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promotionFunction declarations are promoted, general variables and variable expressions are not promoted3.2 Description of this several different usage scenariosA: 1. Perform as a constructor function2. Performing As Object properties3. Perform as a normal function4.call,apply,bind//Call , apply, bindfunctionfn1 (name,age) {alert (name) Console.log ( This)}fn1.call ({x:' Lily ', 20)//eject Lily,this ={x:100}functionfn2 (name,age) {alert (name) Console.log ( This)}fn2.apply ({y:200},[' Lily ', 2

processing 2. Compatibility 3. Vector Graphics 4. Client Resource SchedulingThe disadvantage of Ajax: 1. It may corrupt the browser's back-up function 2. Using dynamic page updates makes it difficult for users to save a particular state to a collection, but these are addressed in a related way.The disadvantages of Flash: 1. binary format 2. Format private 3.flash files are often very large, users need to endure a long wait time for the first time 4. Performance issuesThe following 7 global func

Workaround: (The following methods are simple to sort, from simple to complex)Method one: In ssh Secure file Transfer (upload file that), open the "Operation" menu, open the "File Transfer Mode" submenu, and then select "Binary", ok!Law II: Delete the same name file on the server and then passLaw three: If the file on the desktop, the file will be uploaded to other partitions, and then upload!or replace users with higher privileges"FAQ log" SSH upload

To publish the Web site to IIS, Access has the following error:HTTP Error 500.21-internal Server error handler "Pagehandlerfactory-integr" has an error module in its module list "Managedpipelinehandler"Cause: After you install the framework v4.0, IIS is enabled, causing the framework to not be fully installedFIX: Start with all programs, accessories, right-click Command prompt, run as administrator, input "%windir%\microsoft.net\framework\v4.0.30319\aspnet_ Regiis.exe-i "command line.Deployment

consistent app ID in the provisioning portal.5 Add the Udid you want in the provisioning portal. (plus all the good)6 Create provisioning profile for your certificate, specifying your app ID and Udid.7 Download the profile you just created and drag it into your Xcode organizer.Then, you can sign your project and let them run on your device.In Target–build Settings, scroll down to the Code signing section.Try editing the debug schema, which is suitable for team collaboration:Select "IPhone Devel

1. When installing a library, for example, when pip install tinify appears permission denied, add sudo at the front of the installation command such as sudo pip install tinify.2. When installing a library, such as sudo pip install click when Read timed out appears, turn the install command into sudo pip--default-timeout=100 install-u click.Continue to update .....================================================================If you have any questions, please add my qq:610774281:stephenli225. To

memory, if the volatile variable is written, when the CPU executes to the lock prefix instruction, Will write the data of the cache row of this variable to memory, but there is still a problem, even if the memory data is up-to-date, the other CPU cache or the old value, so in order to ensure the cache consistency of each CPU, each CPU by sniffing the data propagated on the bus to check their cached data validity, When the data of the memory address corresponding to the cache row is found to be

For list, which is an array of indeterminate length, 100,000 data * 12 times times that is 1.2 million data, it only needs about 93MS?With a two-dimensional array, the effect is similar, 78ms, visible list efficiency is only a little bit worse than double??For more instructional videos and downloads, please pay attention to the following information:My Youku Space:Http://i.youku.com/acetaohai123?My online forum:http://csrobot.gz01.bdysite.com/?Problem Exchange:qq:910358960Email:[email protected]

First, startApachewhenTips thePort is occupiedWorkaround :(1) Modify the Apache configuration file found in the httpd.conf file Listen 80, modify 80 to another unused port (this mechanic changed to 8090)Note: It is not recommended to use, too much later needs to be modified(2) Enter service.msc into the service page in the search boxLocate SQL Server Reporting Services stop Service (√)Note: The solution adopted by the authorSecond, when starting the Xmapp Control Panel, the totaldisplay has been

portion of $ (". txt"). focus (function () {//here ' input.inputframe ' Is the input box of my bottom input field, triggering event when it gets focus interval = setinterval (function () {//Set a timer, time setting is similar to the time required to eject the soft keyboard document.body.scrollTo p = document.body.scrollheight;//Gets the focus and assigns all content in the browser to the browser scroll section height},100)}). blur (function () {//Set the event when the input box loses focus CL

weaker)* The reader will automatically parse according to the semantics of the tags, presenting a more readable form of content (accessible reading)* Search engine determines context and weight issues based on the semantics of tags* Convenient for later development and maintenance, more efficient team work93. Some effect, there are two implementations can be achieved, scheme one, IMG tag, scenario Two: Background map, two options how to choose? What is the standard of measurement?The following

style effect, the priority of the ID is higher than the class level, the HTML does not have a few IDs, in the CSS gets all, but in JS through the document gets the firstThere are several ways to introduce 57.CSS, what is the difference between link and @import?See my blog: http://www.cnblogs.com/shireyhu/p/7827082.htmlLink is the XHTML tag, in addition to loading CSS can also define other transactions such as RSS, @import belong to the CSS category, can only load CSS.When a link references a CS

/rpmThis allows you to complete the RPM installation, and later you can find the RPM version of the software on the Web or on the CD. then using RPM for installation, the RPM method is simple:1. Install the package with RPM: RPM-IVH Software file nameFor example, the name of the package and the installation progress bar will be printed on the RPM-IVH fvwm95-2.0.43a.chinese-1.i386.rpm screen:FVWM95 ###############When the progress bar go to the end, the Chinese fvwm95 (a X-window interface) is in

Just started to learn Python3, Baidu, the use of Python, see the crawler download pictures is very fun, so Baidu all kinds of information learning, the results are always running unsuccessful, finally changed, recorded.From urllib Import requestImportUrllibImportRedefgethtml (URL): page=Urllib. request. Urlopen (URL) HTML=Page.read ()returnHTMLdefgetimg (HTML): Reg= R'src= "(. +?\.jpg)"'Imgre=re.compile (reg) HTML=html.decode ('Utf-8')#do not write this line will error: Typeerror:cannot use a st

Puzzle One: Small problems with data operations1) to avoid using float and double type when the problem requires an exact answer, use the int long bigdecimal type. This is because not all decimals can be represented as exact representations of binary floating-point numbers when operating in Java virtual. Therefore, when doing business calculations (similar to bank calculations) it is recommended to use BigDecimal of course when constructing a double type with a string instead.2) often divisible.

the young generation of the Eden area and does not affect the old generation. Because most objects start in the Eden area, and the Eden area is not very large, GC in the Eden area is frequent. Thus, it is generally necessary to use fast and efficient algorithms, so that Eden can be free as soon as possible.Full GC, which organizes the entire heap, including young, tenured, and perm. Full GC is slower than SCAVENGEGC because it needs to be recycled for the entire pair, so you should minimize the

::operator=(ConstString other)//input parameter is const A type the { + if( This! = other)//Check self-assigned value - { $ String strtemp (str); $ Char* Ptemp =Strtemp.m_pdata; -Strtemp.m_pdata =m_pdata; -M_pdata =ptemp; the } - return* This;//returns a reference to this objectWuyi}View Code1 //assignment function, poor practice2String string::operator=(ConstString other)//input parameter is const3 type4 {5 if( This= = other)//Check self-assigned value6 return* This;7Delete

post to publish. All examples are personally tested and shared on GitHub. Use these examples to motivate yourself to benefit others. At the same time, all the posts in this series will be published in the blogger personal public search "Love Ape" or "ape_it" to facilitate reading. If there is any infringement of the original rights of the author, please inform the blogger in time to delete if the reader has objections to the content of the text or questions are welcome through the blog post or

1:unused ImportEnvironment: Ubuntu 14.04 Eclipse 3.8When developing using the Pydev plugin in the Eclipse environment, enter: Import Re, a yellow warning appears on the left, and the label will appear after it is placed: Unused import reThe reasons are as follows: (ref:http://stackoverflow.com/questions/16394732/unused-wild-import-why)That's message just tells you're importing features from a module so you don ' t need, which means you should prob Ably import just what are you need. You shuld si

right-shift operator with a negative shift length to act as a left-shift operator and vice versa. But the sentimentThis is not the case. The right-shift operator always moves to the right, and the left-shift operator always acts as a left-shift. The negative shift length is converted to a positive shift length by preserving only the lower 5 bits and rejecting the other bits (if the left operand is a long type, the lower 6 bits are retained). Therefore, if you want to move an int value to the le