max取得数组的最大值

var arr = [1,2,3,4,5,2,2,4,52,5,6,5,4,4];
var maxNum = Math.max.apply(Math,arr);
var maxIndex = arr.indexOf(Math.max.apply(Math,arr))
console.log(maxNum);
console.log(maxIndex);

var es6Max = Math.max(...arr);
console.log(es6Max)