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Block-level scopes (1) let replaces var ES6 proposes two new commands for declaring variables: let and const. Among them, let can completely replace var, because they have the same semantics, and let has no side effects. 'use strict'; if (true) { let x = 'hello'; } for (let i = 0; i < 10; i++) { console.log(i); } If the above cod ...

Change from: http://blog.csdn.net/qt_pixie/article/details/1361777 MergeSort and QuickSort are two comparatively similar sort methods, which are implemented through Divide and Conquer. You need to sort in a recursion fashion. Their similarity lies in the principle. The first thing to do is to split N elements into two parts for sorting, eac ...

Do you remember that you used to learn ListView from Issue 38 to Issue 50, among which you used 8 to talk about the use of ListView, I believe you have mastered it. So let's learn about a new list component in Android 5.X, which is the use of RecyclerView.     I. Overview of Recycler View   From the previous study, we know that ListView ...

Chapter 2 of Python Foundation Binary system Character encoding Basic Data Type - Number Basic Data Type - String Basic Data Type - List Basic data type - tuples Variable, immutable data types and hash Basic Data Type - Dictionary Basic Data Type - Set Binary system Binary system is a kind of system used in computing technology. The binary ...

Last article: Wechat Small Program E-Commerce Practical Warfare - Home Page (Part 1) Well, in the last issue, we finished the homepage search, navigation bar and advertisement rotation. Then we will continue to finish the rest of our homepage. Let's see what we want to achieve first. In this issue, we want to achiev ...

This paper mainly introduces the realization of VUE2.0 image upload function. The principle is to achieve this effect through js control and input tag, without loading other components. The results are as follows: 1.DOM code 1.1 input tag Because we upload pictures by input tag, but the style of input tag is ugly, so ...

AIDL (Android Interface Definition Language) is an Android interface definition language. Simply speaking, in the process of Android development, when encountering problems of multi-process development or inter-process communication, it can be implemented simply and quickly. The following describes the implementation st ...

Title Map IO in Java Classification of IO The first is: Input and output streams The second is: Byte stream and character stream The third category: Node Flow and Processing Flow Node flow processes data, and processing flow is processed on the basis of node flow. Focus in IO: InputStream OutputStream FileInputStream FileOu ...

PostgreSQL comes with a simple full-text retrieval engine that enables full-text retrieval of small amounts of data.In this article, we will guide you through this feature, which is sufficient for small-volume searches without the need to build additional heavy-weight full-text retrieval servers such as ES. For detailed full-text ...

Usually, in the context of front-end and back-end separation, our back-end services are usually returned to the front-end formatted data, such as Json. At the beginning, we used JSON package to produce a JSON string, which is customized with some API s of http protocol. spring has evolved to the present day and has packaged generic ...