1
<
script language
=
”JavaScript”
>
2
JavaScript code goes here
3
</
script
>

2

3

2 隐藏脚本代码
1
<
script language
=
”JavaScript”
>
2
<!--
3
document.write(“Hello”);
4
//
-->
5
</
script
>
在不支持JavaScript的浏览器中将不执行相关代码

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3

4

5

3 浏览器不支持的时候显示
1
<
noscript
>
2
Hello to the non
-
JavaScript browser.
3
</
noscript
>

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3

4 链接外部脚本文件
1
<
script language
=
”JavaScript” src
=
"
/”filename.js
"
”
></
script
>


5 注释脚本
1
2
//
This is a comment
3
document.write(“Hello”);
//
This is a comment
4
/**/
/*
5
All of this
6
is a comment
7
*/

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3

4


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6

7

6 输出到浏览器
1
document.write(“
<
strong
>
Hello
</
strong
>
”);

7 定义变量
1
var
myVariable
=
“some value”;

8 字符串相加
1
var
myString
=
“String1”
+
“String2”;


9 字符串搜索
1
<
script language
=
”JavaScript”
>
2
<!--
3
var
myVariable
=
“Hello there”;
4
var
therePlace
=
myVariable.search(“there”);
5
document.write(therePlace);
6
//
-->
7
</
script
>

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3

4

5

6

7


10 字符串替换


11 格式化字串
1
<
script language
=
”JavaScript”
>
2
<!--
3
var
myVariable
=
“Hello there”;
4
document.write(myVariable.big()
+
“
<
br
>
”);
5
document.write(myVariable.blink()
+
“
<
br
>
”);
6
document.write(myVariable.bold()
+
“
<
br
>
”);
7
document.write(myVariable.fixed()
+
“
<
br
>
”);
8
document.write(myVariable.fontcolor(“red”)
+
“
<
br
>
”);
9
document.write(myVariable.fontsize(“18pt”)
+
“
<
br
>
”);
10
document.write(myVariable.italics()
+
“
<
br
>
”);
11
document.write(myVariable.small()
+
“
<
br
>
”);
12
document.write(myVariable.strike()
+
“
<
br
>
”);
13
document.write(myVariable.sub()
+
“
<
br
>
”);
14
document.write(myVariable.sup()
+
“
<
br
>
”);
15
document.write(myVariable.toLowerCase()
+
“
<
br
>
”);
16
document.write(myVariable.toUpperCase()
+
“
<
br
>
”);
17
18
var
firstString
=
“My String”;
19
var
finalString
=
firstString.bold().toLowerCase().fontcolor(“red”);
20
//
-->
21
</
script
>

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3

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7

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10

11

12

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14

15

16

17

18

19

20

21

12 创建数组
1
<
script language
=
”JavaScript”
>
2
<!--
3
var
myArray
=
new
Array(
5
);
4
myArray[
0
]
=
“First Entry”;
5
myArray[
1
]
=
“Second Entry”;
6
myArray[
2
]
=
“Third Entry”;
7
myArray[
3
]
=
“Fourth Entry”;
8
myArray[
4
]
=
“Fifth Entry”;
9
var
anotherArray
=
new
Array(“First Entry”,”Second Entry”,”Third Entry”,”Fourth Entry”,”Fifth Entry”);
10
//
-->
11
</
script
>

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3

4

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6

7

8

9

10

11

13 数组排序
1
<
script language
=
”JavaScript”
>
2
<!--
3
var
myArray
=
new
Array(
5
);
4
myArray[
0
]
=
“z”;
5
myArray[
1
]
=
“c”;
6
myArray[
2
]
=
“d”;
7
myArray[
3
]
=
“a”;
8
myArray[
4
]
=
“q”;
9
document.write(myArray.sort());
10
//
-->
11
</
script
>

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3

4

5

6

7

8

9

10

11

14 分割字符串
1
<
script language
=
”JavaScript”
>
2
<!--
3
var
myVariable
=
“a,b,c,d”;
4
var
stringArray
=
myVariable.split(“,”);
5
document.write(stringArray[
0
]);
6
document.write(stringArray[
1
]);
7
document.write(stringArray[
2
]);
8
document.write(stringArray[
3
]);
9
//
-->
10
</
script
>

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3

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5

6

7

8

9

10

15 弹出警告信息
1
<
script language
=
”JavaScript”
>
2
<!--
3
window.alert(“Hello”);
4
//
-->
5
</
script
>

2

3

4

5

16 弹出确认框
1
<
script language
=
”JavaScript”
>
2
<!--
3
var
result
=
window.confirm(“Click OK to
continue
”);
4
//
-->
5
</
script
>

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3

4

5

17 定义函数
1
<
script language
=
”JavaScript”
>
2
<!--
3
function
multiple(number1,number2)
{
4
var result = number1 * number2;
5
return result;
6
}
7
//
-->
8
</
script
>

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3



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5

6

7

8

18 调用JS函数
1
<
a href
=
”#” onClick
=
”functionName()”
>
Link text
</
a
>
2
<
a href
=
"
/”javascript:functionName
"
()”
>
Link text
</
a
>

2

19 在页面加载完成后执行函数
1
<
body onLoad
=
”functionName();”
>
2
Body of the page
3
</
body
>

2

3

20 条件判断
1
<
script
>
2
<!--
3
var
userChoice
=
window.confirm(“Choose OK or Cancel”);
4
var
result
=
(userChoice
==
true
)
?
“OK” : “Cancel”;
5
document.write(result);
6
//
-->
7
</
script
>

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3

4

5

6

7

21 指定次数循环
1
<
script
>
2
<!--
3
var
myArray
=
new
Array(
3
);
4
myArray[
0
]
=
“Item
0
”;
5
myArray[
1
]
=
“Item
1
”;
6
myArray[
2
]
=
“Item
2
”;
7
for
(i
=
0
; i
<
myArray.length; i
++
)
{
8
document.write(myArray[i] + “<br>”);
9
}
10
//
-->
11
</
script
>
12

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3

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5

6

7



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10

11

12

22 设定将来执行
1
<
script
>
2
<!--
3
function
hello()
{
4
window.alert(“Hello”);
5
}
6
window.setTimeout(“hello()”,
5000
);
7
//
-->
8
</
script
>
9

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3



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5

6

7

8

9

23 定时执行函数
1
<
script
>
2
<!--
3
function
hello()
{
4
window.alert(“Hello”);
5
window.setTimeout(“hello()”,5000);
6
}
7
window.setTimeout(“hello()”,
5000
);
8
//
-->
9
</
script
>

2

3



4

5

6

7

8

9

24 取消定时执行
1
<
script
>
2
<!--
3
function
hello()
{
4
window.alert(“Hello”);
5
}
6
var
myTimeout
=
window.setTimeout(“hello()”,
5000
);
7
window.clearTimeout(myTimeout);
8
//
-->
9
</
script
>

2

3



4

5

6

7

8

9

25 在页面卸载时候执行函数
1
<
body onUnload
=
”functionName();”
>
2
Body of the page
3
</
body
>
4

2

3

4
