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find() And findIndex() 用来查找目标元素
let arr = [11, 2, 3, 4, 15, 6, 7, 8, 9, 10]
_Find = (arr, num) => arr.find(item => item > num)
console.log(_Find(arr, 10)) // 11 返回的是满足条件的那个值
_FindIndex = (arr, num) => arr.findIndex( (item, index) => item > num)
console.log(_FindIndex(arr, 13)) // 4 返回的是满足条件值的索引