Sublime Text
<!DOCTYPE html> <html> <body> <span id="demo1"></span> <span id="demo2"></span><br> <span id="demo3"></span> <span id="demo4"></span> <script> var a = " Tài liệu học HTML "; var b = a.trim(); document.getElementById("demo1").innerHTML = a; document.getElementById("demo2").innerHTML = a.length + " ký tự"; document.getElementById("demo3").innerHTML = b; document.getElementById("demo4").innerHTML = b.length + " ký tự"; </script> </body> </html>
<!DOCTYPE html> <html> <body> <span id="demo1"></span> <span id="demo2"></span><br> <span id="demo3"></span> <span id="demo4"></span> <script> var a = " Tài liệu học HTML "; var b = a.trim(); document.getElementById("demo1").innerHTML = a; document.getElementById("demo2").innerHTML = a.length + " ký tự"; document.getElementById("demo3").innerHTML = b; document.getElementById("demo4").innerHTML = b.length + " ký tự"; </script> </body> </html>