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windows

get the inner size of browser:
windows.innerWidth
windows.innerHeight

get the global size of browser:
windows.outerWidth
windows.outerHeight

get information of browser
navigator.appName:浏览器名称;
navigator.appVersion:浏览器版本;
navigator.language:浏览器设置的语言;
navigator.platform:操作系统类型;
navigator.userAgent:浏览器设定的User-Agent字符串。

screen

use screen to get screen information:
screen.width:
screen.height:
screen.colorDepth:

location

for a url=http://www.example.com:8080/path/index.html?a=1&b=2#TOP

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location.href : get the current url;  
location.protocol; // 'http'
location.host; // 'www.example.com'
location.port; // '8080'
location.pathname; // '/path/index.html'
location.search; // '?a=1&b=2'
location.hash; // 'TOP'

加载一个新页面,可以调用location.assign()。如果要重新加载当前页面,调用location.reload()方法非常方便

document

document对象表示当前页面。由于HTML在浏览器中以DOM形式表示为树形结构,document对象就是整个DOM树的根节点
document的title属性是从HTML文档中的xxx读取的,但是可以动态改变:

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document.title = '努力学习JavaScript!';

用document对象提供的getElementById()和getElementsByTagName()可以按ID获得一个DOM节点和按Tag名称获得一组DOM节点