JavaScript 颜色梯度和渐变效果

很久没写blog，太忙了。没什么时间写复杂的东西，重新把颜色渐变效果写一遍。
关于颜色的效果一般就两个，颜色梯度变化和样式的颜色渐变，前者在ie中一般用滤镜实现。

实例效果

预览效果1：

这是一个颜色梯度变化演示：

运行代码框
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src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/20.jpg" /><span>武邑创隆集团</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">3</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1596233" target="_blank"><img src="https://img.tulaoshi.com/201602/19/cfe8be6854058ab86081332c5f329d99_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1596233.html" target="_blank">JavaScript 经典效果集</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123"> 些很实用且必用的小脚本代码: 脚本1:进入主页以后自动播放声音  embed src="pnm://10.13.31.90/~kayvin/mihunji.rm" hidden=true autostart=true loop=true  脚本2:进入主页后自动最大话,省的去在自己单击了  script  self.moveTo(0,0)  self.resizeTo(screen.availWidth,screen.availHeight)  /script  脚本3:显示现在时间的脚本  ...<a 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前面两篇讲了颜色设置的基础和随心所欲的得到随机的颜色，希望对大家多少有所帮助。说完随机颜色，我们再讲讲颜色渐变，就像下面这个动画： 页面：点这儿参观 源代码(3K)： colortest2.zip 这样用颜色来表示y轴数值的大小，还是很直观的，怎么做的呢？有了前面关于颜色讨论的基础，我想大家应该都差不多猜出做法来了，就是把rgb中的一个跟随变量的增加而增加，就像这样...<a href="https://www.tulaoshi.com/n/20160129/1487692.html" target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/天乐帽业/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/22.jpg" /><span>天乐帽业</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">4</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1632262" target="_blank"><img src="https://img.tulaoshi.com/201602/20/4fa290f0cd011c0e2c85f75cc8219d37_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160220/1632262.html" target="_blank">JavaScript制作滚动文本效果</A></div> <div 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