var iValue = 20002365879; //要轉換的數字var sValue = iValue+'';var aValue = new Array();var iNum = sValue.length%3;var aResult; //轉換結果var index = 0;if(sValue.length<=3){	console.log(sValue);}else{	if(iNum == 0){	for(var i=0; i<sValue.length; i=i+3){		aValue[index] = sValue[i]+''+sValue[i+1]+''+sValue[i+2];		index++;	}}else if(iNum == 1){	aValue[0] = sValue[0];	index = 1;	for(var i=1; i<sValue.length; i=i+3){		aValue[index] = sValue[i]+''+sValue[i+1]+''+sValue[i+2];		index++;	}}else if(iNum == 2){	aValue[0] = sValue[0]+''+sValue[1];	index = 1;	for(var i=2; i<sValue.length; i=i+3){		aValue[index] = sValue[i]+''+sValue[i+1]+''+sValue[i+2];		index++;	}}aResult = aValue.join(',');console.log(aResult.toString());//輸出20,002,365,879}