24th-day notes for IOS (Block Introduction) and 24th-day ios
Knowledge points of IOS Learning (oc language)
I. Introduction of Block
1) concept: block is a data type. It is similar to a function without a name in C language. It can receive parameters or return values that are called like C functions.
Encapsulate a piece of code that can call a block anywhere or as a function parameter, and return a function
IOS stage learning 22nd-day notes (JSON data format Introduction), 22nd-day json
Knowledge points of IOS Learning (oc language)
I. JSON Data Format
1) concept: json is A network data transmission format with A value/object: {"A": 1, "B": "2 "...} Dictionary; Object Sequence: [,] Two Data Types
2) URLWithString encapsulates the string URL into an NSURL object, for example:
1 NSString *urlStr=@"http://10.0.8
Python Day 1 ----- simple login verification, python Day 1 -----
-----------------------------------------
Write logon Interface
Requirements: 1. Enter the user name and password
2. The welcome information is displayed after the authentication is successful.
3. Lock after three wrong attempts
--------------------------------------
#coding=utf-8
__author__ = 'wangwc'import sys,os
Count = 0Locked = 0Mark_user
Python day 1, python get the first day of this week
Dict key-value set.
1 d = {2 '1': 'a',3 '2': 'b',4 '3': 'c'5 }
(1) obtain the length of a set: len (d) = 3(2) obtain the value:
Method 1: d [key]; example: d ['1'] = 'A'
If the key does not exist, the system reports a keyError. You can use
If '1' in d:
Print (d ['1'])
Method 2: d. get (key) method. If the key does not exist, None is returned.
E
Learning Object-C from scratch --- the fourth day (2), object-c --- the fourth day
I have been busy with the company recently and stopped for a few days. Learning is more important than sticking to it.
Today, I will explain how to use Object-C data types and expressions.
1. float Type
//// Main. m // Demo3 /// Created by lee on 14/11/3. // Copyright (c) 2014 lee. all rights reserved. // # import
The 1.1 fl
(must be 0xf0)Dw9 ;fat Length (must be 9 sectors)Dw - ;1 tracks with several sectors (must be)Dw2 ;number of heads (must be 2)Dd0 ;do not try the partition (must be 0)Dd2880 ;override disk Size onceDb0,0, 0x29;fixedDD 0xFFFFFFFF;(may be) Volume code labelDb"Hello-os" ;Name of the disk (11 bytes)Db"FAT12" ;the name of the disk format (8 bytes)Resb - ;empty 18 bytes First;Program CoreEntry: MOVAx0
1. Minimum Cost (money. PAS/C/CPP) Problem DescriptionSome of the N people can transfer funds between their bank accounts. The fees for transfers between these individuals are different. Given the need to deduct a few percent of the service charge from the transfer amount when transferring funds between these people, may I ask how much a requires at least so that B will receive 100 yuan after the transfer.InputEnter two positive integers n and m in the first line, indicating the total number of
Boundary and buffering are key tools for balancing life and work. They allow us to spend less time and energy on more things, and find a balance system for your personal work and life. If we have too many things to do, but we don't have enough time to feel a lot of pressure, then setting borders and buffering can play a very good role to release the pressure.
No one will set valid boundaries for you, because only you are the one who knows you the most, and the boundaries and buffering needs to
Def juge (Num, week_list): W = input ('enter the % s letter' % num) W = W. lower () RES = [] State = 0 for week in week_list: If W = week [0 + num-1: 1 + num-1]: State + = 1 res. append (week) If State = 1: Print ('% s' % res [0]) Elif State> 1: Print (' enter it again ') num + = 1 week_list = res juge (Num, week_list) else: Print ('invalid input ') If _ name _ =' _ main __': # initial condition num = 1 week_list = ['mon', 'tues ', 'wed', 'thur', 'fri', 'sat ', 'sun'] juge (Num, week_list)
Ente
Use CSS3 animations as much as possible to turn on hardware acceleration.
appropriate use touch events instead click event.
Avoid using css3 gradient shadow effect.
can be used transform: translateZ(0) to turn on hardware acceleration.
Do not abuse float. Float is computationally large at render time and minimizes use
Web fonts are not abused. Web fonts need to download, parse, redraw the current page and minimize use.
Rational use of requestanimationframe animation instead of set
Every day p figure added "Facial Expression package" function, we can take a look, now we open the software, and then click the "immediately change the face" button;
After entering then click the "Start Making" button, the effect is as follows;
Choose a positive photo, can be your photos, can also be your friend Oh, must be a face photo Oh ~
Click "Confirm" button after adjusting position;
All right, the above is small
Global variables can weaken the program's flexibility. So in JavaScript, one of the key issues is to control and avoid global variables. (Reduce global pollution)method One, create only one global variable in the application, and then organize multiple global variables into this namespace. this reduces coupling to other applications, builds, and class libraries. method Two, using closures for information hiding,Closed Packageintrinsic functions can access parameters and variables of external fun
, b) {if(A = = =b) {return0; } if(typeofA = = =typeofb) {returnA ; } return typeofA typeofB? -1:1; } ); for(vari=0;i) {Document.writeln (array[i]); }Splice ()//remove, replace an elementvar array = [8,6, ' B ', 1,5, ' C ', 7, ' a ', 4]; Array.splice (1,3, "xxx", "yyy", "zzz"), 1 is the index from which to remove, 3 is the number of removed, the following parameter corresponds to the removal of the replacement, if the parameter after 3 is less than the number of removed, the
1, daily automatic backup
Open Enterprise Manager and go to Administration-database maintenance plan. Right click on the right side of the window, select "New Maintenance Plan", start the Database Maintenance Plan Wizard; Click "Next" to select the database to be maintained, to maintain the feature database, select the Last radio box and check the database name to be maintained; " Next, select Update Data optimization information, next check Database integrity, next to specify the database back
It ' s Saturday today, what the it after + + + ... + NN days? Input
There are multiple test cases. The "a" of input contains an integer T indicating the number of test cases. For each test case:
There is only one line containing one integer n (1 Output
For each test case, output one string indicating the ' Day of week. Sample Input
2
1
2
Sample Output
Sunday
Thursday
Hint
A Week consists of Sunday, Monday, Tuesday, Wednesday, Thursday, Friday an
Implement day-to-day management of mail services
1. Mail protocol supported by mail client
* Outlook 2003:mapi,smtp,p0p3,imap4,http
* Outlook EXPRESS:SMTP,POP3,IMAP4,NNTP
* Outlook Web Access:http
SMTP protocol: Simple Mail Transfer Protocol, typically used to transfer e-mail messages from a client to a server, or from one server to another
POP3 protocol: Post Office Protocol is an offline mail protoc
optimal, because when we do queries, the query optimizer will use the indexes we built to create the query scheme,If one executes the other, the other query scheme is close, and the scheme is saved by MongoDB, of course, if you want to use your own specified query scheme, this isYes, in MongoDB we are provided with a hint method that allows us to execute violently.Five: Delete indexAs business needs change, the original index may not be necessary, and some people may want to say that there is n
int PageCount;7 //Get the number of people with 9 in the name8 var list = helper. List (1, +, I = I.name.contains ("9"), out PageCount);Ten console.read ();One }The total running codeUsing system;using system.collections.generic;using system.linq;using system.text;using System.Configuration;using System.linq.expressions;using mongodb.configuration;using mongodb.linq;using Mongodb.attributes;namespace mongodb.test{public class mongodbhelper
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