怎樣在數組中取最大值

let arr = [1,2,3,4,5,5,6,7];console.log(1,Math.max.apply(Math,arr));let arr2 = Math.max(1,2,3,4,5,5,6,7);console.log(2,arr2);let arr3 = Math.max.call(Math,1,2,3,4,5,5,6,7);console.log(3,arr3);

function getMax(arr) { for (let i = 0; i < arr.length; i++) { if(arr[i] >= arr[0]){ //如果后面的數組比第一個大互換位置
 let k = arr[0];
 arr[0] = arr[i];
 arr[i] = k;
 }
 } return arr[0];
}console.log(4,getMax(arr))