Programmer Think

A web server is created through Koa and can respond to different pages according to different user request paths. However, the content of each page is sent to the browser in the form of string. This development method is not friendly. We prefer to send html pages directly. The template engine can solve this problem. Through the template engine ...

This is some basic content of JavaScript events previously sorted out. 1, The origin of the event With the rapid development of the Web, the static page of HTML+CSS can no longer meet the needs of users, so there is JavaScript that allows users to interact with the browser, and the great hero to realize this function is what we are talking ab ...

1, Cognitive object An object is a collection of "key value pairs", which represents the mapping relationship between attributes and values. var xiaoming = { name: 'Xiao Ming', age: 12, sex: 'male', hobbies: ['Football', 'programming'] }; Attribute name (key): attribute value (value) In JS, braces represent o ...

Cross domain What is cross domain The browser has a homology policy. When the 'protocol name', 'domain name' and 'port' of the url of the web page are the same, it is homology. One difference is cross domain Homology strategy The same origin policy restricts documents or scripts loaded from the same source, such as songs, from interacting with ...

preface Nowadays, many web pages can actually be regarded as function rich applications, which have complex JavaScript code and a lot of dependency packages. Modularity allows us to refine complex programs into small files; Similar to TypeScript, a development language developed on the basis of javascript: it enab ...

1, What are expressions and operators Expression: an expression consisting of operands and operators. Classification of expressions: arithmetic, relation, logic, assignment and synthesis. 2, Arithmetic expression 2.1 arithmetic operators significanceoperatorplus+reduce-ride*except/Surplus% It is recommended to use () to enforce prio ...

1, redux understanding 1. Learning documents English documents: https://redux.js.org/Chinese documents: http://www.redux.org.cn/Github: https://github.com/reactjs/redux 2. What is redux redux is a JS library dedicated to state management (not a react plug-in library).It can be used in react, angular, vue and other projects, but it is ba ...

prefaceHello, I'm Lin Sanxin. Clearing the float is the most frequently asked question in CSS during the interview. When the interviewer asks you how to clear the float, he certainly doesn't want you to simply answer the method of clearing the float, but wants you to answer the BFC. Even if he doesn't want you to answer, you should take the ini ...

1. Install Logstash 1.1 problems This case requires: Create a virtual machine and install logstashMinimum configuration: 2cpu, 2G memory, 10G hard diskVirtual machine IP: 192.168.1.47 logstash 1.2 steps To implement this case, you need to follow the following steps. Step 1: install logstash 1) Configure the host name, ip and yum so ...

1, What is an array Array, as its name implies: the type used to store a set of related values. Array can easily sum a group of values, calculate the average value, traverse item by item and so on. var scoreArr = [87, 89, 93, 71, 100, 68, 94, 88]; Array names are used to end with Arr. 2, Definition of array 2.1 square bracket de ...