#### 1.es6拓展运算符... `Math.max(...arr)` ~~~ var arr = [12, 1, 10, 11, 64, 21, 78, 9]; var getMax =Math.max(...arr) console.log(getMax); //78 ~~~ #### 2.es5 apply(与方法1原理相同) `Math.max.apply(null,arr)` ~~~ var arr = [12, 1, 10, 11, 64, 21, 78, 9]; var getMax = Math.max.apply(null, arr); console.log(getMax); //78 ~~~ #### 3.for循环 ~~~ var arr = [12, 1, 10, 11, 64, 21, 78, 9]; let max = arr[0]; for (let i = 0; i < arr.length - 1; i++) { max = max < arr[i+1] ? arr[i+1] : max } console.log(max); ~~~ [还有一些别的方法](https://www.cnblogs.com/iwzyuan/p/9343051.html)