这金额改写成千分位，是哪个长尾词在提问呢？

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javascriptfunction formatCurrency(num) { num=num.toString().replace(/,/g, ''); if (isNaN(num)) num=0; let sign=(num >=0) ? : -; num=Math.floor(num * 100 + 0.5); let cents=num % 100; num=Math.floor(num / 100); return sign + num.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ,);}

金额格式化千分位

function formatCurrency(num) { num = num.toString().replace(/\$|\,/g,''); if(isNaN(num)) num = "0"; sign = (num == (num = Math.abs(num))); num = Math.floor(num*100+0.50000000001); cents = num%100; num = Math.floor(num/100).toString(); if(cents<10) cents = "0" + cents; for (var i = 0; i < Math.floor((num.length-(1+i))/3); i++) num = num.substring(0,num.length-(4*i+3))+','+ num.substring(num.length-(4*i+3)); return (((sign)?'':'-') + num + '.' + cents); }