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JS實(shí)現(xiàn)顏色梯度與漸變效果完整實(shí)例

 更新時(shí)間：2016年12月30日 10:28:43   作者：蕓&魚(yú)兒  
這篇文章主要介紹了JS實(shí)現(xiàn)顏色梯度與漸變效果,結(jié)合完整實(shí)例形式分析了js顏色漸變所涉及的數(shù)學(xué)運(yùn)算與頁(yè)面樣式動(dòng)態(tài)操作相關(guān)技巧,需要的朋友可以參考下

本文實(shí)例講述了JS實(shí)現(xiàn)顏色梯度與漸變效果的方法。分享給大家供大家參考，具體如下：

運(yùn)行效果圖如下：

完整實(shí)例代碼如下：

<!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 顏色梯度和漸變效果</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 = {
 //設(shè)置默認(rèn)屬性
 SetOptions: function(options) {
  this.options = {//默認(rèn)值
 StartColor: "#fff",//開(kāi)始顏色
 EndColor: "#000",//結(jié)束顏色
 Step: 20//漸變級(jí)數(shù)
  };
  Extend(this.options, options || {});
 },
 //獲取漸變顏色集合
 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;
 //生成顏色集合
 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);
 //修正顏色值
 return Map(colors, function(x){ return Map(x, function(x){
 return Math.min(Math.max(0, Math.floor(x)), 255);
 });});
 },
 //獲取顏色數(shù)據(jù)
 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)));
 }
}
//漸變對(duì)象
var ColorTrans = function(obj, options){
 this._obj = $(obj);
 this._timer = null;//定時(shí)器
 this._index = 0;//索引
 this._colors = [];//顏色集合
 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 = {
 //設(shè)置默認(rèn)屬性
 SetOptions: function(options) {
 this.options = {//默認(rèn)值
 StartColor: "",//開(kāi)始顏色
 EndColor: "#000",//結(jié)束顏色
 Step: 20,//漸變級(jí)數(shù)
 Speed: 20,//漸變速度
 CssColor: "color"http://設(shè)置屬性（Scripting屬性）
 };
  Extend(this.options, options || {});
 },
 //重設(shè)顏色集合
 Reset: function(color) {
 //修改顏色后必須重新獲取顏色集合
 color = Extend({ StartColor: this._startColor, EndColor: this._endColor, Step: this._step }, color || {});
 //設(shè)置屬性
 this._grads.StartColor = this._startColor = color.StartColor;
 this._grads.EndColor = this._endColor = color.EndColor;
 this._grads.Step = this._step = color.Step;
 //獲取顏色集合
 this._colors = this._grads.Create();
 this._index = 0;
 },
 //顏色漸入
 FadeIn: function() {
 this.Stop(); this._index++; this.SetColor();
 if(this._index < this._colors.length - 1){
 this._timer = setTimeout(Bind(this, this.FadeIn), this.Speed);
 }
 },
 //顏色漸出
 FadeOut: function() {
 this.Stop(); this._index--; this.SetColor();
 if(this._index > 0){
 this._timer = setTimeout(Bind(this, this.FadeOut), this.Speed);
 }
 },
 //顏色設(shè)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;">點(diǎn)擊隨機(jī)換顏色</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>

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在線網(wǎng)頁(yè)調(diào)色板工具：
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http://tools.jb51.net/color/colorpicker

更多關(guān)于JavaScript相關(guān)內(nèi)容可查看本站專題：《JavaScript切換特效與技巧總結(jié)》、《JavaScript查找算法技巧總結(jié)》、《JavaScript動(dòng)畫特效與技巧匯總》、《JavaScript錯(cuò)誤與調(diào)試技巧總結(jié)》、《JavaScript數(shù)據(jù)結(jié)構(gòu)與算法技巧總結(jié)》、《JavaScript遍歷算法與技巧總結(jié)》及《JavaScript數(shù)學(xué)運(yùn)算用法總結(jié)》

希望本文所述對(duì)大家JavaScript程序設(shè)計(jì)有所幫助。

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