As JavaScript is case sensitive, so case-sensitive comparison are simple string comparisons. This can be done without using any JavaScript method:
<!DOCTYPE html> <html> <body> <h3>JavaScript Strings</h3> <p id="test"></p> <script> var str1 = "amit"; if (str1 === "amit") { document.getElementById("test").innerHTML = "correct" } </script> </body> </html>