JS入门代码2009/04/21 13:59JS入门代码

适合阅读范围：对java script一无所知～离精通只差一步之遥的人
基础知识：HTML

java script就这么回事1：基础知识??

1 创建脚本块??

1: <script language=”java script”>??
2: java script code goes here??
3: </script>??

2 隐藏脚本代码??

1: <script language=”java script”>??
2: <!--??
3: document.write(“Hello”);??
4: // -->??
5: </script>??

在不支持java script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: Hello to the non-java script browser.??
3: </noscript>??

4 链接外部脚本文件??

1: <script language=”java script” src="/”filename.js"”></script>??

5 注释脚本??

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

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=”java script”>??
2: <!--??
3: var myVariable = “Hello there”;??
4: var therePlace = myVariable.search(“there”);??
5: document.write(therePlace);??
6: // -->??
7: </script>??

10 字符串替换??

1: thisVar.replace(“Monday”,”Friday”);??

11 格式化字串??

1: <script language=”java script”>??
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>??

12 创建数组??

1: <script language=”java script”>??
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>??

13 数组排序??

1: <script language=”java script”>??
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: <script language=”java script”>??
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: <script language=”java script”>??
2: <!--??
3: window.alert(“Hello”);??
4: // -->??
5: </s