格式化数字串隔3个就断

整数缝三

function fnInttrunt(number) {　
　let intPart = Number(number)|0; //获取整数部分
   return  intPart.toString().replace(/(\d)(?=(?:\d{3})+$)/g, '$1,')
}

小数逢三

function fnfloattrunt(number) {　
　let intPart = Number(number); 
   return  intPart.toString().replace(/\d(?=(\d{3})+\.)/g,'$&,');
}