JavaScript HEX转RGB转换器

Posted 2021-05-20

function hex2rgb(hex) {
  if (hex[0]=="#") hex=hex.substr(1);
  if (hex.length==3) {
    var temp=hex; hex='';
    temp = /^([a-f0-9])([a-f0-9])([a-f0-9])$/i.exec(temp).slice(1);
    for (var i=0;i<3;i++) hex+=temp[i]+temp[i];
  }
  var triplets = /^([a-f0-9]{2})([a-f0-9]{2})([a-f0-9]{2})$/i.exec(hex).slice(1);
  return {
    red:   parseInt(triplets[0],16),
    green: parseInt(triplets[1],16),
    blue:  parseInt(triplets[2],16)
  }
}

// Example
var hex = "#fA0";
var rgb = hex2rgb(hex);
document.write("<pre>"+hex+" \u2192 rgb("+rgb.red+","+rgb.green+","+rgb.blue+")</pre>");