Tag：Knowledge points
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Time：2021-2-21
We have already introduced it to you in the last articleNew content and basic page layout in HTML5This article will continue to introduce another component of HTML5 in a broad sense: Javascript data types. As a weakly typed language, JavaScript is characterized by dynamic typing. That is to say, you don’t need to declare the […]
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Time：2021-2-12
Recently, I saw a canvas implementationWatermark an imageAfter learning, I made a function of putting multiple pictures together. What we need to know: Data URLs FileReader HTMLCanvasElement.toDataURL() The steps are as follows: use<input type=”file”>To select a local file useFileReaderOfreadAsDataURLTo get it as a picturesrcOfdataURL Instantiate the image and draw it in thecanvasin useHTMLCanvasElement.toDataURL()Get the finished […]
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Time：2021-2-10
The purpose of this project is to use what we have learned at present to avoid forgetting. We will go through it in the later maintenance, so that what we have learned will not be forgotten. The project covers most of the front-end knowledge points and frameworks Front demo website address: Essayshttps://www.xiaosuibi.com/ Background demo website […]
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Time：2021-2-10
Let’s start with a high vote answer from stackoverflow When you execute something synchronously, you wait for it to finish before moving on to another task. When you execute something asynchronously, you can move on to another task before it finishes.When you synchronize a task, you need to wait for it to complete before you […]
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Time：2021-2-6
Index is a very important chapter for MySQL. There are also many knowledge points in the index. If you want to master them thoroughly, you need to break them one by one. Today, let’s talk about the situations that will lead to index failure. Picture summary Full value matching (best index) explain select * from […]
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Time：2021-2-2
Demand causes In web development, we usually need to filter and verify the data from front-end to back-end to prevent attacks such as SQL injection and XSS injection.In Java, the current request (HTTP request) can be repackaged and replaced by inheriting the httpservletrequestwrapper class public class RequestWrapper extends HttpServletRequestWrapper { private String AMP = “&”; […]
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Time：2021-1-31
I’ve been whoring for so many years on the Internet, and now I want to export my humble opinion. I hope it can help you and forge ahead. In more than four years, I have gone from being a rookie to being an independent high-T, and my salary has increased by more than 1000%, more […]
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Time：2021-1-31
What happens when a return error occurs in a rust asynchronous block? This section explains this knowledge point. Examples Source code use futures; async fn foo() { “foo” } fn main() { futures::executor::block_on(foo()); } configuration file [dependencies] futures = “0.3” This example reports an error as follows: error[E0308]: mismatched types –> src/main.rs:20:2 | 20 | […]
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Time：2021-1-31
1. You must not think that learning technology can bring you a stable life and high salary, and you should not think that those who are engaged in market development and running errands have no future. I don’t know if you know that there are quite a large number of software companies in China, and […]
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Time：2021-1-31
preface 2020 is approaching September. Many fans want to have a try! There are also many friends who have asked me for advice. Because my work is relatively stable, I would like to share with you the experience of a fan friend. As a former vegetable chicken interviewer, he grew up in constant failure and […]
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Time：2021-1-27
Java Basics 《Head First Java》 Some people say this book is not suitable for novice programmers? In fact, this book is very suitable for novices who have a little experience to read, of course, it is also suitable for us to review java knowledge. PS: just started programming, the best way is to learn by […]
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Time：2021-1-19
Sort out some IOS interview related questions, continue to update, please pay attention 1. IOS interview questions–Summary of IOS interview questions in 2020 2. IOS interview questions–Memory management of IOS interview 3. IOS interview questions–About Netease Youdao IOS two cool classics 4. IOS interview questions–Ali, byte: a set of efficient IOS interview questions block 5. […]
