[JS] HEX颜色转换成RGBA

function change(hex) {
if (hex.length < 9 || hex[0] != '#') return hex
let r = parseInt(hex.slice(1, 3), 16)
let g = parseInt(hex.slice(3, 5), 16)
let b = parseInt(hex.slice(5, 7), 16)
let a = parseInt(hex.slice(7, 9), 16)
let res = 'rgba(' + r + ',' + g + ',' + b + ',' + a + ')'
return res
}
let rgba = change('#ffffff00')
console.log(rgba)