js千分位分隔，數字貨幣化—4種方法（含正則）

方法1-整數貨幣化

 	// 整數貨幣化
    function intCurrency(num) {
        var reg = new RegExp("^[\\d]+[\\d|.]+$", 'g')
        if (!reg.test(num)) {
            return "只能為整數或小數！";
        }
        var numString = parseInt(num).toString();
        var len = numString.length;
        if (len < 3) {
            return num;
        }
        var n = len % 3;
        if (n > 0) {
            return numString.slice(0, n) + "," + numString.slice(n, len).match(/\d{3}/g).join(",");
        } else {
            return numString.slice(n, len).match(/\d{3}/g).join(",");
        }
    }
    console.group("------------整數貨幣化")
    console.log(intCurrency("abs"))
    console.log(intCurrency("0"))
    console.log(intCurrency("10"))
    console.log(intCurrency("100"))
    console.log(intCurrency("1000"))
    console.log(intCurrency("10000"))
    console.log(intCurrency("100000"))
    console.log(intCurrency("1000000"))
    console.log(intCurrency("10000000"))
    console.log(intCurrency("100000000"))
    console.log(intCurrency("1000000000"))
    console.log(intCurrency("1000000000.0"))
    console.log(intCurrency("1000000000.00"))
    console.log(intCurrency("1000000000.000"))

方法2-小數貨幣化

 	// 整數部分
    function intCurrency(num) {
        if (num === undefined) {
            return '';
        }
        var len = num.length;
        if (len < 3) {
            return num;
        }
        var n = len % 3;
        if (n > 0) {
            return num.slice(0, n) + "," + num.slice(n, len).match(/\d{3}/g).join(",");
        } else {
            return num.slice(n, len).match(/\d{3}/g).join(",");
        }
    }
    // 小數部分
    function decimalCurrency(num) {
        if (num === undefined) {
            return '';
        }
        var len = num.length; // 小數部分長度
        if (len < 3) { // 小於三位數
            return num;
        }
        var n = len % 3;
        if (n > 0) { // 位數不是3的倍數
            return num.slice(0, len - n).match(/\d{3}/g).join(',') + ',' + num.slice(len - n);
        } else {
            return num.slice(0, len - n).match(/\d{3}/g).join(',')
        }
    }
	// 貨幣化
    function currency(num) {
        var integerPart; // 整數部分
        var decmialPart; // 小數部分
        num = num.toString();
        if (num.includes(".")) {
            integerPart = num.split('.')[0];
            decmialPart = num.split('.')[1];
        } else {
            integerPart = num;
        }
        return intCurrency(integerPart) + (decmialPart !== undefined ? ('.' + decimalCurrency(decmialPart)) : '');
    }
    console.group("------------整數或小數貨幣化")
    console.log(currency("0"))
    console.log(currency("10"))
    console.log(currency("100"))
    console.log(currency("1000"))
    console.log(currency("10000"))
    console.log(currency("100000"))
    console.log(currency("1000000"))
    console.log(currency("10000000"))
    console.log(currency("100000000"))
    console.log(currency("1000000000"))
    console.log(currency("1000000000.0"))
    console.log(currency("1000000000.00"))
    console.log(currency("1000000000.000"))
    console.log(currency("1000000000.0000"))
    console.log(currency("1000000000.00000"))

方法3-整數正則貨幣化1

 	// 直接使用正則
    function currency(num) {
        num = parseInt(num);
        return num.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ',');
    }
    console.group("------------取整數，正則貨幣化1")
    console.log(currency("0"))
    console.log(currency("10"))
    console.log(currency("100"))
    console.log(currency("1000"))
    console.log(currency("10000"))
    console.log(currency("100000"))
    console.log(currency("1000000"))
    console.log(currency("10000000"))
    console.log(currency("100000000"))
    console.log(currency("1000000000"))
    console.log(currency("1000000000.0"))
    console.log(currency("1000000000.00"))
    console.log(currency("1000000000.000"))
    console.log(currency("1000000000.0000"))
    console.log(currency("1000000000.00000"))

方法4-整數正則貨幣化2

 	// 直接使用正則
    function currency(num) {
        num = parseInt(num);
        return num.toString().replace(/(?=(\B)(\d{3})+$)/g, ',');
    }
    console.group("------------取整數，正則貨幣化2")
    console.log(currency("0"))
    console.log(currency("10"))
    console.log(currency("100"))
    console.log(currency("1000"))
    console.log(currency("10000"))
    console.log(currency("100000"))
    console.log(currency("1000000"))
    console.log(currency("10000000"))
    console.log(currency("100000000"))
    console.log(currency("1000000000"))
    console.log(currency("1000000000.0"))
    console.log(currency("1000000000.00"))
    console.log(currency("1000000000.000"))
    console.log(currency("1000000000.0000"))
    console.log(currency("1000000000.00000"))

正則校驗

// 正整數或小數 /^[0-9]+(\.[0-9]+)?$/g
// 正、負整數或小數，也可不輸入正負 /^(\+|-)?\d+(\.\d+)?$/g

轉載於：https://blog.csdn.net/Kindergarten_Sir/article/details/110382037