本文实例讲述了JavaScript判断数组是否包含指定元素的方法.分享给大家供大家参考.具体如下: 这段代码通过prototype定义了数组方法,这样就可以在任意数组调用contains方法 /** * Array.prototype.[method name] allows you to define/overwrite an objects method * needle is the item you are searching for * this is a special variab…
在python中判断 list 中是否包含某个元素: ——可以通过in和not in关键字来判读 例如: abcList=['a','b','c',1,2,3] if 'a' in abcList: print('a is in abcList') if 'd' not in abcList: print('d is not in abcList') if 1 in abcList: print('1 is in abcList') 结果为:…
在python中可以通过in和not in关键字来判读一个list中是否包含一个元素: str = ['s','i','m','o','n'] if 'e' in str: print("e in str") else: print('e not in str') 输出:e not in str if 's' in str : print('s in str') 输出:s in str in 和 not in 是非常常用的关键字.…
在python中可以通过in和not in关键字来判读一个list中是否包含一个元素 pythontab = ['p','y','t','h','o','n','t','a','b'] if 't' in pythontab: print 't in pythontab' if 'w' not in theList: print 'w is not in pythontab'…
在python中可以通过in和not in关键字来判读一个list中是否包含一个元素 theList = ['a','b','c'] if 'a' in theList: print 'a in the list' else: print 'a is not in the list' if 'd' not in theList: print 'd is not in the list' else: print 'd in the list'…
验证JS中是否包含重复元素,有重复返回true:否则返回false 方案一. function isRepeat(data) { var hash = {}; for (var i in data) { if (hash[data[i]]) { return true; } // 不存在该元素,则赋值为true,可以赋任意值,相应的修改if判断条件即可 hash[data[i]] = true; } return false; } 方案二. function isRepeat(arrs) { i…
Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears at least twice in the array, and it should return false if every element is distinct. Example 1: Input: [1,2,3,1] Output: tru…
Given an array of integers and an integer k, find out whether there are two distinct indices i and j in the array such that nums[i] = nums[j] and the absolute difference between i and j is at most k. Example 1: Input: nums = [1,2,3,1], k = 3 Output:…
