js判断是否存在如何操作, 下列哪个正确且最全面
A: indexOf/lastIndexOf/includes
B: lastIndexOf/includes
C: lastIndexOf/includes/has
D: lastIndexOf/includes/have/has
A: indexOf/lastIndexOf/includes
B: lastIndexOf/includes
C: lastIndexOf/includes/has
D: lastIndexOf/includes/have/has
举一反三
- 字符串的替换函数是() A: replace() B: indexOf() C: chartAt() D: lastIndexOf()
- 1. 对字符串”ababcdabcdefg”使用indexOf(‘a’)和lastIndexOf(‘a’),的运行结果是( )
- 以下关于String类的常见操作中,哪个是方法会返回指定字符ch在字符串中最后一次出现位置的索引() A: int indexOf(int ch) B: int lastIndexOf(int ch) C: int indexOf(String str) D: int lastIndexOf(String str)
- "this is a test".lastIndexOf('t')的值是:
- The human skeleton has two divisions, ____________ skeleton (includes the head, the neck and the body trunk) and __________ skeleton(includes the upper and lower limbs).