[翻译]High Performance JavaScript(005)
第二章 Data Access 数据访问
One of the classic computer science problems is determining where data should be stored for optimal reading and writing. Where data is stored is related to how quickly it can be retrieved during code execution. This problem in JavaScript is somewhat simplified because of the small number of options for data storage. Similar to other languages, though, where data is stored can greatly affect how quickly it can be accessed later. There are four basic places from which data can be accessed in JavaScript:
经典计算机科学的一个问题是确定数据应当存放在什么地方，以实现最佳的读写效率。数据存储在哪里，关系到代码运行期间数据被检索到的速度。在JavaScript中，此问题相对简单，因为数据存储只有少量方式可供选择。正如其他语言那样，数据存储位置关系到访问速度。在JavaScript中有四种基本的数据访问位置：
Literal values 直接量
Any value that represents just itself and isn't stored in a particular location. JavaScript can represent strings, numbers, Booleans, objects, arrays, functions, regular expressions, and the special values null and undefined as literals.
直接量仅仅代表自己，而不存储于特定位置。 JavaScript的直接量包括：字符串，数字，布尔值，对象，数组，函数，正则表达式，具有特殊意义的空值，以及未定义。
Variables 变量
Any developer-defined location for storing data created by using the var keyword.
开发人员使用var关键字创建用于存储数据值。
Array items 数组项
A numerically indexed location within a JavaScript Array object.
具有数字索引，存储一个JavaScript数组对象。
Object members 对象成员
A string-indexed location within a JavaScript object.
具有字符串索引，存储一个JavaScript对象。
Each of these data storage locations has a particular cost associated with reading and writing operations involving the data. In most cases, the performance difference between accessing information from a literal value versus a local variable is trivial. Accessing info
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上面所说有关HTML的内容非常少又简单,但对已经了解的人来说就是没用的.
如有问题可到权威网 http://www.html.com/ 上查看
以下开始说说关于XML的一些知识.
XML也是标记语言,可它是自定义的,没有已给定格式.不具体说它,给出例子就可明了.
如
<NAME>TOM</NAME>
<SEX>M</SEX>
以上内容的< ......
javascript中event.keycode
keycode 8 = BackSpace BackSpace
keycode 9 = Tab Tab
keycode 12 = Clear
keycode 13 = Enter
keycode 16 = Shift_L
keycode 17 = Control_L
keycode 18 = Alt_L
keycode 19 = Pause
keycode 20 = Caps_Lock
keycode 27 = Escape Escape
keycode 32 = space space ......
C#代码与javaScript函数的相互调用
问：
1.如何在JavaScript访问C#函数?
2.如何在JavaScript访问C#变量?
3.如何在C#中访问JavaScript的已有变量?
4.如何在C#中访问JavaScript函数?
问题1答案如下：
javaScript函数中执行C#代码中的函数：
方法一：1、首先建立一个按钮，在后台将调用或处理的内容写入button_click中 ......
类是什么？
许多刚接触编程的朋友都可能理解不了类，其实类是对我们这个现实世界的模拟，把它说成“类别”或者“类型”可能会更容易理解一些。比如“人”这种动
物就是一个类，而具体某一个人就是“人”这个类的一个实例
，
“� ......
XMLHttpRequest Script Injection XHR脚本注入
Another approach to nonblocking scripts is to retrieve the JavaScript code using an XMLHttpRequest (XHR) object and then inject the script into the page. This technique involves creating an XHR object, downloading the JavaScript f ......
