转货币格式和 rgb转hex

function rgb(r, g, b){
    var tstring = function(v){return v <= 0? '00' : v >= 255 ? 'ff' : v.toString(16);};
    var result = tstring(r) + tstring(g) + tstring(b);
return result.toUpperCase();
}
console.log(rgb(456,45,-7));//rgb 转换hex

　　

 

var numberToPrice = function(number) {
  var result,num;
if(isNaN(number)||number == 0){
  return 'NaN';
}
  else{
    num = String(number).replace(/(\d+\.\d{0,2})\d*/,'$1');
    num = Number(num).toFixed(2);
    result = num.split('').reverse().join('').replace(/(\d{3}(?=\d))/g, '$1,').split('').reverse().join('');// 这句是核心，copy的。位运算能实现么？
    return result;
  }
  
  };