best way to learn angular 2

}); Topic.subscribe ("MM", function (text)//Accept message, first parameter is message name, second parameter is callback function {alert (text);});});Code Explanation:① initially has two buttons: "Test 1" and "Test 2". Test after 1 click Alert, Test 2 Click to create a New button (can be created multiple times), New button click after alert② about alert behavior: After a click is not a direct alert, but a

sequential;Dict The third feature is that as a Key elements must be immutable , the basic types of python, such as strings, integers, floatingThe points are immutable and can be used as key. But the list is mutable and cannot be a key.Set of Python collectionsThe way to create a set is to call set () and pass in a list,list element as the set element:s = set ([' A ', ' B ', ' C '])The elements stored inside the set are unordered . Set cannot contain

I wrote an article yesterday to learn javascript (1) Through jQuery source code. There is a method for defining Object C in it. I didn't pay too much attention to the technical details in the early days. Later, I checked the information and found that there were many clever places in it. Today I will share with you the clever 1: Functions Functions are a rare talent in javascript code. ♥It can return code segments and encapsulate relatively independe

possible to process multiple channels in a goroutine. It is impossible for us to block the two channels. In this case, we should select the field. Similar to the SELECT statement in C language that can monitor multiple FD, select statements in go language can wait for multiple channels. C1: = make (Chan string) C2: = make (Chan string) Go func (){ Time. Sleep (time. Second * 1) C1 }() Go func (){ Time. Sleep (time. Second * 2) C2 }()

. version Information; 3. author and contact information; 4. file creation date; 5. history and so on. This will help rewrite and debug future programs! Announcement of major environment variables:We recommend that you configure some important environment variables. laruence believes that path and Lang (if used to output related information) are the most important! In this way, we can directly issue some external commands when this program is running

what we want, why is this synchronized the steward? We see the red part of the main method in the ThreadStart class, we create an instance of Safethread and its reference before starting the thread, and use its reference as a parameter to initialize the thread class ThreadRead1, That's when the reference to the Safethread instance is a sweet Bobo, who gets who can lock the synchronized locked block of code and execute the block code.Here's an example of what you can do with your own practice an

test method or fixture as the Ignore property and will not execute when the test is run. For example, we often use this attribute to mark tests that are temporarily not running or to refactor the software, instead of using annotations or renaming methods, so that the test code compiles with the code with this tag and does not run the tagged test code at run time, ensuring that the past tests are not forgotten.Testfixture syntax[testfixture] [Ignore("Ignore a Fixture")] yjingleefixture{}Test sy

Learn about Dynamic Links (2) -- Address-independent code and Dynamic Links Remove the part of the instruction that needs to be modified and place it in the Data zone to keep the instruction part unchanged. Each process can have a copy of the data part. This is the Position-independent Code (PIC). The advantage is that the commands are shared by multiple processes to save memory. To implement PIC, you mus

IOS project development practice-learn to use the TableView list control (2) To use the TableView list control in iOS development, you can not only directly use TableViewController as the main interface, but also use the TableView control. TableView can be used for more customization to meet more requirements. It is commonly used in development. The specific implementation is as follows: (1) create a Single

* If the initialization work takes a lot of time, you need to set the servlet to initialize when the server starts. *servlet>Load-on-startup>2Load-on-startup>* Configure current servlet load order at server startup, value: 0-6, lower value, priority load 4, servlet virtual path refers toservlet-mapping> Servlet-name>HelloWorldServlet-name> Url-pattern>/helloUrl-pattern> servlet-mapping>inUrl-pattern>Path 1, only use/or * start