开发环境：webstorm 6.0
基础铺垫：Web 2.0，XHTML和CSS
javacript的重要作用：
1. 基于web的应用程序的标准客户端脚本语言
2. 服务器端的脚本基础
程序调试前准备： 修改IE的Internet选项—安全-允许本地运行活动的内容
高级-浏览-显示脚本错误的提示
Netscape和Microsoft构建Javacript标准
ch4_1.html
<!DOCTYPE html> <html> <head> <title>First Program in Javascript</title> <script type = "text/javascript"> <!-- document.writeln("<h1>Welcome to Javascript Programming!</h1>"); //--> </script> </head> <body> </body> </html>
<script type = "text/javascript">
<!--
被封装的代码
如果浏览器支持，就执行；否则识别为注释
//-->
</script>
Javascirpt中的字符串可以封装在双引号或单引号中
每条语句添加分号隔开
对大小写敏感
ch4_2.xhtml
<!DOCTYPE html>
<html>
<head>
<title>Pringting a Line with Multiple statements</title>
<script type="text/javascript">
<!--
document.write("<h1 style = "color: magenta">");
document.write("Welcome to Javascript " + "Programming!</h1>");
//-->
</script>
</head>
<body></body>
</html>
ch4_3.html
<!DOCTYPE html> <html> <head> <title>Pringting Multiple Lines</title> <script type="text/javascript"> <!-- document.writeln("<h1>Welcome to <br/> javascript<br/>" + "Programming</h1>"); //--> </script> </head> <body></body> </html>
ch4_4.html
<!DOCTYPE html> <html> <head> <title>Pringting Multiple Lines</title> <script type="text/javascript"> <!-- window.alert("Welcome to Javascript Programming!"); //--> </script> </head> <body> <p>please refresh or reload this script again!</p> </body> </html>
ch4_5.html
<!DOCTYPE html> <html> <head> <title>Pringting Multiple Lines</title> <script type="text/javascript"> <!-- var name; name = window.prompt("Please enter your name"); document.writeln("<h1>Hello, " + name + ", welcome to javascript programming!</h1>"); //--> </script> </head> <body> <p>please refresh or reload this script again!</p> </body> </html>