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<!DOCTYPE html> <html> <body> <h1>JavaScript Strings</h1> <h2>The indexOf() Method</h2> <p>Both indexOf() and lastIndexOf() return -1 if the text is not found:</p> <p id="demo"></p> <script> let text = "Please locate where 'locate' occurs!"; let index = text.indexOf("John"); document.getElementById("demo").innerHTML = index; </script> </body> </html>
