Programmer Group

1. isStatic: Detecting whether the data is original except symbol s function isStatic(value) { return( typeof value === 'string' || typeof value === 'number' || typeof value === 'boolean' || typeof value === 'undefined' || value === null ) } 2. isPrimitive: Detecting whether the data is ...

When it comes to react, the first thing we think of should be components. In react's eyes, everything is components. Even axios, which we use to get data, can be represented by components... for example, we can encapsulate them in this way. <Request instance={axios.create({})} /* custom instance of axios - optional */ method="" /* get, d ...

Episode 4: Implementation from scratch (button component 2) Location of this episode: I've been busy with other things before, but now I'm finally free to write about this library. The purpose of this article is to carry on the above and realize the function of button component. 1: Add icon to button The icon of the button is very important ...

Push TechnologyBy establishing a long connection between the client and the server, the client can receive messages sent by the server from time to time. (1) polling method based on ajax: Using JQuery encapsulated $. ajax to build polling is shown below, and the polling is conducted every five seconds, regardless of whether the request is succe ...

We propose two solutions for watermarking project 1. Implementation with shadow dom 1. Basic Ideas By attach Shadow, a shadow root node is generated, and then a watermarking is added under the root node through a circular statement. The position is used to layout the absolute and make it full of containers.  show me the code: (function (ro ...

Selector defined in CSS1 Type Selectors Used to select an element of a specified type (in fact, it is the html tag selector), the common usage is as follows: body { /*Define styles for body elements*/ } body,div { /*Choose multiple label elements at the same time*/ } ID selector The html elements used to select the specified ID are as ...

The sample code is hosted in: http://www.github.com/dashnowords/blogsBlog Garden Address: The original bibliography of Dashi Living in the Big Front End Huawei Cloud Community Address: [Guidelines for Upgrading Your Front-end Crackers] [TOC] I. Mission Statement Using the native canvas API to draw a water polo map will be an interesting chall ...

Page Layout Solution Centralized layout horizontally The child element is in the middle relative to the parent element and the width of the child element is variable. In addition to other declarations, the HTML structure is as follows: <div class="parent"> <div class="child">Demo</div> </div> inline-block + text-alig ...

brief introduction Drag-and-drop is a common feature, which is to drag an object to another location after grabbing it. In HTML5, drag and drop is part of the standard, and any element can be dragged and dropped. First click on a small example: execute JavaScript when the user starts dragging < p > elements <p draggable="true" ondragst ...

FormData brief introduction XMLHttpRequest Level 2 adds a new interface FormData. Using FormData objects, we can use JavaScript to simulate a series of form controls with some key-value pairs. We can also use the send() method of XMLHttpRequest to submit this "form" asynchronously. Compared with ordinary ajax, the greatest advantage o ...