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联系地址：北京北京朝阳区建国门外大街 1 号From Wikipedia, the free encyclopedia
This article has multiple issues. Please help
or discuss these issues on the . ()
This article needs attention from an expert on the subject. Please add a reason or a talk parameter to this template to explain the issue with the article. Consider
with a . (January 2015)
This article's factual accuracy is . Relevant discussion may be found on the . Please help to ensure that disputed statements are . (March 2012) ()
This article may be
to readers. Please help us . There might be a discussion about this on the . (October 2009) ()
Dynamic programming language, in , is a class of
which, at , execute many common programming behaviors that static programming languages perform during . These behaviors could include extension of the program, by adding new , by extending
and definitions, or by modifying the . Although similar behaviours can be emulated in nearly any language, with varying degrees of difficulty, complexity and performance costs, dynamic languages provide direct tools to make use of them. Many of these features were first implemented as native features in the
programming language.
Most dynamic languages are also , but not all are. Dynamic languages are frequently (but not always) referred to as "", although the term "scripting language" in its narrowest sense refers to languages specific to a given run-time environment.
This section needs expansion. You can help by . (October 2009)
Some dynamic languages offer an
function. This function takes a string parameter containing code in the language, and executes it. If this code stands for an expression, the resulting value is returned. However,
and Peter Drayton suggest that programmers "use eval as a poor man's substitute for ."
A type or object system can typically be modified during runtime in a dynamic language. This can mean generating new objects from a runtime definition or based on
of existing types or objects. This can also refer to changing the
or type tree, and thus altering the way that existing types behave (especially with respect to the invocation of ).
concepts are a feature of many dynamic languages, and also derive from Lisp.
One of the most widely used aspects of functional programming in dynamic languages is the , which allows creating a new instance of a function which retains access to the context in which it was created. A simple example of this is generating a function for scanning text for a word:
function new_scanner (word)
temp_function = function (input)
scan_for_text (input, word)
end function
return temp_function
end function
Note that the inner function has no name, and is instead stored in the variable temp_function. Each time new_scanner is executed, it will return a new function which remembers the value of the word parameter that was passed in when it was defined.
Closures are one of the core tools of functional programming, and many languages support at least this degree of functional programming.
Another feature of some dynamic languages is the . Continuations represent execution states that can be re-invoked. For example, a parser might return an intermediate result and a continuation that, when invoked, will continue to parse the input. Continuations interact in very complex ways with scoping, especially with respect to closures. For this reason, many dynamic languages do not provide continuations.
is common in many dynamic languages, and typically involves
of the types and metadata of generic or
data. It can, however, also include full evaluation and modification of a program's code as data, such as the features that Lisp provides in analyzing .
A limited number of dynamic programming languages provide features which combine
(the ability to examine classes, functions and keywords to know what they are, what they do and what they know) and eval in a feature called . Most programmers today who are aware of the term macro have encountered them in
or , where they are a static feature which are built in a small subset of the language, and are capable only of string substitutions on the text of the program. In dynamic languages, however, they provide access to the inner workings of the compiler, and full access to the interpreter, virtual machine, or runtime, allowing the definition of language-like constructs which can optimize code or modify the syntax or grammar of the language.
, , , early , and
do not generally fit into this category.[]
The following examples show dynamic features using the language
The example shows how a function can be modified at runtime from computed source code
; the source code is stored as data in a variable
CL-USER & (defparameter *best-guess-formula* '(lambda (x) (* x x 2.5)))
*BEST-GUESS-FORMULA*
; a function is created from the code and compiled at runtime, the function is available under the name best-guess
(compile 'best-guess *best-guess-formula*)
#&Function 15 &
; the function can be called
CL-USER & (best-guess 10.3)
; the source code might be improved at runtime
CL-USER & (setf *best-guess-formula* `(lambda (x) ,(list 'sqrt (third *best-guess-formula*))))
(LAMBDA (X) (SQRT (* X X 2.5)))
; a new version of the function is being compiled
CL-USER & (compile 'best-guess *best-guess-formula*)
#&Function 16 C&
; the next call will call the new function, a feature of late binding
CL-USER & (best-guess 10.3)
This example shows how an existing instance can be changed to include a new slot when its class changes and that an existing method can be replaced with a new version.
; a person class. The person has a name.
CL-USER & (defclass person () ((name :initarg :name)))
#&STANDARD-CLASS PERSON &
; a custom printing method for the objects of class person
CL-USER & (defmethod print-object ((p person) stream)
(print-unreadable-object (p stream :type t)
(format stream "~a" (slot-value p 'name))))
#&STANDARD-METHOD PRINT-OBJECT NIL (PERSON T) B&
; one example person instance
CL-USER & (setf *person-1* (make-instance 'person :name "Eva Luator"))
#&PERSON Eva Luator&
; the class person gets a second slot. It then has the slots name and age.
CL-USER & (defclass person () ((name :initarg :name) (age :initarg :age :initform :unknown)))
#&STANDARD-CLASS PERSON &
; updating the method to print the object
CL-USER & (defmethod print-object ((p person) stream)
(print-unreadable-object (p stream :type t)
(format stream "~a age: ~" (slot-value p 'name) (slot-value p 'age))))
#&STANDARD-METHOD PRINT-OBJECT NIL (PERSON T) 402022ADE3&
; the existing object has now changed, it has an additional slot and a new print method
CL-USER & *person-1*
#&PERSON Eva Luator age: UNKNOWN&
; we can set the new age slot of instance
CL-USER & (setf (slot-value *person-1* 'age) 25)
; the object has been updated
CL-USER & *person-1*
#&PERSON Eva Luator age: 25&
In the next example the class person gets a new superclass. The print method gets redefined such that it assembles several methods into the effective method. The effective method gets assembled based on the class of the argument and the at runtime available and applicable methods.
; the class person
CL-USER & (defclass person () ((name :initarg :name)))
#&STANDARD-CLASS PERSON &
; a person just prints its name
CL-USER & (defmethod print-object ((p person) stream)
(print-unreadable-object (p stream :type t)
(format stream "~a" (slot-value p 'name))))
#&STANDARD-METHOD PRINT-OBJECT NIL (PERSON T) AB&
; a person instance
CL-USER & (defparameter *person-1* (make-instance 'person :name "Eva Luator"))
*PERSON-1*
; displaying a person instance
CL-USER & *person-1*
#&PERSON Eva Luator&
; now redefining the print method to be extensible
; the around method creates the context for the print method and it calls the next method
CL-USER & (defmethod print-object :around ((p person) stream)
(print-unreadable-object (p stream :type t)
(call-next-method)))
#&STANDARD-METHOD PRINT-OBJECT (:AROUND) (PERSON T) &
; the primary method prints the name
CL-USER & (defmethod print-object ((p person) stream)
(format stream "~a" (slot-value p 'name)))
#&STANDARD-METHOD PRINT-OBJECT NIL (PERSON T) BB&
; a new class id-mixin provides an id
CL-USER & (defclass id-mixin () ((id :initarg :id)))
#&STANDARD-CLASS ID-MIXIN AB&
; the print method just prints the value of the id slot
CL-USER & (defmethod print-object :after ((object id-mixin) stream)
(format stream " ID: ~a" (slot-value object 'id)))
#&STANDARD-METHOD PRINT-OBJECT (:AFTER) (ID-MIXIN T) &
; now we redefine the class person to include the mixin id-mixin
CL-USER 241 & (defclass person (id-mixin) ((name :initarg :name)))
#&STANDARD-CLASS PERSON &
; the existing instance *person-1* now has a new slot and we set it to 42
CL-USER 242 & (setf (slot-value *person-1* 'id) 42)
; displaying the object again. The print-object function now has an effective method, which calls three methods: an around method, the primary method and the after method.
CL-USER 243 & *person-1*
#&PERSON Eva Luator ID: 42&
Popular dynamic programming languages include , , , ,
and . The following are generally considered dynamic languages:
Cobolscript
and most other
and Peter Drayton (2005), Static Typing Where Possible, Dynamic Typing When Needed: The End of the Cold War Between Programming Languages,
Corporation,  
See example of use on p.330 of 's
. Static.springsource.org. Retrieved on .
(Many use the term "scripting languages".)
— 2003 study
by Dr. Nikolai Bezroukov
transcript of his State of the Onion speech.
— JavaWorld
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云南河口是云南热带水果的主要种植地区之一，这款小菠萝，果肉金黄，蜜香甘甜，吃起来清脆多汁，鲜嫩无渣。云南小菠萝主要以小而闻名，虽然个头小，但吃起来很甜。需要说明的是，考虑到运输时效等问题，这款小菠萝发货是是青的，可以放熟再吃。
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扫一下，分享更方便，购买更轻松迷你按钮开关一般多少钱？
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迷你按钮开关一般多少钱？
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迷你按钮开关一般的价格在5元左右。
迷你按钮开关是指利用按钮推动传动机构，使动触点与静触点按通或断开并实现电路换接的开关。按钮开关是一种结构简单，应用十分广泛的主令电器。在电气自动控制电路中，用于手动发出控制信号以控制接触器、继电器、电磁起动器等。以上价格来源于网络，仅供参考
迷你按钮开关价格如下：
西门子开关5 UB
品牌： 西门子
欧普照明遥控开关OP-YZ36D/55D
品牌： 欧普照明
TCL开关HE31/1/2BY
希望我的回答可以帮到你，以上价格来源于网络，仅供参考。
六钧迷你按钮开关价格? 1.20，此颗按键开关采用滚珠原理设计，能使银接点更迅速分离，有效减少拉弧产生。
价格来源网络，仅供参考。
-丶-&回答：1.按钮开关箱
品牌/型号：双科/LA160-11X2|品牌：双科|型号：LA160-11X2
产品认证：CCC
报价:95.50元
2.按钮开关箱
品牌/型号：GQELE/LA115-B8-11X|品牌：GQELE|型号：LA115-B8-11X
加工定制：是|产品认证：CCC|
报价:99.80元
以上报价来源于网络，仅供参考以实际购买为准。
自命非凡&回答：温州经济技术开发区沙城铭烨电器厂的按钮开关，报价：5元。
温州康家电气有限公司的按钮开关，报价：2.9元。
温州市龙湾天河爱佳电器厂的按钮开关，报价：7.8元。
以上价格来源于网络，仅供参考。
xiaoguiMF&回答：你好，下面是我了解到的该产品的价格，你可以对比参考一下：
型号：IDEC
报价:4.50元
型号：正启FJ-14
报价:2.88元
型号：Fuji富士AR9E760
报价:12.00元
以上价格来源网络，具体以实际购买时为准，仅供参考。
言尔无心&回答：乐清市虹桥骄阳电子厂多功能按钮开关DS-427 价格是0.55元。
温州市鹿城区黎明文策电子配件厂DS-114多功能按钮开关价格是1.75元。
深圳市晟鑫怡电子有限公司供应的多功能按钮开关日本三山，价格是8元。
以上价格来源于网络，仅供参考
倒叙_7629&回答：引进互锁按钮开关BS315B，26.5元，BS315B按钮开关适用于交流50HZ右60HZ，电压至380V及直流电压至220V，额定电流至17A的电力系统中直接通断单台电机和电磁动器、接触器、继电器及其它电气线路中，作遥远控制之用。
恒民电器BS230B价格是4.2元，BS系列押扣开关为防护式结构，外壳为钢板拉伸成型加工而成，并采用表面强化烤塑附着，耐磨损、耐高温、耐锈蚀性能好，借助弹簧的作用，在启动、停止按钮下完成闭合和分断的动作。
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普吉岛小菠萝，萌萌的还甜甜的，低至3.7元/斤~
泰国小菠萝是世界上最小的菠萝，被称为菠萝界“小王子”，吃起来特别甜，一般进口的会在七八分熟的时候采摘，觉得酸的可以用苹果捂几天再吃，规格：5斤。
目前售价18.5元包邮，折3.7元/斤，近期好价，比在普吉岛本地吃还便宜，喜欢可入。
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