数值每三位加逗号(钱转换)

function toThousands(number) {  

  var arr = String(number).split('.'); 

   var num = arr[0], result = '';

    while (num.length > 3) {

         result = ',' + num.slice(-3) + result;

         num = num.slice(0, num.length -3);

    }

    if (num.length > 0) result = num + result;

        return arr[1] ? result + '.' + arr[1] : result

    }

}