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<!DOCTYPE html> <html> <body> <h1>My First JavaScript</h1> <p>Please input a number.</p> <input id="demo" type="text"> <script> function myFunction() { var x=document.getElementById("demo").value; if(x==""||isNaN(x)) { alert("Not Numeric"); } } </script> <button type="button" onclick="myFunction()">Click Me!</button> </body> </html>
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