JavaScript Window - 浏览器对象模型

浏览器对象模型 (BOM) 使 JavaScript 有能力与浏览器“对话”。

浏览器对象模型 (BOM)

浏览器对象模型（Browser Object Model）尚无正式标准。

由于现代浏览器已经（几乎）实现了 JavaScript 交互性方面的相同方法和属性，因此常被认为是 BOM 的方法和属性。

Window 对象

所有浏览器都支持 window 对象。它表示浏览器窗口。

所有 JavaScript 全局对象、函数以及变量均自动成为 window 对象的成员。

全局变量是 window 对象的属性。

全局函数是 window 对象的方法。

甚至 HTML DOM 的 document 也是 window 对象的属性之一：

window.document.getElementById("header");

与此相同：

document.getElementById("header");

Window 尺寸

有三种方法能够确定浏览器窗口的尺寸（浏览器的视口，不包括工具栏和滚动条）。

对于Internet Explorer、Chrome、Firefox、Opera 以及 Safari：
window.innerHeight - 浏览器窗口的内部高度
window.innerWidth - 浏览器窗口的内部宽度

对于 Internet Explorer 8、7、6、5：
document.documentElement.clientHeight
document.documentElement.clientWidth

或者
document.body.clientHeight
document.body.clientWidth

实用的 JavaScript 方案（涵盖所有浏览器）：

实例

var w=window.innerWidth
|| document.documentElement.clientWidth
|| document.body.clientWidth;

var h=window.innerHeight
|| document.documentElement.clientHeight
|| document.body.clientHeight;

亲自试一试

该例显示浏览器窗口的高度和宽度：（不包括工具栏/滚动条）

其他 Window 方法

一些其他方法：
window.open() - 打开新窗口
window.close() - 关闭当前窗口
window.moveTo() - 移动当前窗口
window.resizeTo() - 调整当前窗口的尺寸
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