JavaScript 基础入门：脚本嵌入、字符串处理与函数定义

JavaScript 基础与 HTML 嵌入

基础知识：HTML

JavaScript 就这么回事1：基础知识

1 创建脚本块

1: <script language="JavaScript">

2: JavaScript code goes here

3: </script>

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

3 浏览器不支持的时候显示

1: <noscript>

2: Hello to the non-JavaScript browser.

3: </noscript>

4 链接外部脚本文件

1: <script language="JavaScript" 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: */

字符串处理与格式化

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>

10 字符串替换

1: thisVar.replace("Monday","Friday");

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>

数组操作与字符串分割

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>

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>

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>

用户交互与函数应用

15 弹出警告信息

1: <script language="JavaScript">

2: <!--

3: window.alert("Hello");

4: // -->

5: </script>

16 弹出确认框

1: <script language="JavaScript">

2: <!--

3: var result = window.confirm("Click OK to continue");

4: // -->

5: </script>

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>

18 调用JS函数

1: <a href="#" onClick="functionName()">Link text</a>

2: <a href="/"javascript:functionName"()">Link text</a>

19 在页面加载完成后执行函数

1: <body onLoad="functionName();">

2: Body of the page

3: </body>

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>