JS格式化钱金额加上逗号

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function formatPrice(val: string | number, precision: number = 2) {     if (typeof val === 'string') {         let num = parseFloat(val)         if (isNaN(num) || num.toString() !== val) {             return val;         }     }     let [integer, decimal = ''] = String(val).split('.')     decimal = decimal         .padEnd(precision, '0')         .slice(0, precision > 0 ? precision : 0)     integer = integer.replace(/\B(?=(\d{3})+(?!\d))/g, ',')     return [integer, decimal].join(decimal ? '.' : '')   }