replacing characters by color in a string in javascript

I’m having trouble replacing a “^number” character with a color in js.

I have a code in php that I am trying to pass to js but I am not successful.

function ColorizeName($s) {

    $pattern[0]="^0";   $replacement[0]='</font><font color="black">';
    $pattern[1]="^1";   $replacement[1]='</font><font color="red">';
    $pattern[2]="^2";   $replacement[2]='</font><font color="lime">';
    $pattern[3]="^3";   $replacement[3]='</font><font color="yellow">';
    $pattern[4]="^4";   $replacement[4]='</font><font color="blue">';
    $pattern[5]="^5";   $replacement[5]='</font><font color="aqua">';
    $pattern[6]="^6";   $replacement[6]='</font><font color="#FF00FF">';
    $pattern[7]="^7";   $replacement[7]='</font><font color="white">';
    $pattern[8]="^8";   $replacement[8]='</font><font color="white">';
    $pattern[9]="^9";   $replacement[9]='</font><font color="gray">';


    $s = str_replace($pattern, $replacement, htmlspecialchars($s));
    $i = strpos($s, '</font>');
    if ($i !== false){
  return substr($s, 0, $i) . substr($s, $i+7, strlen($s)) . '</font>';
}
    else{
   return $s;
}
    }

I have tried with…

function replace(str){
    var strArr = str.split("");
    for(var i=0; i<strArr.length; i++){

          if(strArr[i]=="^2"){
            strArr[i].replace("^2","<font color='blue'> </font>");
          }
         
          return str;
    }
}

If anyone has any ideas, they are welcome.

Thanks a lot.