javascript document对象详解(常用)
代表给定浏览器窗口中的 HTML 文档
常用属性：
document.body //直接访问body元素。指定文档主体的开始和结束。(下面详细介绍body子对象)
document.cookie //设置或返回和文档相关联的所有cookies。
document.domain //设置或返回文档的安全域名。
document.referrer // 返回加载或引入当前文档的那个文档的URL。
document.title //设置或返回文档的标题title，等价于HTML的<title>标签
document.url //返回文档的URL。
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document.lastModified //返回文档最后一次修改的日期和时间。
document.bgColor //设置页面背景色。
document.fgColor //设置前景色(文本颜色)
document.linkColor //未点击过的链接颜色。
document.alinkColor //激活链接(焦点在此链接上)的颜色。
document.vlinkColor //已点击过的链接颜色。
fileCreatedDate //文件建立日期，只读属性
fileModifiedDate //文件修改日期，只读属性。
document.fileSize //文件大小，只读属性
document.charset //设置字符集 如简体中文为"gb2312"
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Body 子对象：
document.body.bgColor //设置或获取对象的背景颜色
document.body.link //未点击过的链接颜色
document.body.text //文本颜色
document.body.innerText //设置<body>…</body>之间的文本
document.body.topMargin //页面上边距
document.body.leftMargin //页面左边距
document.body.rightMargin //页面右边距
document.body.bottomMargin //页面下边距
document.body.background //设置或返回背景图片
document.body.appendChild(oTag) //动态生成一个HTML对象
常用对象事件
document.body.onclick="func()" //鼠标指针单击对象是触发
document.body.onmouseover="func()" //鼠标指针移到对象时触发
document.body.onmouseout="func()" //鼠标指针移出对象时触发
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常用对象方法：
open() //打开一个输出流以显示通过任何document.write() 或 document.writeln()方法产生的输出。
close() //关闭由document.open()打开的输出流。
document.write() 将HTML表达式或JavaScript代码动态写入一个文档。
writeln() //writeln()方法和write()方法一样，只不过另外增加了在每一个表达式后面写入一行新字符的功能。
document.createElement(Tag) //创建一个html标签对象。
document.getElementById(ID) // 获取指定ID的对象
document.getElementsByName() //获取指定name值的对象
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Document 对象集合：
anchors[] //返回文档中所有的锚anchors组成的数组。
forms[] // 返回文档中所有的表单forms组成的数组。
images[] //返回文档中所有的图像images组成的数组。
links[] //返回文档中所有的链接links组成的数组。
document.all //document中所有对象的集合。只有ie支持此属性，因此也用来判断浏览器的种类
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location位置子对象document.location.hash // #号后的部分
document.location.host // 域名+端口号
document.location.hostname // 域名
document.location.href // 完整URL
document.location.pathname // 目录部分
document.location.port // 端口号
document.location.protocol // 网络协议(http:)
document.location.search // ?号后的部分
documeny.location.reload() //刷新网页
document.location.reload(URL) //打开新的网页
document.location.assign(URL) //打开新的网页
document.location.replace(URL) //打开新的网页
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selection-选区子对象
document.selection
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