ویرایش »
<!DOCTYPE html> <html> <body> <p id="demo">Click the button to return the number of characters in the string "Hello World!".</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var str="Hello World!"; var n=str.length; document.getElementById("demo").innerHTML=n; } </script> </body> </html>
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