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IOS Development Guide 11th Study on object archiving of data persistence

: _date forkey:@"Date"]; [Acoder encodeobject:_content Forkey:@"content"];}-(ID) Initwithcoder: (Nscoder *) Adecoder {anti-coding self.date= [AdecoderDecodeobjectforkeY:@"Date"]; Self.content= [Adecoder Decodeobjectforkey:@"content"]; returnSelf ;}3 Anti-Archive: queryQuerying all data Methods-(nsmutablearray*) findall{nsstring *path = [self applicationdocumentsdirectoryfile]; Nsmutablearray *listdata = [[Nsmutablearray alloc] init]; NSData * thedata =[nsdata Datawithcontentsoffile:pat

Uiview programming guide Study Notes

systems. 1. For uiview, we can use the following two sets of functions for conversion. Convertpoint: fromview:/convertpoint: toview: Convertrect: fromview:/convertrect: toview: The conversion process and results will be well interpreted: The blue and pink dotted boxes represent two different views (a view in blue and B view in pink). We call the rectangle to be converted M rectangle. At this point, we can see that the position of the M rectangle in a view is a blue solid rectangle, and

js-Authoritative Guide Study notes 3

, and you want . The expression returns true if the object on the right has a property name called the left operand value. Note that in the array, var data=[7,8,9],7 in data returns false because , not the 7 value in the array. 12, logic and operators. The left value is computed first, and if the left side evaluates to False, then simply returns the value of the left operand, not the right operand, or the right operand if the left value evaluates to True , value and returns it as the result

js-Authoritative Guide Study notes 14

dialog box they display.7. The alert () method also causes blocking and waits for the user to close the dialog box, but not always.8, ShowModalDialog () displays a modal dialog box that contains HTML formatting.9. Use the Open () method of the Window object to open a new browser window or tab.10. The script can specify the existing window by its name only if the document contained in the window is from the same source or if the script opens the window.11.The return value of open () is the Windo

js-Authoritative Guide Study notes 19.2

used for client sniffing. Similar to jquery.support.6. TheJquery.each () tool function differs from the each () method in that the each() method can traverse only the JQuery object , and the tool function can traverse the array element or object properties.7,Jquery.extend () The function accepts the object as an argument, it copies the properties of the second and later parameter objects into the first parameter object, overwriting it if the property with the same name already exists in the fir

Js-authoritative Guide Study Notes 5

Object.getownpropertydescriptor () . To set attributes for a property, or to have a new property with some attribute, you need to call Object.defineproperty (), pass in the object you want to modify, the name of the property you want to create or modify, and the property descriptor Object.18. to detect whether an object is a prototype of another object or in a prototype chain, use the isprototypeof () method . Similar to the instanceof Operator.19. to get the class of the object, you can call t

Today is the second world for Project manager to guide the study of PHP practical projects

default when @param string $value has a value*/function Idselect ($SqlForm, $SelectName, $class, $SqlId, $SqlColumn, $title, $value) {$SEARCHSQL = mysql_query ("select * FROM {$SqlForm}");while ($Search = Mysql_fetch_array ($SEARCHSQL)) {$key = $Search [$SqlId];$option [$key] = $Search [$SqlColumn];}Return Select ($SelectName, $class, $title, $option, $value);}function Select ($name, $class, $title, $option, $value) {$result = "". Option ($title, $option, $value)."";Returns a full drop-down men

Advanced Bash-shell Guide (Version 10) study notes two

"$octal"]Ten Thenecho "$decimal equals $octal"Elseecho "$decimal isn't equal to $octal" # Equal to 017+ fi # doesn ' t evaluate within [single brackets]!if [["$decimal"-eq "$octal"]]Thenecho "$decimal equals $octal" # equals 017Elseecho "$decimal is not equal to $octal"FI # evaluates within [[double brackets]]!((...)) Arithmetic testIf the expression evaluates to 0, its exit status code is 1 or FalseIf the expression evaluates to non-0, its exit status code is 0 or TrueIts exit status and [...]

MongoDB Authoritative Guide Second Edition study note--mongodb Introduction

independent permissions. Different databases are placed in different files. namingThe database will eventually become a file in the file system, the database name is the corresponding file name, so there are many restrictions on naming. The database is identified by name. can be any utf-8 string, except for the following special cases: cannot be an empty string (“”) must not contain/,\,.,’’,*,,>,:,|,?,$(a space),(NULL character). Basically, you can only useASCIIthe letters and numbers in

R study Notes "five" R Language Beginner's Guide--Chapter Two summary

The second chapter learns the R function:1 sum calculation and sum (x,na.rm=true) calculated in Vector x, which excludes NA elements2 Median calculates the median to return the number of the middle of a sample data median (x,na.rm=true)3 Max COMPUTE Max Max (x,na.rm=true)4 min Compute min min (x,na.rm=true)5 c () Connect data connection data to form a vector. C (a)6 Cbind data cbind with column variables (x, y, z)7 Rbind data rbind with row variables (x, y, z)8 vectors in vector form with data v

R study Notes "six" R Language Beginner's guide--accessing variables, working with subsets of data

each 1 is replaced by M, 2 is replaced by FUsing the reclassify factor variableBoxPlot (GSI ~ fsex,data = Squid)M1 Summary (M1) call:lm (formula = GSI ~ Fsex + flocation, data = Squid) residuals: Min 1Q Median 3Q Max-3 .4137-1.3195-0.1593 1.2039 11.2159 coefficients: Estimate Std. Error t value Pr (>|t|) (Intercept) 1.35926 0.07068 19.230   (There is only one Insert script feature found)M2   The estimated parameters are consistent, but the second method oc

Lua Game Development Practice Guide Study Notes 2

, Table. getn (mytable) Do Print (mytable [Index]) End Table. Sort (mytable) This simple function traverses the entire table and rearrange it from small to large. 6.2. Table. insert (mytable, positon, value) Table. the insert function inserts a new value in Table China. The location parameter is optional. If no value is set, a new value is added to the end of table A. If this value is specified, it is inserted to the specified position. Table. insert (mttable, 25, "hello ") 6.3.

JS Authoritative Guide---study notes 02

character. A reserved word is a reserved keyword that may not be a keyword now, and may become a keyword later.6. Object and array initialization expressions are actually creating a new object or arrays. Also known as: Object direct amount, array direct amount, however they are not original expression.7, array initialization, if there is no value in the middle, can be omitted directly;var myArray = [,,, 3]; Two values are omitted in the middle and are automatically populated with undefinedvar m

JavaScript authoritative guide 13th study Note: Date and time of use

9 1996" can also be accepted and parsed. However, the result Date object includes "Friday November 9 1996". JScript handles all of the standard time zones, as well as global standard times (UTC) and Greenwich Mean Time (GMT). Hours, minutes, and seconds are separated by colons. Although not all of these three items need to be specified. "10:", "10:11", and "10:11:12" are valid. Assuming a 24-hour clock is used, it is wrong to specify "PM" for the time after 12 o'clock noon.For example, "2

CSS-CSS Authoritative Guide Study notes 4

Chapter III1, the value of inheritance is not special, even 0 of the particularity of not. So changing the style of a hyperlink generally requires an independent declaration and cannot be changed by inheritance.2. Cascading-conflicting declarations are sorted by this cascading process and thus determine the final document representation. The core of this process is the particularity of selectors and their related declarations and the inheritance mechanism.Fifth Chapter1, Font-weight:border. Firs

CSS-CSS Authoritative Guide Study notes 8

12th chapter list and generated content1, List-style-type:cjk-ideographic generate 1234 of the serial number2, whether it is UL or Ol,list-style-type unrecognized values are applied to decimal.3, the list-style-image will inherit.4, Shorthand: List-style:type | Image | PositionThe 13th Chapter user interface style;1. Outlines are similar to borders, but outlines do not participate in the document Flow .2. Outlines and borders can coexist .3, the contour of the four sides of the style (including

CSS-CSS Authoritative Guide Study notes 6

Margin-bottom, to clear the element set Margin-top is not convenient (the reason for clearing the area).7. For a non-root element, if the position value is absolute, the containing block is the nearest position value is not a static ancestor element .8. Top/right/bottom/left applies to elements where the position value is not static. The margin boundary of the element contains the offset of the inner margin boundary (border) of the block relative to it.9. Top:auto;left:auto in Position:absolute

js-Authoritative Guide Study notes 15

element node, 3 represents the text node, 8 represents the comment node, and 11 represents the DocumentFragment node .14. The children property of the element object, similar to ChildNodes, is also a NodeList object, but the children list contains only the element object .15. The text and comment nodes do not have a children property, meaning that the Node.parentnode property cannot return a text or comment node .16. The Style property value of any HTML element is a cssstyledeclaration object,

js-Authoritative Guide Study notes 15.3

the form is submitted .7. The onchange event handler for the text input field is triggered when the user enters new text or edits an existing text, indicating that the user has finished editing and moved the focus out of the text field .8. If the user directs to a new fragment in the document, thelocation.href will change , but document. The URL does not.9, document.write () joins its string argument, and then inserts the result string into the document where the script element is called.10. Th

js-Authoritative Guide Study notes 18

server contains 3 parts: 1, a number and a text-based status code to show the success and failure of the request. 2. A collection of response headers. 3, the response body. 6.get is used for regular requests , and he applies when the URL completely specifies the request resource when the request does not have any side effects on the server and when the server's response is cacheable. The post method is commonly used in HTML forms , which contain additional data in the request body and are often

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