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Pattern & FrameWork

MajorYe — Sat, 03 May 2008 03:58:00 GMT

1�Q�什么是模式�Q?

模式�Q�即pattern。其实就是解��x��一�c�问题的�Ҏ��论。你把解��x��c�问题的�Ҏ��ȝ��归纳到理论高度，那就是模式�?

Alexander�l�出的经典定义是�Q�每个模式都描述了一个在我们的环境中不断出现的问题，然后描述了该问题的解��x��案的核心。通过�q�种方式�Q�你可以无数�ơ地使用那些已有的解��x��案，无需在重复相同的工作�?

模式有不同的领域�Q�徏�{�领域有建筑模式�Q��Y件设计领域也有设计模式。当一个领域逐渐成熟的时候，自然会出现很多模式�?

什么是框架�Q?

框架�Q�即framework。其实就是某�U�应用的半成品，��是一�l�组�Ӟ��供你选用完成你自��q��pȝ��。简单说��是使用别�h搭好的舞収ͼ�你来做表演。而且�Q�框架一般是成熟的，不断升��的��Y件�?

2�Q��ؓ什么要用模式？

因�ؓ模式是一�U�指��|��在一个良好的指导下，有助于你完成��d��Q�有助于你作��Z��个优良的设计�Ҏ��Q�达��C��半功倍的效果。而且会得到解决问题的最佛_��法�?

��Z��么要用框�Ӟ��

因�ؓ软�g�pȝ��发展��C��天已�l�很复杂了，特别是服务器端��Y�Ӟ��设计到的知识�Q�内容，问题太多。在某些斚w��使用别�h成熟的框�Ӟ��q��当于让别人帮你完成一些基��工作�Q�你只需要集中精力完成系�l�的业务逻辑设计。而且框架一般是成熟�Q�稳健的�Q�他可以处理�pȝ��很多�l�节问题�Q�比如，事物处理�Q�安全性，数据��控制等问题。还有框架一般都�l�过很多��Z��用，所以结构很好，所以扩展性也很好�Q�而且它是不断升��的，你可以直接��n受别人升�U�代码带来的好处�?

框架一般处在低层应用��^収ͼ�如J2EE�Q�和高层业务逻辑之间的中间层�?

软�g��Z��么要分层�Q?

��Z��实现“高内聚、低耦合”。把问题划分开来各个解冻I��易于控制�Q�易于�g展，易于分配资源…��M��好处很多啦：�Q��?

3�Q�以下所�q�C��要是JAVA�Q�J2EE斚w��的模式和框架�Q?

常见的设计模式有什么？

首先�Q�你要了解的是GOF的《设计模�?-可复用面向对象��Y件的基础》一书（�q�个可以说是�E�序员必备的了）�Q�注意：GOF不是一个�h�Q�而是指四个�h。它的原意是Gangs Of Four,��是“四�h�?#8221;�Q�就是指此书的四个作者：Erich Gamma,Richard Helm�Q�Ralph Johnson,John Vlissides。这本书讲了23�U�主要的模式�Q�包括：抽象工厂、适配器、外观模式等�?

�q�有其他的很多模式，估计�?00多种�?

软�g设计模式太多�Q�就我的理解��单说一下最常见的MVC模式�?

MVC模式�?996�q�由Buschmann提出的：

模型�Q�Model�Q�：��是��装数据和所有基于对�q�些数据的操作�?

视图�Q�View�Q�：��是��装的是�Ҏ��据显�C�，即用��L��面�?

控制器（Control�Q�：��是��装外界作用于模型的操作和对数据��向的控制等�?

另外�Q?

RUP�Q�Rational Unified Process�Q��Y件统一�q�程�Q?span style="color: red">XP�Q�Extreme Programming�Q�极端编�E?/span>�Q�这些通常被叫�?#8220;�q�程�Ҏ��”�Q�是一�U��Y仉��目实施过�E�的�Ҏ��论，它是针对软�g��目的实施过�E�提出的�Ҏ��{�略。也是另一个角度的模式�?

MajorYe 2008-05-03 11:58 发表评论

MajorYe — Mon, 21 Apr 2008 04:19:00 GMT

刚吃完饭�Q�也没啥事干�Q�来写写blog�?br /> 也许��像你看到的那样�Q�我写的东西是比较偏�?br /> 先来举个例子吧：
>>> var person=function(){}
>>> person.aa="aa"
"aa"
>>> person.bb="bb"
"bb"
>>> person.cc="cc"
"cc"
上面是定义了一个person�c?br /> �l�这个类��d��了几个类属�?br /> 你单独运�?br />
>>> person.cc
"cc"
那是没问题的
但是你在�E�序中写��有问题了，
看看下面的程序：
for(var t in person){
alert(t);
alert(person.t) //��Z��么这个就有问题呢�Q�结果�ؓundefined
}
但该�?br /> for(var t in person){
alert(t);
alert(person.[t]) //�q�样��可以了
}
��Z��么呢�Q�？�Q�？

The important difference to note between these two syntaxes is that in the first, the property name is an identifier, and in the second, the property name is a string. You'll see why this is so important shortly.

In C, C++, Java, and similar strongly typed languages, an object can have only a fixed number of properties, and the names of these properties must be defined in advance. Since JavaScript is a loosely typed language, this rule does not apply: a program can create any number of properties in any object. When you use the . operator to access a property of an object, however, the name of the property is expressed as an identifier. Identifiers must be typed literally into your JavaScript program; they are not a datatype, so they cannot be manipulated by the program.

On the other hand, when you access a property of an object with the [] array notation, the name of the property is expressed as a string. Strings are JavaScript datatypes, so they can be manipulated and created while a program is running.
�q�没写完�Q�待我醒来再�l�说�Q?/p>

MajorYe 2008-04-21 12:19 发表评论

MajorYe — Fri, 18 Apr 2008 15:30:00 GMT

晚上和位不认识的朋友通话�?br /> �W�一��?br /> �q�聊的很投机�Q?br /> �W�一��?br /> 我今天晚上把头发剪短�?br /> �W�一��?br /> 两个人对金钱的看法很相像
�W�一��?br /> �q�么多第一�ơ说明了什�?br /> --------有缘
��我有缘的朋友复试成功！

MajorYe 2008-04-18 23:30 发表评论

Prototype的一些新的见�?JS)

MajorYe — Fri, 18 Apr 2008 03:25:00 GMT

对于��Z��么要使用prototype来实现��承，我就不说了，�|�上很多
下面主要是我对于prototype的一些见解：
// The constructor function initializes those properties that
// will be different for each instance.
function Rectangle(w, h) {
this.width = w;
this.height = h;
}

// The prototype object holds methods and other properties that
// should be shared by each instance.
Rectangle.prototype.area = function( ) { return this.width * this.height; }

var r = new Rectangle(2, 3);
r.hasOwnProperty("width");   // true: width is a direct property of r
r.hasOwnProperty("area");    // false: area is an inherited property of r
"area" in r;                 // true: "area" is a property of r

>>> function pp(){}
>>> pp.prototype.p="33"
"33"
>>> var t=new pp()
>>> tt.p
tt is not defined
[Break on this error] undefined
javascript: with ... (line 1)
>>> t.p
"33"
>>> t.p="44"
"44"
>>> t.p
"44"
>>> var tt=new pp()
>>> tt.p
"33"
>>> pp.prototype.constructor
pp()
>>> tt.constructor
pp()
>>> tt.prototype.constructor
tt.prototype has no properties
[Break on this error] undefined
javascript: with ... (line 1)
>>> tt.prototype.oo="22"
tt.prototype has no properties
[Break on this error] undefined
javascript: with ... (line 1)
>>> "p" in tt
true
>>> tt.hasOwnProperty
hasOwnProperty()
>>> tt.hasOwnProperty("p")
false
>>> tt.tt=0
0
>>> tt.hasOwnProperty("tt")
true
//从我的firebug调试中你能看出来吗？嘿嘿

MajorYe 2008-04-18 11:25 发表评论

08-04-18��p��学习�ȝ��

MajorYe — Fri, 18 Apr 2008 01:14:00 GMT

1: delve

delve a little into the history of how it came to be like that

delve [delv]

v. 探究, �ȝ��; �?/span>, �?/span>; 搜烦; �?/span>, �?/span>; �?/span>

2: sooner or later

3: generated

we first need to remind ourselves why XML has proved such a success and generated so much excitement.

generate [gen·er·ate || 'dʒenəreɪt]

v. 产生, ��D��, 发生

bespoke [be·spoke || bɪ'spəʊk]

adj. 预定�?/span>; 定制�?/span>

bespeak [be·speak || bɪ'spiːk]

v. 预定; 证明; 预约; 表示

5: ado

ado [a·do || ə'duː]

n. �U�h��, 骚扰; 费力, �ȝ��; 忙�ؕ; 无谓的纷�?/span>

6�Q?/span>effect

effect [ef·fect || ɪ'fekt]

n. �l�果, 效果, 影响

v. 造成; 招致; 产生; 实现, 辑ֈ�

7: bewildering

Don't worry if this example seemed a bit bewildering

bewilder [be·wil·der || bɪ'wɪldə]

v. 使迷�?/span>; 使昏�?/span>; 使不知所�?/span>

8: minimizes

This minimizes the work that needs to be done at display time and is ideal when the same displayed page is presented to very many users.

minimize (Amer.) ['min·i·mize || 'mɪnɪmaɪz]

v. ��?/span>...减到最��?/span>

9:occasionally

It's occasionally useful to have a stylesheet as the input or output of a transformation.

occasionally [oc'ca·sion·al·ly || ə'keɪʒnəlɪ]

adv. 偶尔, 间或

10: compromise

The xhtml output method, as one might expect, is a compromise between the xml and html output methods

compromise [com·pro·mise || 'kɒmprəmaɪz]

n. 妥协, 折衷�?/span>, 折衷

v. 互让解决; 攑ּ�; �q�篏, 危及; 泄露; 妥协, 让步

11: inefficient

inefficient [,inef'fi·cient || ‚ɪnɪ'fɪʃnt]

adj. 无效率的, 无能�?/span>

12: efficient

efficient [ef'fi·cient || -nt]

adj. 生效�?/span>; 能干�?/span>; 有效率的

MajorYe 2008-04-18 09:14 发表评论

毕业后，有关的档案和户口问题

MajorYe — Fri, 18 Apr 2008 00:48:00 GMT

自从从上家公司蟩槽之�?br /> 户口和档案问题一直困扰着我，
当然�Q�如果我�q�在天��|工作的话
应该是没什么问�?br /> 可我现在来到了北�?br /> 一个户口很紧张的城�?br /> 而且我又不是研究�?br /> 所以落户口是根本没希望�?br /> 但是如果�q�些落不�?br /> 那有关的五险一金怎么�?br /> 烦烦烦烦�?br /> 昨天HR和我�?br /> 公司对于你们�q�样�?br /> 有特�?br /> 也就是说什么都能上
哈哈哈哈哈哈哈哈�?br /> 开�?

MajorYe 2008-04-18 08:48 发表评论

我的�|�络相册

MajorYe — Thu, 17 Apr 2008 10:06:00 GMT

http://picasaweb.google.com/ye.zhouquan

MajorYe 2008-04-17 18:06 发表评论

MajorYe — Thu, 17 Apr 2008 10:03:00 GMT

Function()的特�D�之处有三点�Q?br /> 1�Q?nbsp;Function() constructor 它是允许js引擎动态的�ȝ��译和�q�行�Q�所以它很像全局的eval()�?br />    【注】：可别��看�q�个eval(),它可是js的一个解释器哦，嘿嘿�Q?br /> 2�Q�正因�ؓ Function() constructor 是动态的��d��建函��C��Q�因此它会比直接function定义函数要消耗资源，
      特别在��@环中不推荐��?br /> 3�Q�这点也�?nbsp;Function() constructor 最重要的一点， Function() constructor 创徏的函数是全局的，而不是相
   应得scope里面�?br />    eg:
var y = "global";
function constructFunction() {
    var y = "local";
    return new Function("return y"); // Does not capture the local scope!
}
// This line displays "global" because the function returned by the
// Function() constructor does not use the local scope. Had a function
// literal been used instead, this line would have displayed "local".
alert(constructFunction()()); // Displays "global"

MajorYe 2008-04-17 18:03 发表评论

MajorYe — Sun, 13 Apr 2008 13:58:00 GMT

�q�个周末生活比较丰富�Q�当然也没学什么东�?br /> 周六是老乡�q�来�Q�中午请他吃的饭�Q�晚上吃完饭
再送他回去�Q�周天中午请大学同学王林霞吃饭，
下午一块去打球了，然后��d��同学那打了会��d��?br /> 晚上和她那些高中同学一块吃了个饭。回来洗了个
澡，和老陈聊了会天。OVER.

MajorYe 2008-04-13 21:58 发表评论