js千分位分隔，数字货币化方法学习记录

 	// 整数货币化     function intCurrency(num) {         var reg = new RegExp("^[\d]+[\d|.]+$", 'g')         if (!reg.test(num)) {             return "只能为整数或小数！";         }         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("------------整数货币化")     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")) 

 	// 整数部分     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(",");         }     }     // 小数部分     function decimalCurrency(num) {         if (num === undefined) {             return '';         }         var len = num.length; // 小数部分长度         if (len < 3) { // 小于三位数             return num;         }         var n = len % 3;         if (n > 0) { // 位数不是3的倍数             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(',')         }     } 	// 货币化     function currency(num) {         var integerPart; // 整数部分         var decmialPart; // 小数部分         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("------------整数或小数货币化")     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")) 

 	// 直接使用正则     function currency(num) {         num = parseInt(num);         return num.toString().replace(/B(?=(d{3})+(?!d))/g, ',');     }     console.group("------------取整数，正则货币化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")) 

 	// 直接使用正则     function currency(num) {         num = parseInt(num);         return num.toString().replace(/(?=(B)(d{3})+$)/g, ',');     }     console.group("------------取整数，正则货币化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")) 

// 正整数或小数 /^[0-9]+(.[0-9]+)?$/g // 正、负整数或小数，也可不输入正负 /^(+|-)?d+(.d+)?$/g