String contains another string [duplicate]

This question already has answers here: How to check whether a string contains a substring in JavaScript? (3 answers) Closed 9 years ago.

How can I check if a string c开发者_高级运维ontains another string instead of using "==" to compare the whole string?

Regards

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You can use .indexOf():

if(str.indexOf(substr) > -1) {

}