1创建脚本块
1 < scriptlanguage = ”JavaScript” >
2 JavaScriptcodegoeshere
 3 </ script >

2隐藏脚本代码
1 < scriptlanguage = ”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

3浏览器不支持的时候显示
1 < noscript >
2 Hellotothenon - JavaScriptbrowser.
 3 </ noscript >

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

5注释脚本
1
2 // Thisisacomment
3 document.write(“Hello”); // Thisisacomment
4 /**/ /*
5 Allofthis isacomment
7*/

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

7定义变量
1 var myVariable = “somevalue”;

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

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

10字符串替换
thisVar.replace(“Monday”,”Friday”);

11格式化字串
1 < scriptlanguage = ”JavaScript” >
2 <!--
3 var myVariable = “Hellothere”;
 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 = “MyString”;
 19 var finalString = firstString.bold().toLowerCase().fontcolor(“red”);
 20 // -->
21 </ script >

12创建数组
1 < scriptlanguage = ”JavaScript” >
2 <!--
3 var myArray = new Array( 5 );
 4 myArray[ 0 ] = “FirstEntry”;
 5 myArray[ 1 ] = “SecondEntry”;
 6 myArray[ 2 ] = “ThirdEntry”;
 7 myArray[ 3 ] = “FourthEntry”;
 8 myArray[ 4 ] = “FifthEntry”;
 9 var anotherArray = new Array(“FirstEntry”,”SecondEntry”,”ThirdEntry”,”FourthEntry”,”FifthEntry”);
 10 // -->
11 </ script >

13数组排序
1 < scriptlanguage = ”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 >

14分割字符串
1 < scriptlanguage = ”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 >

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

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

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

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

19在页面加载完成后执行函数
1 < bodyonLoad = ”functionName();” >
2 Bodyofthepage
 3 </ body >

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

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 ++ ) {
8document.write(myArray[i]+“<br>”);
9}
10 // -->
11 </ script >
12

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

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 >

25在页面卸载时候执行函数
1 < bodyonUnload = ”functionName();” >
2 Bodyofthepage
 3 </ body >
4