JavaScript is an Object Oriented Programming (OOP) language.
JS是面向?qū)ο蟮木幊陶Z(yǔ)言（面向?qū)ο螅?（這里是基于對(duì)象還是面向?qū)ο蟠蠹铱梢运阉飨拢?BR>An OOP language allows you to define your own objects and make your own variable types.
OOP語(yǔ)言可以讓你自定義對(duì)象和變量類型。

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Object Oriented Programming
被安置對(duì)象的編程
JavaScript is an Object Oriented Programming (OOP) language. An OOP language allows you to define your own objects and make your own variable types.
JS是(OOP)語(yǔ)言，這就可以讓你定義....(和上面的重復(fù))
However, creating your own objects will be explained later, in the Advanced JavaScript section. We will start by looking at the built-in JavaScript objects, and how they are used. The next pages will explain each built-in JavaScript object in detail.
然而，我們將晚些在高級(jí)JS里介紹建立自定義對(duì)象。我們將開(kāi)始觀察內(nèi)建JS對(duì)象和如何使用它們。下頁(yè)將詳細(xì)介紹每個(gè)內(nèi)建JS對(duì)象
Note that an object is just a special kind of data. An object has properties and methods.
注意，對(duì)象只是特殊類型的數(shù)據(jù)。對(duì)象有屬性和方法

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Properties
屬性
Properties are the values associated with an object.
屬性是對(duì)象的相連值
In the following example we are using the length property of the String object to return the number of characters in a string:
下面的例子我么使用了字符串對(duì)象的長(zhǎng)度屬性來(lái)返回字符的數(shù)量：
<script type="text/javascript">
var txt="Hello World!"
document.write(txt.length)
</script>
The output of the code above will be:
上面的代碼就會(huì)輸出：
12

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Methods
方法
Methods are the actions that can be performed on objects.
對(duì)象的方法可以執(zhí)行行為。
In the following example we are using the toUpperCase() method of the String object to display a text in uppercase letters:
下面的例子使用了字符串對(duì)象的toUpperCase()方法來(lái)顯示出文字的大寫(xiě)：
<script type="text/javascript">
var str="Hello world!"
document.write(str.toUpperCase())
</script>
The output of the code above will be:
上面的代碼輸出：
HELLO WORLD!