L6 javascript
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8/2/2010
Bài 6.
JavaScript
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trang Web
2
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± +70/;+70/OjFiFÿӏQKGҥQJWjLOLӋXFyWKӇ
ÿѭӧFVӱGөQJÿӇWUDRÿәLGӳOLӋXWUrQPҥQJ
Internet
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ÿӝFÿiRÿӇKҩSGүQQJѭӡLVӱGөQJ
±
4
2
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*LӟLWKLӋXYӅ-DYD6FULSW
JavaScript = Java + Script?
Script?
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± &iFQJ{QQJӳNӏFKEҧQWKѭӡQJÿѭӧFWK{QJGӏFK
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± 0m-DYD6FULSWFyWKӇQK~QJWURQJWjLOLӋX+70/
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phía Client và Server.
6
3
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&XQJFҩSVӵWѭѫQJWiFYӟLQJѭӡLGQJ
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8
4
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3. Chèn mã JavaScript vào Web Page
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Cú pháp
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</script>
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5
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<html>
<head>
<script language="javascript">
document.write("Welcome to
JavaScript");
</script>
</head>
<body>
</body>
</html>
11
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12
6
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Cú pháp
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</script>
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HTML file: external.html
<html>
<head>
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VUF ³WHVWMV´!
</script>
</head>
<body>
</body>
</html>
JavaScript file: test.js
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15
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So sánh
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8
8/2/2010
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4.3. Phép toán
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4.6. Chú thích
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4.8. Hàm
17
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± 7rQFyWKӇFKӭDVӕ
± -DYD6FULSWSKkQELӋWFKӳKRDYjFKӳWKѭӡQJ
18
9
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± Cú pháp: YDUWrQBELӃQ
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var A=10;
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var A;
A =10;
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± ĈѭӧF[iFÿӏQKEӣLQѫLELӃQÿѭӧFNKDLEiR
Script
Global variable
Function 1
Local variable
Function 2
Local varibale
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± Khai báo bên ngoài hàm
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Numbers
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Logical or Boolean
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Strings
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nulll
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22
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var x = 10;
x = true;
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Hàm
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24
12
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.LӇXGӳOLӋX
<script language="javascript">
var x = 10;
document.write(x);
x=true;
x = "Hello World";
document.write(x);
x = "12"+4.3;
document.write(x);
x = parseInt("-32");
document.write(x);
</script>
25
.LӇXGӳOLӋX
26
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4.3. Phép toán
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4.3.2. Phép toán so sánh
4.3.3. Phép toán logic
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27
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Phép toán
Mô Wҥ
+
&ӛQJ
7Uӭ
/
Chia
%
6ӓ GѬ
++
7ăQJ 1
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ĈҥR GҧX
Ví Gӧ
A = 5 + 8
A = 8 ± 5
A = 20 / 5
10 % 3 = 1
++ x và x ++
-- x và x -QӁX A = 5
thì ±A = -5
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4.3.2. Phép toán so sánh
Phép
toán
= =
Mô WҥVRViQK
Ví Gӧ [
.ӁW TXҥ
%ҳQJJLi WUӍ
x = = 5
= = = %ҳQJJLiWUӍYj
NLӅX
x =
true
³´ false
! =
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x ! = 4
true
>
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x > 5
false
>=
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x >= 5
true
<
1Kӑ KѪQ
x < 4
false
<=
1Kӑ KѪQKRҹFEҳQJ
x <=5
true
29
4.3.3. Phép toán logic
Phép
toán
&&
||
!
Mô Wҥ
And
Or
Not
Ví Gӧ
(x=6, y=3)
(x<10)&& (y>1)
(x<1)|| (y>5)
!(x==y)
.ӁW TXҥ
true
false
true
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4.3.3. Phép toán logic
<script language="javascript">
var x=10;
var y=5;
document.write("x And y= "+(x&&y));
document.write("
");
document.write("x Or y="+(x||y));
document.write("
");
document.write("Not x ="+(!x));
</script>
31
4.3.3. Phép toán logic
32
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3KpSWRiQÿӏQKOѭӧQJ
3KpSWRiQÿLӅXNLӋQ
Cú pháp
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VWDWXV GLHP!
"³ÿҥW´ ³WKLOҥL´
33
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typeof
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9tGө
var x = 5;
document.write(typeof(x));
=> number
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ÿy
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± %LӇXWKӭFORJLF
± %LӇXWKӭF[kX
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prompt
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