保留小数点n位且整数自动补零
/** * 保留小数点n位且整数自动补零 * */ pointFloor(num, n) { if (typeof(num) == 'number' || typeof(num) == 'string') { let numStr = num + ""; let list = numStr.split('.'); let num0 = list[0]; let num1 = list[1] || ''; num1 = (num1 + Array(n + 1).join(0)).slice(0, n); return n != 0 ? (Number(num0) + '.' + num1) : Number(num0) + ''; } else return ''; },