完美解决 function _comma(number) { if(number <0){ number = -number if (number < 1000) { console.log(1111111) return '-' + number.toString(); } else { return "-" + _comma(Math.floor(number / 1000)) + "," +( _comma(number % 1000) == 0 ? '000' : _comma(number % 1000)); } }else{ if (number < 1000) { return number.toString(); } else { return _comma(Math.floor(number / 1000)) + "," +( _comma(number % 1000) == 0 ? '000' : _comma(number % 1000)); } }