js中转换数字格式

//四舍五入
var roundDecimal = function (val, precision) {
  return Math.round(Math.round(val * Math.pow(10, (precision || 0) + 1)) / 10) / Math.pow(10, (precision || 0));
}


//1,111,111.00
d.toFixed(2).toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");