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Data structure and algorithm (1) array structure I Basic use of arrays Create and initialize arrays It is easy to declare, create, and initialize arrays in JavaScript, as follows: //Create and initialize arrays let daysOfWeek = new Array(); let daysOfWeek = new Array(7); let daysOfWeek = new Array('Sunday','Moday','Tuesday','Wednesday','Thu ...

*Note: This article is to learn the course notes of in-depth JavaScript Advanced Grammar codewhy new course. It is recommended to find the teacher's course in Tencent class for learning. 1,GO AO VO 1.1. The VO in the function is called AO, and the global VO is called GO (earlier, ES5 was not included before ES5): variables and functions de ...

I Initial responsibility chain model Definition: multiple objects have the opportunity to process the request, so as to avoid the relationship between the sender and receiver of the request. Connect the object into a chain and pass the request along a chain until an object processes it. It may be a little obscure. Let's take a look at an exam ...

1, Calculation properties Computed attributes are used to declaratively describe that a value depends on other values. When you bind data to a calculated attribute in the template, Vue will update the DOM when any value it depends on causes the calculated attribute to change. This function is very powerful. It can make your code more ...

Two timers provided by window setTimeout()setInterval() window. SetTimeout (calling function, [number of milliseconds delayed]); The setTimeout() method is used to set a timer. When the delay time is up, the calling function will be executed, and it will end only once. <script> //The delay time is in milliseconds ...

String extraction method slice() substr() substring() Function: returns a substring of the corresponding string, and both receive one or two parameters. Difference: for slice() and substituting(), the first parameter represents the starting position of the substring, the second parameter represents the ending position of the substring extract ...

In the traditional front and back-end development, permission management is mainly carried out through filters or interceptors (the permission management framework itself also realizes the function through filters). If users do not have a role or a permission, they cannot access a page. However, in the separation of front and back ends, the pa ...

This article introduces the usage scenarios of advanced TypeScript types in detail, which can provide some help for the daily use of TypeScript. preface This article has been included in Github: https://github.com/beichensky/Blog In the middle, pass by and point a Star 1, Advanced type & cross type Cross type is to combine multiple typ ...

catalogue Part I: scope and closure Chapter 1. What is the scope Chapter 2} lexical scope Chapter 3 function scope and block scope Chapter 4 - lifting Chapter 5: scope closure The second part is} this and object model Chapter 1} about this Chapter 2} this comprehensive analysis Chapter 3: object Chapter 4} mixed object "class&qu ...

Updated from time to time, only for notes   catalogue 1, Comparison of var, let and const 2, Cookie, localStorage, sessionStorage comparison 3, String connection 1. Use connector "+" 2. join method using array 3. Use the template string backquote ` 'of ES6 4. Using concat method 4, JS operator 1. Non air operat ...