function hexify(color) {
var values = color
.replace(/rgba?\(/, '')
.replace(/\)/, '')
.replace(/[\s+]/g, '')
.split(',');
var a = parseFloat(values[3] || 1),
r = Math.floor(a * parseInt(values[0]) + (1 - a) * 255),
g = Math.floor(a * parseInt(values[1]) + (1 - a) * 255),
b = Math.floor(a * parseInt(values[2]) + (1 - a) * 255);
return "#" +
("0" + r.toString(16)).slice(-2) +
("0" + g.toString(16)).slice(-2) +
("0" + b.toString(16)).slice(-2);
}
var myHex = hexify('rgba(255,232,186,0.4)'); // "#f5faf3"
console.log(myHex);
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原文链接：https://blog.csdn.net/wu_xianqiang/article/details/81587780