[H5-compress-image] using canvas to implement JavaScript image compression processing _ Code implementation based on Requirejs modularization

There is also the problematic code, the problem is that the processfile ()Problem: Under Ipone 5c, some image compression processing, uploaded to the server generated file size is 0, that is, blank; define ([' mod/tool/formsubmit '), function

JavaScript: Understanding Try...catch...finally

Before, I always like to use Console.log (do some thing) to perform the output type and value, want to see the popup immediately, it will be directly in the browser alert (), these are the basics.A little more complex, it is necessary to use the

[Leetcode] [JavaScript] Reverse Linked List II

Reverse Linked List IIReverse a linked list from position m to N. Do it in-place and in One-pass.For example:Given 1->2->3->4->5->NULL , m = 2 and n = 4,Return 1->4->3->2->5->NULL .Note:Given m, n satisfy the following condition:1 ≤ m ≤ n ≤length of

Javascript random number int range one number float

1. Randomly take an int range of one number, such as 0-3 to take 0,1,2,3, including 0 and 3Common error notation:because the range of Javascirpt math.random () is [0,1], contains 0, does not contain 1, the error is written, because Math.floor is

JavaScript learns-JS's Date object function

The date function of JS is very powerful. Usually used.First get the current date:var curdate = new Date (), var year = Curdate.getfullyear (); Year (four-digit example:) var Month = Curdate.getmonth () +1; Month 0~11var day = Curdate.getdate ();

JavaScript basic Syntax (introduction, script tag, strict mode, reserved word keyword)

Introduction[1] Definition: A scripting language designed to interact with Web pages, which is interpreted programming language.[2] Composition:[2.1] ECMAScript is defined by ECMA-262 and provides core language functionality (ECMA is the European

JavaScript implements the private, protected, public, static, and inheritance of classes

Classes in JavaScriptJavaScript is actually a weakly typed language, unlike languages such as C + + and Java. So, in JavaScript, there is no concept of class, but in practice, classes are important, such as writing a game, what would it be like if

Dom manipulation of JavaScript

1. DOM the basic conceptHtmldom is a model of an object-oriented tree that contains all the elements in the HTML, and all the elements contained in the DOM can be found through HTML.The DOM is the Document Object model, which is a tree model; a

Underscore source code analysis, underscore source code

Underscore source code analysis, underscore source code Some people said a few years ago that javascript is the most undervalued programming language. Since the emergence of nodejs, the concept of Full-end (All Stack/Full Stack) has gradually

Based on jquery, move the slider to the left and right for source code download,

Based on jquery, move the slider to the left and right for source code download, Before entering the text, paste it to you to see if you want the effect: Download demo source code online The code for setting the slider Based on jQuery. This is a

Window. location. reload refresh use analysis (go to the dialog box), window. location refresh

Window. location. reload refresh use analysis (go to the dialog box), window. location refresh When you use window. location. reload; to refresh, if you submit data, an annoying dialog box is displayed! To solve this problem, write as follows:

Add font and color styles ------- CSS and font styles ------- css

Add font and color styles ------- CSS and font styles ------- cssControls the font, style, and color of text by using CSS. 1. Basic operations:   1 body{ 2 font-family: Verdana, Geneva, Tahoma, sans-serif 3 } 4 5 body{ 6 font-size: 14px 7

JQuery implements the code of the webpage customer service effect suspended in the upper right corner. jquery Customer Service

JQuery implements the code of the webpage customer service effect suspended in the upper right corner. jquery Customer Service This article describes the code for jQuery to implement the effect of browser customer service suspended in the upper

The JavaScript -- Item11 arguments object you don't know

The JavaScript -- Item11 arguments object you don't know1. What is arguments? Arguments is a built-in object in JavaScript. It is odd and often overlooked, but it is actually very important. All major js function libraries use the arguments object.

Brief Introduction to node. js version control nvm and n, node. jsnvm

Brief Introduction to node. js version control nvm and n, node. jsnvm Today's topic includes two parts 1. Use nvm or n for version control under node. js2. After the node. js version is installed on nvm, restart the terminal node. The npm

The complete tutorial (background-position application) for CSS to take a thumbnail from a large image) and backgroundposition

The complete tutorial (background-position application) for CSS to take a small image from a large image (conversion) and backgroundposition I think that the application of background-position is very easy to understand. Make a mark. I believe that

Js implements awesome photo wall display renderings with source code download and js source code download

Js implements the download of the awesome photo wall display source code and js source code This is a cool photo wall display effect. Many photos are combined with fade-in and fade-out, rotation, scaling, skew, and 3D effects. The photos are quickly

JS implements code for the elastic menu effect, and js implements the elastic code

JS implements code for the elastic menu effect, and js implements the elastic code This article describes the code for JS to implement the elastic menu effect. Share it with you for your reference. The details are as follows: This is an elastic menu

HTML5 application clock and html5 clock

HTML5 application clock and html5 clock Using the Canvas API of HTML5, we can achieve unexpected animation effects. Before we wanted to place a clock on the webpage, we had to use flash tools to create a clock and write complex JavaScript code, and

Emmet: Quick coding of HTML/CSS code, emmetcss

Emmet: Quick coding of HTML/CSS code, emmetcss 1. Introduction to Emmet The predecessor of Emmet is Zen Coding, which uses the syntax of the CSS selector to generate code, greatly improving the speed of HTML/CSS code writing. It consists of two core

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