Javascript入门（可供CSS/JS/XSS初学者参考）

JavaScript作用小结：
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: */  
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: docume