JavaScript or jQuery equivalent of PHP's strstr() function

Question

Is there a function in jQuery or JavaScript that does the same as strstr() in PHP?

I have an AJAX response that should be 1,2,3,12,13,23 or 123. I want

Answer 1

 const isSame = function(indx, haystack, needle){
    let j = 0;
    for(let i=indx, len = indx + needle.length; i< len; i++) {
       if (haystack[i] !== needle[j++]){
          return false;      
       }
    }
    return true;
}

var strStr = function(haystack, needle) {
    if (!needle) {
        return 0;
    }
        
    for(let i=0; i

Base conditions:- when needle is empty string, it will return 0. If there is no match found it will return -1.