求js颜色转换算法

JavaScript05

求js颜色转换算法,第1张

(function(d){function h(a,b,e){var c="rgb"+(d.support.rgba?"a":"")+"("+parseInt(a[0]+e*(b[0]-a[0]),10)+","+parseInt(a[1]+e*(b[1]-a[1]),10)+","+parseInt(a[2]+e*(b[2]-a[2]),10)d.support.rgba&&(c+=","+(a&&b?parseFloat(a[3]+e*(b[3]-a[3])):1))return c+")"}function f(a){var breturn(b=/#([0-9a-fA-F]{2})([0-9a-fA-F]{2})([0-9a-fA-F]{2})/.exec(a))?[parseInt(b[1],16),parseInt(b[2],16),parseInt(b[3],16),1]:(b=/#([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])/.exec(a))?[17*parseInt(b[1],16),17*parseInt(b[2],

16),17*parseInt(b[3],16),1]:(b=/rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec(a))?[parseInt(b[1]),parseInt(b[2]),parseInt(b[3]),1]:(b=/rgba\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9\.]*)\s*\)/.exec(a))?[parseInt(b[1],10),parseInt(b[2],10),parseInt(b[3],10),parseFloat(b[4])]:l[a]}d.extend(!0,d,{support:{rgba:function(){var a=d("script:first"),b=a.css("color"),e=!1if(/^rgba/.test(b))e=!0else try{e=b!=a.css("color","rgba(0, 0, 0, 0.5)").css("color"),

a.css("color",b)}catch(c){}return e}()}})var k="color backgroundColor borderBottomColor borderLeftColor borderRightColor borderTopColor outlineColor".split(" ")d.each(k,function(a,b){d.Tween.propHooks[b]={get:function(a){return d(a.elem).css(b)},set:function(a){var c=a.elem.style,g=f(d(a.elem).css(b)),m=f(a.end)a.run=function(a){c[b]=h(g,m,a)}}}})d.Tween.propHooks.borderColor={set:function(a){var b=a.elem.style,e=[],c=k.slice(2,6)d.each(c,function(b,c){e[c]=f(d(a.elem).css(c))})var g=f(a.end)

a.run=function(a){d.each(c,function(d,c){b[c]=h(e[c],g,a)})}}}var l={aqua:[0,255,255,1],azure:[240,255,255,1],beige:[245,245,220,1],black:[0,0,0,1],blue:[0,0,255,1],brown:[165,42,42,1],cyan:[0,255,255,1],darkblue:[0,0,139,1],darkcyan:[0,139,139,1],darkgrey:[169,169,169,1],darkgreen:[0,100,0,1],darkkhaki:[189,183,107,1],darkmagenta:[139,0,139,1],darkolivegreen:[85,107,47,1],darkorange:[255,140,0,1],darkorchid:[153,50,204,1],darkred:[139,0,0,1],darksalmon:[233,150,122,1],darkviolet:[148,0,211,1],fuchsia:[255,

0,255,1],gold:[255,215,0,1],green:[0,128,0,1],indigo:[75,0,130,1],khaki:[240,230,140,1],lightblue:[173,216,230,1],lightcyan:[224,255,255,1],lightgreen:[144,238,144,1],lightgrey:[211,211,211,1],lightpink:[255,182,193,1],lightyellow:[255,255,224,1],lime:[0,255,0,1],magenta:[255,0,255,1],maroon:[128,0,0,1],navy:[0,0,128,1],olive:[128,128,0,1],orange:[255,165,0,1],pink:[255,192,203,1],purple:[128,0,128,1],violet:[128,0,128,1],red:[255,0,0,1],silver:[192,192,192,1],white:[255,255,255,1],yellow:[255,255,

0,1],transparent:[255,255,255,0]}})(jQuery)

js将十六进制颜色转透明度的函数

CSS颜色的表示方式一般有两种10进制与16进制,分别是【rgb(255, 100, 0)】【#FF0000】。两个16进制组合数是0-255(16*16=256)。

颜色是RGB红绿蓝三原色组成的,16进制的颜色由6位字符组成(如:FF0000,相隔重复类型也可以简写成F00),如果16进制要包含透明度必须由八位字符组成(如:FFDDAA80)。

平时css样式的透明度都是按十进制计算的,如:opacity: 0.5与background-color: rgba(255, 100, 0, 0.8)。

10进制的255阶为不透明(0%),0阶为100%透明。所以如果要获取50%透明度,255 * 0.5 = 127.5将127.5四舍五入再转16进制,方法如下:

下面方法是0%-100%的透明度输出:

工具:电脑;浏览器;ultraedit软件;

操作步骤如下:

1、打开UE编辑器,新建一个空白的html文件和css文件;

2、在html文件中输入以下html代码;

3、在css文件中输入以下css代码;

4、编辑完成之后,选择格式为UTF8-无 BOM模式,保存文件;

5、在浏览器中打开此html文件,可以看到最终想要实现的遮住全屏效果。