JavaScript 基础技巧(1)

 

1：基础知识
1 创建脚本块

<script language=”JavaScript”>
        JavaScript code goes here
</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: */

6 输出到浏览器

1: document.write(“<strong>Hello</strong>”);
7 定义变量

1: var myVariable 

oman';">= “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> 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>