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Common methods of arrays Array.length length is an instance property of Array that returns the number of elements in the array and is always greater than the subscript of the last item in the array let arr = [1, 2, 3, 4] console.log(arr.length) // 4 indexOf indexOf('ele',fromIndex) Parameter 1: Elements of the query Parameter 2 (optional) ...

1. Concise representation of attributes (1) Properties and methods /*It is allowed to directly use variables inside the object (i.e. attribute and attribute value variables are consistent, which can be abbreviated)*/ let name='Zhang San'; let stu={ name, //Equivalent to //name:name sleep(){}, ...

Anti chattering and throttling are events that prevent high frequency triggering Anti shake, generally used in Onresize event (onresize: execute Javascript code when the browser is resized) oninput event: triggered upon user input. If the event is triggered with high frequency, it is likely to cause the server to crash Then you can use the ...

Scripting language: it can be parsed and executed by the browser without compilation Overview of Wed concept JavaWed: Using java language to develop Internet based projects Software architecture: 1. C/S: Client / Server * There is a client program locally and a server program remotely * For example: QQ,Thunder... * Advantage ...

Chapter 1 JavaScript Basics 1. What is JavaScript? HTML+CSS completes the static page display, but to complete better and more complex user interaction and data interaction and display, you need to use JavaScript. JavaScript is an object-based and event driven scripting language with security performance 2. Features of JavaScript a. You can add ...

If you want to be a good java Architect, here → Le byte free open class (Tencent class) If you need to follow more information, please click on the right side (remember the password: 66) → This is a no return road, there is a risk of baldness, please choose carefully! BOM objects The core object of BOM is window, which represents an i ...

Article catalog Front end development VSCode Initial settings 1. Chinese interface configuration 2. Plug in installation 3. Create project 4. Save workspace 5. New folders and pages 6. Preview web page 7. Set font ...

ES6 Syntax target Ability to say the characteristics of using let keywords to declare variables Ability to extract values from arrays using deconstruction assignments Ability to say what an arrow function has Ability to receive remaining function parameters using remaining parameters Ability to spl ...

catalog preface class is a special function How class works Prototype chain relation of class inheritance reference resources 1. Preamble The JavaScript class introduced in ECMAScript 2015 (ES6) is essentially the existing prototype based inherited syntax sugar of JavaScript. Class syntax does not introduce a new object-oriented in ...

json What is JSON JSON(JavaScript Object Notation) is a lightweight data exchange format. It is based on ECMAScript A subset of. JSON uses a completely language independent text format, but also uses habits similar to the C language family (including C,C++,C#,Java,JavaScript,Perl,Python Etc.). These features make JSON an ideal data exchange l ...