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. How to choose a high price/performance ratioCDN providers?Two. TTCDN applies to Web applications, can hide the source station server IP, effectively reduce the source station server pressure, speed up the country's regional linesAccess speed and defense attacks.Three. The difference between high anti-CDN and high-anti-server.High-Anti-server stand-alone defense against sudden traffic attacks not significant defense effectCC attacks can cause server CPU to run fullMulti-node distributed defense

method of judging whether JavaScript objects exist.The sixth kind of notationBecause the value of myobj is directly equal to undefined in the case of a defined, but not assigned value, the above notation can be simplified:　　if　　(MYOBJ = = undefined) { var myObj = {}; }Here are two places to note, first the second row of the Var keyword can not be less, otherwise there will be a referenceerror error, followed by undefined cannot add single or double quotation marks, because here is the undefine

make Mutableinteger a thread-safe class, as follows:[Java]View PlainCopy Public class Synchronizedinteger { private int value; public synchronized int get () { return value; } public synchronized void set (int value) { this.value = value; } } The set and get methods are synchronized, with the same object lock, so that the Get method can see the change in the value of the set method, so that the value of values obtained each time through the Get method is the mo

Now the market is the mobile phone size is generally less than 6 inches, and the tablet is generally greater than 6 inches, so you can calculate the size of the device to determine whether the device is a flat or mobile phone.The judging code is as follows: Public Static Boolean Istablet (activity activity) { new displaymetrics (); Activity.getwindowmanager (). Getdefaultdisplay (). Getmetrics (DM); double diagonalpixels = Math.sqrt (Math.pow (dm.widthpixels,2) +math.pow (

service.The official answers to the questions we've revealedBuilt on the Java SE platform, the Java EE platform provides a set of APIs and runtime environments to develop and run large-scale, multi-tiered, scalable, reliable, and secure Web applications.This means that Java EE is:JVM + API + massively + multi-tier + scalable + reliable + Secure + network applicationsFurther refinement after removing the dispensable modifier is:JVM + api+ Network applicationsAccording to the conclusion of this p

Thank you so much...... ZJHow to tell the browser JS code

Platform service.The official answers to the questions we've revealedBuilt on the Java SE platform, the Java EE platform provides a set of APIs and runtime environments to develop and run large-scale, multi-tiered, scalable, reliable, and secure Web applications.This means that Java EE is:JVM + API + massively + multi-tier + scalable + reliable + Secure + network applicationsFurther refinement after removing the dispensable modifier is:JVM + API + network applicationsAccording to the conclusion

AJAX = Asynchronous JavaScript and XML (asynchronous JavaScript and XML).The request header for Ajax is as follows:As shown with the "X-request-with" attribute, the value of this property is "XMLHttpRequest"[main object in Ajax request (native object)]The request header for the normal request is:The sample code is as follows:String RequestType = Request.getheader ("X-requested-with"); if ("XMLHttpRequest". Equals (RequestType)) { System.out.println ("Ajax Request:") );} Else { System.out.p

#!/bin/bash # # Method 1a=1234;echo "$a" | [-N ' ' sed-n '/^[0-9][0-9]*$/p ' "] echo string A is numbers the first-n isShellTest flags, test for the subsequent string "' Sed-n '/^[0-9][0-9]*$/p '", and if not NULL, the result is true. SED shows all input line information by default, and the "-N" option for sed is to let sed not display, but only show what we need: that is, the following expression matches the row, which is implemented by adding "P" command in the expression. /^[0-9][0-9]*$/h

when exiting, even if the command to find does not exist, which also returns 0# which ls/usr/bin/ls# Echo $?0# which Aaano AAA in/usr/bin/bin/usr/sbin/sbin/usr/local/bin/usr/local/bin/usr/local /sbin/usr/ccs/bin/usr/openwin/bin/usr/dt/bin # echo $?03, many systems of which implementation, have secretly done some "outsiders" thingsSo, instead of using which, you can use the following method:$ command-v foo >/dev/null 2>1 | | {echo >2 "I require foo but it's not installed. Aborting. "; Exit 1; }

++++++++++++++++++++++++++++++++++++++++++Rpm-qa|grep Package++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++RPM-QL Software Name ++++++++++++++++++++++++++++++++++++++++++See how it is installed. There are two ways to install the source code and package. The source code installation can see configure's log, RPM and other packages, it is necessary to check the database, such as rpm-q for query. -Q ++++++++++++++++++++++++++++++++++++++++++Under Linux, how

practitioners have a relatively high IQ, with unique thinking and technical skills. That's because it companies hire people who like to analyze things and be interested in new technologies. To find a good job, it is necessary to have this spirit, only a lot of contact with new technology, in the high-speed development of the IT Industry has a strong competitiveness. If you have some of the above mentioned conditions, then Linux is actually not difficult to learn, do not believe ? you try it. Th

material for Linux.3. learn English wellMost of the operating systems used in the enterprise are Rhel and CentOS, and the English version, when looking for the latest technical manuals, most of the first-hand information is also English material, so learning English is crucial. Early can learn some computer-related words, so that they can understand the system commands and documents, after all, when using the Man command, the help information is in English. The first step to achieve, then go to

"+"Package private protected public return short static"+"STRICTFP Super switch synchronized this throw throws true"+"transient try void volatile while Todo"; String[] keys = Keystring.split (" "); String KEYSTR = Stringutils.join (keys,"|"); Tokenizer.add (KEYSTR,1); Tokenizer.add ("\\(|\\)|\\{|\\}|\\[|\\]|;|,|\\.| =|>|+"\\?|:| ==|+"\\+|-|\\*|/||\\| | \\^|%| \ ' |\ "|\n|\r|\\$|\\#",2);//separators, operators, etcTokenizer.add ("[0-9]+],3);//numberTokenizer.add ("[a-za-z][a-za-z0-9_]*],4);//iden

Array ECMAScript5 Array.isarray is the native method of judging arrays, IE9 and above support. For compatibility, in browsers that do not have this method, you can use Object.prototype.toString.call (obj) = = = ' [Object Array] ' instead. var IsArray = Array.isarray | | function (obj) {return Object.prototype.toString.call (obj) = = = ' [Object Array] ';} Function The simplest and best-performing approach is to typeof obj = = ' function '. The most reliable way to consider the bugs of some vers

How to determine the data of a double type in Java is 0In fact, this problem is very simple, just a lot of time to consider complex, directly with = = to judge. Here are the test examples:/** * How to determine the data of a double type is 0 * * @author leizhimin 2014/8/27 10:31 */public class Test4 {public static void main (string[]args) {Double x = 0.00000000000000000;Double y = 0.00000000000000001;System.out.println (x==0);System.out.println (y==0); }}Truefalseprocess finished with exit code

Citation: http://bbs.tianya.cn/post-414-38497-1.shtmlMethod One:var ary = new Array ("111", "22", "33", "111");var s = ary.join (",") + ",";for (Var i=0;i{if (S.replace (ary[i]+ ",", ""). IndexOf (ary[i]+ ",") >-1){Alert ("There are duplicates!");}}Method Two:var ary = new Array ("111", "22", "33", "111");var nary=ary.sort ();for (Var i=0;i{if (nary[i]==nary[i+1]){Alert ("Duplicate content:" +nary[i]);}}Method Three:var hash = {};for (var i in arr) {if (Hash[arr[i]])return true;Hash[arr[i]] = tr

How to tell if the system is a 32-bit or 64-bit Linux systemA day, need to download an installation package, suddenly forget their system is 32-bit or 64-bit system, the moment can not think how to view when 32 or 64, hehe, under the Baidu, there are many ways to find here, record, convenient for future inquiries:The first type: 12345 [Root@CentOS62 ~]# uname-mi686[Root@436704 ~]# uname-mx86_64 The second type:

To determine if a thread exists:If Assigned (workthread) thenbegin //do workend;　　To release a thread using:You can use the thread object to automatically release, using: workthread.freeonterminate: = true;If you want to release the thread yourself, you should first determine if the thread exists and whether it ends and then releases it, usingIf Assigned (Workthread) and (not workthread.finished) thenbegin //workthread.terminate; Stop thread //workthread.suspended; Causes the thre