Programmer Think

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 ...

Today, I will summarize the verification problems of complex forms. After learning, they can be directly used in actual development. I believe they will be helpful to you in actual projects. We all know that the elementUI component library has been improved. Today, let's take a look at its common form components. Generally, form modules that me ...

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 ...

1, Understand 1. Pre description React itself only focuses on the interface and does not contain the code to send ajax requestsThe front-end application needs to interact with the background through ajax requests (json data)Third party ajax libraries (or self encapsulation) need to be integrated in React applications 2. Common ajax req ...

Cross domain The principle of cross domain is: the same domain is only when the protocol, domain name and port are the same. Otherwise, it is cross domain. Cross domain means that the browser does not allow the source of the current page to request data from another source Homology Another concept is homology. Homology refers to the sam ...

jQuery video through train from getting started to becoming proficient:         JQuery video tutorial, from introduction to actual combat, interactive actual combat between native ajax and jQuery ajax, easy to understand! Getting started with jQuery jQuery download and import jQuery Download Official website address: jQuery Official A ...

We all know the direction of this: Always adhere to a principle: this always points to the object that was invoked at last, because the object of calling function is different, which leads to the different direction of this. However, the direction of this can be changed by using call apply bind: call method Syntax: fun call(thisArg, arg1, ...

prefaceIf your understanding of prototype and prototype chain is still at a very shallow and ambiguous stage, you might as well take a look at my article. It should be helpful to you. If it is so helpful to you, you are welcome to praise, comment and forward. If you have questions and doubts, you can also leave a message in the comment area. I ...

Algorithm classification Comparison sort: the relative order between elements is determined by comparison. Because its time complexity cannot exceed O(nlogn), it is also called nonlinear time comparison sort.Non comparison sort: it does not determine the relative order between elements through comparison. It can break through the time lowe ...