Advanced knowledge of JavaScript

1 Function object Section 1: Function object introduction Function is the method object of js. You can use function instances to generate any js method object The second section: creating method objects with Function <script type="text/javascript"> /* function say(name,age){ alert(name+"T ...

Posted on Thu, 30 Jan 2020 07:19:31 -0800 by djrichwz

acwing 245 can you answer these questions

Title Link Title Description: Given A sequence A with length N and M instructions, each instruction may be one of the following two: 1. "1 x y", the maximum continuous subsegment sum in the query interval [x,y], i.e 2. "2 x y", change A[x] to y. For each query instruction, an ...

Posted on Wed, 29 Jan 2020 22:02:03 -0800 by Azad

Data preprocessing -- data discretization

Data discretization Data discretization (also known as data grouping) refers to grouping continuous data into a segment of discretized interval. According to whether the class attribute is considered in the discretization process, the discretization algorithm can be divided into supervised algorithm and ...

Posted on Wed, 29 Jan 2020 20:30:31 -0800 by Garion

Native js implementation drop-down box selection component development

Drop-down box selection Functional requirements: After clicking div, the div shows the aggregation state and the contents of the hidden box. After selecting the number of children, if the number of children is greater than 0, the corresponding number of child age selection boxes appears below. The nu ...

Posted on Wed, 29 Jan 2020 18:31:10 -0800 by XaeroDegreaz

[Netty Learning Notes] II. NIO Core Component Buffer

In the previous section, we learned that the three core components of NIO are Buffer, Channel, Selector. Relevance diagrams for the three core sections: Each channel corresponds to a Buffer Selector corresponds to one thread, and one thread corresponds to multiple channel s The figure above shows thre ...

Posted on Wed, 29 Jan 2020 18:24:45 -0800 by rami103

Spring's bean Management (mixed use of annotation injection properties and annotation files)

Spring's bean Management (mixed use of annotation injection properties and annotation files) Annotation mode injection properties 1. Create the service class and dao class, and get dao object in the service Inject attribute first annotation @ Autowired (1) create dao and service objects            ...

Posted on Wed, 29 Jan 2020 07:47:30 -0800 by TashaAT

Basic notes of decision tree in machine learning practice

Advantages and disadvantages of decision tree Advantage Low computational complexity Output is easy to understand Insensitive to missing median Can process irrelevant feature data shortcoming Over matching problems may occur Decision tree principle One example of A game with 20 problems is i ...

Posted on Wed, 29 Jan 2020 07:16:00 -0800 by klance

Hibernate (10) one-to-one association mapping

This blog series is summarized here: Hibernate summary One to one association mapping One to one association mapping 1. Create model class 2. Configuration mapping file 3. One to one single end test Preservation query 4. One to one bidirectional association mapping Preservation query The so ...

Posted on Tue, 28 Jan 2020 23:00:18 -0800 by zelot1980

How to use LINQ to select objects with minimum or maximum attribute values

I have a Person object with the Nullable DateOfBirth attribute.Is there a way to use LINQ to query the earliest/smallest DataOfBirth value in the Person object list. This is where I started: var firstBornDate = People.Min(p => p.DateOfBirth.GetValueOrDefault(DateTime.MaxValue)); Empty DateOfBirth values are set to DateTime.MaxValue ...

Posted on Tue, 28 Jan 2020 19:16:18 -0800 by khalidorama

How to clean up Python objects correctly?

class Package: def __init__(self): self.files = [] # ... def __del__(self): for file in self.files: os.unlink(file) __Del? Failed with an AttributeError exception. I understand that when I call del, Python does not guarantee Global variable (in this case, whether there is member data \\\\\\\\. If thi ...

Posted on Tue, 28 Jan 2020 05:56:56 -0800 by delassus