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<!DOCTYPE html> <html> <body> <script> var a = "Tai lieu hoc JavaScript"; var num1 = a.length; var num2 = "HTML".length; document.write(num1); document.write("<hr>"); document.write(num2); </script> </body> </html>
<!DOCTYPE html> <html> <body> <script> var a = "Tai lieu hoc JavaScript"; var num1 = a.length; var num2 = "HTML".length; document.write(num1); document.write("<hr>"); document.write(num2); </script> </body> </html>