(){//获取颜色梯度数据function GetStep(start, end, step) {var colors = [], start = GetColor(start), end = GetColor(end),stepR = (end[0] - start[0]) / step,stepG = (end[1] - start[1]) / step,stepB = (end[2] - start[2]) / step;//生成颜色集合for(var i = 0, r = start[0], g = start[1], b = start[2]; i step; i++){colors[i] = [r, g, b]; r += stepR; g += stepG; b += stepB;}colors[i] = end;//修正颜色值return $$A.map(colors, function(x){ return $$A.map(x, function(x){return Math.min(Math.max(0, Math.floor(x)), 255);});});}//获取颜色数据var frag;function GetColor(color) {var ret = GetData(color);if (ret === undefined) {if (!frag) {frag = document.createElement("textarea");frag.style.display = "none";document.body.insertBefore(frag, document.body.childNodes[0]);};try { frag.style.color = color; } catch(e) { return [0, 0, 0]; }//ie operaif (document.defaultView) {//opera #rrggbbret = GetData(document.defaultView.getComputedStyle(frag, null).color);} else {color = frag.createTextRange().queryCommandValue("ForeColor");ret = [ color & 0x0000ff, (color & 0x00ff00) 8, (color & 0xff0000) 16 ];}}return ret;}//获取颜色数组function GetData(color) {var re = RegExp;if (/^#([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{2})$/i.test(color)) {//#rrggbbreturn $$A.map([ re.$1, re.$2, re.$3 ], function(x){return parseInt(x, 16);});} else if (/^#([0-9a-f])([0-9a-f])([0-9a-f])$/i.test(color)) {//#rgbreturn $$A.map([ re.$1, re.$2, re.$3 ], function(x){return parseInt(x + x, 16);});} else if (/^rgb((.*),(.*),(.*))$/i.test(color)) {//rgb(n,n,n) or rgb(n%,n%,n%)return $$A.map([ re.$1, re.$2, re.$3 ], function(x){return x.indexOf("%") 0 ？ parseFloat(x, 10) * 2.55 : x | 0;});}}return function(colors, step){var ret = [], len = colors.length;if ( step === undefined ) { step = 20; }if ( len == 1 ) {ret = GetStep( colors[0], colors[0], step );} else if ( len 1 ) {for(var i = 0, n = len - 1; i n; i++){var steps = GetStep( colors[i], colors[i+1], step );i n - 1 && steps.pop();ret = ret.concat(steps);}}return ret;}})();//渐变对象var ColorTrans = function(elem, options){this._elem = $$(elem);this._timer = null;//定时器this._index = 0;//索引this._colors = [];//颜色集合this._options = {};//参数对象this._setOptions(options);this.speed = Math.abs(this.options.speed);this.style = this.options.style;this.reset({from: this.options.from || $$D.getStyle(this._elem, this.style),to: this.options.to,step: Math.abs(this.options.step)});this._set();};ColorTrans.prototype = {//设置默认属性_setOptions: function(options) {this.options = {//默认值from:"",//开始颜色(默认空值方便自动获取)to:"#000",//结束颜色step:20,//渐变级数speed:20,//渐变速度style:"color"//设置属性（Scripting属性）};$$.extend(this.options, options || {});},//重设颜色集合reset: function(options) {//根据参数设置属性this._options = options = $$.extend( this._options, options || {} );//获取颜色集合this._colors = ColorGrads( [ options.from, options.to ], options.step );this._index = 0;},//颜色渐入transIn: function() {this.stop(); this._index++; this._set();if(this._index this._colors.length - 1){this._timer = setTimeout($$F.bind( this.transIn, this ), this.speed);}},//颜色渐出transOut: function() {this.stop(); this._index--; this._set();if(this._index 0){this._timer = setTimeout($$F.bind( this.transOut, this ), this.speed);}},//颜色设置_set: function() {var color = this._colors[Math.min(Math.max(0, this._index), this._colors.length - 1)];this._elem.style[this.style] = "rgb(" + color.join(",") + ")";},//停止stop: function() {clearTimeout(this._timer);}};/script/headbodystyle type="text/css"#idGrads div{height:1px;overflow:hidden;}/style颜色梯度变化演示：div id="idGrads" /divBr /input id="idGradsColor" type="text" value="green"/input id="idGradsSet" type="button" value="设置颜色"script($$("idGradsSet").onclick = function(){var colors = ColorGrads( ["#fff", $$("idGradsColor").value], 50 );$$("idGrads").innerHTML = $$A.map(colors.concat().concat(colors.reverse()), function(x){return "div style='background:rgb(" + x.join(",") + ")'/div";}).join("");})()/scriptBr /Br /style type="text/css"#idPicker ul{float:left;}#idPicker li{overflow:hidden;width:10px;height:10px;line-height:0;font-size:0;}#idPicker li.on{width:8px;height:8px; border:1px solid #000;}#idPicker ul, #idPicker li{list-style:none;margin:0;padding:0;}#idPicker:after{content:".";display:block;visibility:hidden;height:0;clear:both;}#idPicker{zoom:1;}/style简单的颜色拾取器： Br /选择颜色： span id="idPickerShow" /spandiv id="idPicker" /divscript$$("idPicker").innerHTML = "ul" +$$A.map(ColorGrads( ["red", "yellow", "blue"], 10 ), function(x){return $$A.map(ColorGrads( ["#fff", "rgb(" + x.join(",") + ")" ,"#000"], 10 ),function(x){return "li style='background:rgb(" + x.join(",") + ")'/li";}).join("");}).join("/ulul") + "/ul";var oPickerShow = $$("idPickerShow");$$A.forEach($$("idPicker").getElementsByTagName("li"), function(li){li.onmouseover = function(){this.className = "on";oPickerShow.innerHTML = oPickerShow.style.backgroundColor= this.style.backgroundColor;}li.onmouseout = function(){ this.className = ""; }})/scriptBr /Br /style type="text/css"#idMenu{ background:#DBDBDB;text-align:center;line-height:25px; table-layout:fixed;}#idMenu td{ cursor:pointer; color:#666; background:#f6f6f6;}/style颜色渐变菜单：table id="idMenu" width="600" border="0" cellspacing="5" cellpadding="0"trtda href="http://www.cnblogs.com/cloudgamer/archive/2008/07/21/ImgCropper.html"Cropper/a/tdtda href="http://www.cnblogs.com/cloudgamer/archive/2009/01/06/Tween.html"Tween/a/tdtda href="http://www.cnblogs.com/cloudgamer/archive/2008/12/24/Slider.html"Slider/a/tdtda href="http://www.cnblogs.com/cloudgamer/archive/2008/12/03/Resize.html"Resize/a/tdtda href="http://www.cnblogs.com/cloudgamer/archive/2008/11/17/Drag.html"Drag/a/tdtda href="http://www.cnblogs.com/cloudgamer/archive/2009/07/07/FixedTips.html"Tooltips/a/td/tr/tablescript$$A.forEach($$("idMenu").getElementsByTagName("td"), function(x, i){var a = x.getElementsByTagName("a")[0], href = a.href, txt = a.innerHTML;x.onclick = function(){ location.href = href; }x.innerHTML = txt;var ct1 = new ColorTrans(x, { to: "white" });var ct2 = new ColorTrans(x, { to: "rgb(20,150,0)", style: "backgroundColor" });x.onmouseover = function(){ ct1.transIn(); ct2.transIn(); }x.onmouseout = function(){ ct1.transOut(); ct2.transOut(); }})/scriptBr /Br /style type="text/css"#idRandom{padding:10px; background:#CCC; color:#fff;}/style点击随机颜色渐变：div id="idRandom"b点击随机换颜色/b/divscriptvar ctRandom = new ColorTrans("idRandom", { style: "backgroundColor" }),ctRandom2 = new ColorTrans("idRandom");$$("idRandom").onclick = function(){var rgb = $$A.map([1,1,1], function(){ return Math.floor((Math.random() * 255)); } ),rgb2 = $$A.map(rgb, function(x){ return 255 - x; } );ctRandom.reset({ from: this.style.backgroundColor, to: "rgb(" + rgb.join(",") + ")" })ctRandom.transIn();ctRandom2.reset({ from: this.style.color, to: "rgb(" + rgb2.join(",") + ")" })ctRandom2.transIn();}/script/body/html
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