ce4c83ff
 wxy
初始提交
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var nodes = require('../nodes')
, rgba = require('./rgba');
/**
* Return the alpha component of the given `color`,
* or set the alpha component to the optional second `value` argument.
*
* Examples:
*
* alpha(#fff)
* // => 1
*
* alpha(rgba(0,0,0,0.3))
* // => 0.3
*
* alpha(#fff, 0.5)
* // => rgba(255,255,255,0.5)
*
* @param {RGBA|HSLA} color
* @param {Unit} [value]
* @return {Unit|RGBA}
* @api public
*/
module.exports = function alpha(color, value){
color = color.rgba;
if (value) {
return rgba(
new nodes.Unit(color.r),
new nodes.Unit(color.g),
new nodes.Unit(color.b),
value
);
}
return new nodes.Unit(color.a, '');
};
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