例1：选出最大值：
<script>function getmax(x, y) {return x > y ? x : y}let max = getmax(1, 3)</script>
例2：返回数组的最大值
<script>function getArrValue(arr = []) {let max = arr[0]for (let i = 1; i < arr.length; i++) {if (arr[i] > max) max = arr[i]}return max}let a = getArrValue([1, 5, 6, 8, 3, 2, 4, 7])document.write(a)</script>
例3：时间转换
<script>let second = prompt('请输入秒数')function getTime(t) {d = parseInt(t / 60 / 60 / 24)h = parseInt(t / 60 / 60 % 24)m = parseInt(t / 60 % 60)s = parseInt(t % 60)if (d < 10) d = '0' + dif (h < 10) h = '0' + hif (m < 10) m = '0' + mif (s < 10) s = '0' + sdocument.write(`${second}秒转换之后为${d}天${h}小时${m}分钟${s}秒`)}getTime(second)</script>
