>[info] 数字前置补零 ~~~ /** * 数字前置补零 * @param num 数字 * @param length 位数 * @returns {string} */ export function digit(num, length) { let str = ''; num = String(num); length = length || 2; for (let i = num.length; i < length; i++) { str += '0'; } return num < Math.pow(10, length) ? str + (num | 0) : num; } ~~~