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<!DOCTYPE html> <html> <body> <p id="demo1"></p> <p id="demo2"></p> <p id="demo3"></p> <script> var a = "Tài liệu học"; var b = "HTML"; var c = " CSS"; var chuoi1 = a.concat(b); var chuoi2 = a.concat(c); var chuoi3 = a.concat(" ",b," và",c); document.getElementById("demo1").innerHTML = chuoi1; document.getElementById("demo2").innerHTML = chuoi2; document.getElementById("demo3").innerHTML = chuoi3; </script> </body> </html>
<!DOCTYPE html> <html> <body> <p id="demo1"></p> <p id="demo2"></p> <p id="demo3"></p> <script> var a = "Tài liệu học"; var b = "HTML"; var c = " CSS"; var chuoi1 = a.concat(b); var chuoi2 = a.concat(c); var chuoi3 = a.concat(" ",b," và",c); document.getElementById("demo1").innerHTML = chuoi1; document.getElementById("demo2").innerHTML = chuoi2; document.getElementById("demo3").innerHTML = chuoi3; </script> </body> </html>