function ARGBtoRGBA(num) {
num >>>= 0;
let b = num & 0xFF,
g = (num & 0xFF00) >>> 8,
r = (num & 0xFF0000) >>> 16,
a = ( (num & 0xFF000000) >>> 24 ) / 255 ;
return "rgba(" + [r, g, b, a].join(",") + ")";
}
let x = ARGBtoRGBA(4280362283);
console.log(x);
// 输出结果:rgba(33,37,43,1)