\ MyFunction () to call it from lib1.php or lib2.php.Fully qualified names are very useful for one-time function calls or object initialization, but they do not have practical value when you generate a large number of calls. as we will see in the following discussion, PHP provides other options to ease typing in namespaces.◆ Qualified name)There must be at least one namespace separator identifier, such as Lib1 \ MyFunction ().◆ Unqualified name)There is no namespace separator identifier, such a
") { this.name = name; } }; BaseObject.prototype.name = 'default';
In this version, BaseObject inherits the name attribute in the prototype and is set to 'default '.. At this time, if the constructor is called without parameters, it is automatically set to default. Similarly, if the name attribute is removed from the BaseObject, the system will automatically search for the prototype chain and obtain the 'default' value:
Var thirdObj = new BaseObject ('unique'); console. log (thirdObj. n
. log (thirdObj. name); //-> the result is 'default'Common error 8: Guide to instance method creation errors
Let's look at the following code:
var MyObject = function() {} MyObject.prototype.whoAmI = function() { console.log(this === window ? "window" : "MyObj"); }; var obj = new MyObject();
Now, for convenience, we create a variable to guide the whoAmI method, so we can directly use whoAmI () instead
() Judgment to verify your answer. PolymorphicClass has an inheritance relationship, and the subclass type can be transformed upward as a parent class type, if we derive Student and Teacher from person, and both write a WhoAmI () Method:class Person (object): Def __init__ (self, Name, gender): Self.name = Name Self.gender = Gender def whoami Whoami": Return '
.
The following uses the "WhoAmI" mirror created earlier to establish such a service.
Root@pi6 $ docker Service Create--name whoami-p 80:8000 Hypriot/rpi-whoami buy0q65lw7nshm76kvy5imxk3With the help of the "Docker swarm ls" command, we can check the status of this new service.
ROOT@PI6 $ docker Service ls ID NAME SCALE IMAGE COMMANDBuy0q65lw7ns
provides other options to ease typing in namespaces.◆ Qualified name)There must be at least one namespace separator identifier, such as Lib1 \ MyFunction ().◆ Unqualified name)There is no namespace separator identifier, such as MyFunction ().Work in the same namespaceThink carefully about the following code:Myapp1.php
namespaceApp\Lib1;
require_once('lib1.php');
require_once('lib2.php');
header('Content-type:text/plain'
registration (ETCD), a registered partner process (docker-register), the discovery partner process (docker-discover), Some back-end services (WHOAMI) and the last consumer (Ubuntu/curl).
The registration and Discovery component works as a device and application container, so the registration or discovery code on the backend or consumer container is not embedded. They only listen to ports or connect to other local ports.
Service Registration-ETCD
Befo
class.PolymorphicClass has an inheritance relationship, and the subclass type can be transformed upward as a parent class type, if we derive Student and Teacher from person, and both write a WhoAmI () method:class Person (object): def __init__ (self, Name, gender): self.name = name Self.gender = Gender def WhoAmI (self): return ' I am a person, my name is%s '% Self.nameclass Stu
configuration file directory./usr/local/Cellar/hadoop/2.7.0/libexec/etc/hadoopLowerConfigure hdfs-site.xml
Set the number of replicas to 1:
Configure core-site.xml
Set the port for file system access:
Configure mapred-site.xml
Set the framework used by MapReduce:
Configure yarn-site.xml
Alias
alias hstart="start-dfs.sh ; start-yarn.sh"alias hstop="stop-yarn.sh ; stop-dfs.sh"Format a File System
$ hdfs namenode -formatStart Hadoop
hstartCreate a user space
Hdfs dfs-mkdir/userhdfs dfs-mkdir/user/
level of an inline type of method does not become looser than the default internal as the type itself accesses the level of easing.Question: Why does a closure outside a function definition not cause a change in the reference count of other variables in the scope? Description of the problem:Carefully observe the different outputs of the following different code fragments:Fragment A:class Book{ let name: String lazy var whoami:(()->String)?
executed in eval. For example, the introduction of dynamic modules. For example, an online crawler platform may have multiple crawlers located in different modules, on the server side, you only need to call the crawler type selected by the user on the client side, and perform dynamic calling through the backend exec or eval. the backend encoding is very convenient. However, if the user's request is not properly handled, serious security vulnerabilities may occur.0x01 use eval for "security"Curr
"WhoAmI" image created earlier to establish such a service.[email protected] $ docker service Create--name whoami-p 80:8000 Hypriot/rpi-whoami buy0q65lw7nshm76kvy5imxk3With the help of the "Docker swarm ls" command, we can check the status of this new service.[email protected] $ docker Service LS ID NAME scale IMAGE COMMAND buy0q65lw7ns
Address: http://www.sitepoint.com/php-namespaces-import-alias-resolution/
The first part of this series discusses why PHP namespaces are useful and the namespace keywords. This article will continue to study how to use commands and PHP resolve namespaces.
In the following example, two sections of code are almost identical. The only difference lies in their namespaces. Lib1.php
1 2 // application library 1 3 namespace App\Lib1; 4 const MYCONST = 'App\Lib1\MYCONST'; 5 function MyFunction() { 6
0x00 PrefaceEval is a built-in function that Python uses to execute Python expressions, and using eval makes it easy to dynamically execute strings. such as the following code:eval("1+2")eval("[x for x in range(10)]")[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]When the in-memory built-in module contains the OS, eval can also do the command execution:>>> import os>>> eval("os.system(‘whoami‘)")win-20140812chj\administrator0Of course, Eval can only execute Python's e
need. the whoami method has been redefined in class B. It should have output B to conform to our thinking.
CODE:Class {Public static function whoami (){Echo _ CLASS __;}Public static function identity (){Self: whoami ();}}Class B extends {Public static function whoami (){Echo _ CLASS __;}}B: identity (); // A
The fol
Post-binding/Delayed binding of the parent class and subclass in PHP lt ;? Php nbsp;/***** nbsp; nbsp; public welfare PHP Lecture Hall nbsp; altar: nbsp; http://www.zixue.it nbsp; Micro nbsp; blog: PHP in the parent class and subclass of the late binding/delay binding
/****
Yan 18 public welfare PHP Lecture Hall
Discussion: http://www.zixue.it
Micro Bo: http://weibo.com/Yshiba
YY Channel: 88354001
****/
/***
=== Note ====
Post-binding/Delayed binding
***/
Clas
CODE:
Class helper {Static function foo () {echo _ METHOD __;}}$ A = "helper ";$ B = "foo ";$ A: $ B (); // helper: fooLate Static BindingIf you do not know how to translate, it is easier to leave an original article. The timing of Event Processing for static methods has changed. Previously, events were handled during compilation and now events are processed during execution.
Before php 5.3, the following code will output A, but this is not what we need. the
??? Company Audit department required us to all the host system to add user behavior audit function, record user account login time and behavior information, I use a simple way to achieve the following, I briefly introduce the implementation of the methodImplementation steps:1. Create user behavior log to store directory/var/audit, Directory gives 777 permissions (because all users have to write files to this directory)Mkdir?-p?/var/audit;chmod?777?/var/audit??2, modify the system environment va
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.