28. Implement strStr()
Implement strStr().
Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.
Example 1:
Input: haystack = "hello", needle = "ll"Output: 2
Example 2:
Input: haystack = "aaaaa", needle = "bba"Output: -1
题意：实现一个函数strStr(),接收两个参数，haystack中是否存在needle子串，存在则返回needle首字符在haystack中的索引，不存在则返回-1
代码如下：
/** * @param {string} haystack * @param {string} needle * @return {number} */var strStr = function(haystack, needle) { ???let hLen=haystack.length; ???let nLen=needle.length; ???let str=‘‘; ???for(var i=0;i<=hLen-nLen;i++){ ???????str=haystack.slice(i,nLen+i); ???????if( str === needle) return i; ???} ???return -1};28. Implement strStr()（js）
原文地址：https://www.cnblogs.com/xingguozhiming/p/10392851.html