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FileReader gets base64 code of picture and previews it FileReader, to be honest, I'm not familiar with it. It's just a record of usage here. Method name parameter describe abort none Interrupt read readAsBinaryString file(blob) Read file as binary readAsDataURL file(blob) Read file as DataURL readAsText fil ...

Now the web requests data from the server, many of which use Ajax, but they are all wrapped with JQuery. In the previous project, because JQuery cannot be referenced, it can only be used in the native, not to speak much, please see the code. 1 /*-------------------Ajax start--------------------*/ 2 3 function ajax(options) { 4 options ...

Here's a common way for a subcomponent to pass values to its parent. Here is an example of addition and subtraction to explain the principle. As shown in the figure below: The value of the parent component is 0 when there is no operation When the plus sign is clicked, the value of the parent component is 1 When you ...

In the study of JavaScript, we often encounter the event mechanism of JavaScript, such as event binding, event listening, event delegation (event agent), etc. What do these nouns mean and what are their functions? Event binding To make JavaScript respond to user actions, you first bind event handle ...

Transition & Animation of Vue transition When Vue inserts, updates, or removes DOM, it provides a variety of application transition effects. Vue provides a built-in transition encapsulation component that wraps the components to achieve the transition effect. Grammatical format <transition ...

Events in js Events in javascript can be understood as an interactive operation in HTML documents or browsers. 1, How to bind events 1. Inline This mode is the most traditional way to handle events. In the inline model, the event handler is an attribute of the HTML tag that handles the specified e ...

Article directory Preface Import jQuery function library Rotation chart requirement analysis Realization css html Development process html framework development Style development Dynamic page generation summary Preface Last article: Front end learning (3) - jQuery function library The last ...

Responsive layout# I. purpose: the same set of pages can be compatible with devices of different resolutions. 2. Implementation mode: using grid system to achieve: A row is divided into 12 squares. You can set an element to occupy several squares according to the size of the screen. III. steps: Step ...

Functions of three Synchronizers This paper mainly introduces three thread synchronizers, their functions are as follows: CountDownLatch: make sure that all sub threads are summarized after execution. There is a counter inside. After execution of a sub thread, count down and return; CyclicBarrier: a ...

requirement analysis It is required to make a magnifying glass as shown in the figure, with mouse following, turning on and off when right clicking, including transition animation. The general idea is to bind mouse events and dynamically modify the background position. The difficulty lies in that the ...