Perintah IF








Perintah if adalah perintah untuk membandingkan 2 buah data atau lebih. Untuk memperbandingkan data digunakan operator logika. Lihat kembali Operator Arithmatika dan Operator Logika yang terdapat pada postingan sebelumnya, sebab perintah if tidak bisa lepas dari operator ini..
Sintak :

If ( lakukan perbandingan disini )
Blok ini akan dikerjakan jika perbandingan dipenuhi.
Blok ini akan dikerjakan jika perbandingan tidak dipenuhi.

Berikut ini adalah contoh program untuk memperbandingkan 2 buah keadaan, jika umur pengguna 17 tahun kebawah, maka program akan tampil peringatan “ Maaf Anda Belum Bisa Masuk” , dan jika pengguna 17 tahun ke atas, maka program akan menampilkan “ Anda Boleh Masuk”.

<title>Contoh Fungsi if</title>
<script language=”javascript”>
var nama= prompt(“Ketik Nama Anda : “)
var umur= prompt(“Berapa Usia Anda ?”)
document.write(“Nama Anda :”+nama+”<br>”)
document.write(“Usia Anda =”+umur+”tahun<br>”)
document.write(“<h3>Anda Boleh Masuk!!</h3>”)
document.write(“Usia Anda baru :”+umur+”tahun<br>”)
document.write(“<h3>Maaf Anda Belum Bisa Masuk!!!!!!!!</h3>”)

Program akan meminta Nama Pengguna dibawah ini :

Setelah di Klik OK, maka akan muncul kembali program meminta umur pengguna :

Jika Usia lebih dari 17 ( seperti contoh penulis ) maka hasilnya akan tampak seperti gambar dibawah :

Jika Usia kurang dari 17 maka hasilnya akan tampak seperti gambar dibawah :

Password :

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