如何将阿拉伯数字每三位一逗号分隔，如：15000000转化为15,000,000

"15000000".split("").reverse().join("").replace(/(\d{3})/g, "$1,").split("").reverse().join("");

"115000000".split("").reverse().join("").replace(/(\d{3})(?=[^$])/g, "$1,").split("").reverse().join("");

var cutStr = function(str)

{

  var newStr= new Array(str.length+ parseInt(str.length/3));

  newStr[newStr.length-1]=str[str.length-1];

  var currentIndex=str.length-1;

  for(var i = newStr.length-1;i >= 0;i--)

  {

    if((newStr.length-i)%4==0)

    {

      newStr[i]=",";

    }

    else

    {

      newStr[i]=str[currentIndex--];

    }

  }

  return newStr.join("")

}

var num="15000000";

console.log(cutStr(num));

function cutStr(str){

    var rmb='';

    var i2=0;

    for(var i=str.length-1; i>=0; i--){

 

        if(i%3==0&&i!=0){

            rmb+=str[i2]+',';

        }else{

            rmb+=str[i2];

        }

        i2++;

    }

    return rmb;

}

console.log(cutStr(num));

function cutStr(num) {

    var aaa = num.toString();

    var arr1 = aaa.split("");

    var arr2 = [];

    for (var i = 0; i < arr1.length;) {

 

        for (j = 0; j < 3; j++) {

 

            arr2.unshift(arr1[i]);

            i++;

            if (j == 2 && i < arr1.length) {

                arr2.unshift(",");

            }

        }

    }

 

    alert(arr2.join(""));

}

cutStr(12345678);

'1500000000000'.replace(/\B(?=(\d{3})+$)/g,',')

function formatNumber(value) {

    value = value.toString();

    if (value.length <= 3) {

        return value;

    } else {

        return formatNumber(value.substr(0, value.length - 3)) + ',' + value.substr(value.length - 3);

    }

}

 

console.log(formatNumber(12345678))

var str = '123123211312.333123'.replace(/(?=(?!^)(?:\d{3})+(?:\.|$))(\d{3}(\.\d+$)?)/g,',$1');

console.log(str)

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