How to check a String contains another sub string using JavaScript

Question

I am trying to verify that a string contains another sub string , Because I am using JavaScript so String.contains() method is not working in this case.

Please help me out on this. Thanks For your help! 

Answer 1

First of all i would like to let know about indexOf() its a method which returns index within the calling String ,When it does not found any value so it returns -1.

For more info of  indexOf()

 

See this code here: 

 

var s = "foo";

alert(s.indexOf("oo") > -1);

I hope you got my point.