Run ❯
Get your own website
❯Run Code Ctrl+Alt+R
Save Code Ctrl+Alt+A
Change Orientation Ctrl+Alt+O
Change Theme Ctrl+Alt+D
Go to Spaces Ctrl+Alt+P
<!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 src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>