js base64 and canvas base64
1, js base64
Get the uploaded file myfile, create a fileRead file object, and use the readAsDataURL method to encode the read file into a Data URL. After the file is loaded successfully, e.target.result is the base64 encoding corresponding to the file image. The image can be displayed by assigning the src of img directly.
<body>
& ...
Posted by hardius on Fri, 01 May 2020 14:42:21 -0700
Using Tencent location service for mobile location
1. First, write a tool class to locate the function in common.js
common.js:
//Location service function entry
function getLocationInfo() {
if (localStorageUtils.acquireLocationInfo() == null ||localStorageUtils.acquireLocationInfo().curLongitude == null || localStorageUtils.acquireLocationInfo().curLatitude == null) {
getCurrentL ...
Posted by bradles on Fri, 01 May 2020 13:19:07 -0700
Three.js promotion learning 2: building the basic components of three.js scenario
The learning content of this article comes from Three.js Development Guide: JavaScript 3D Library of WebGL
Create scene
There are three types of components needed for a scenario to display anything:
assembly
Explain
video camera
Decide what needs to be rendered on the screen
light source
Determines how materials are displayed a ...
Posted by johnc71 on Fri, 01 May 2020 10:18:30 -0700
2018-01-06 deep copy and shallow copy of javascript
catalog:
What is replication?
A simple shallow copy
An example of deep replication
Several general methods of deep and shallow replication
Deep copy
What is replication?
Simple variable replication, small memory, we can directly copy without reference.
First, deep copy and shallow copy are only for complex objects such as object and arra ...
Posted by kcorless on Fri, 01 May 2020 08:28:23 -0700
Object traversal method
Different return values of different methods traversing objects
Pre Code:
function Obj() {
// Add properties directly on this
this.prop_this = 'prop_this';
// Add symbol attribute on this
this[Symbol.for('prop_symbol')] = 'prop_symbol';
}
// Add attribute on Prototype
Obj.prototype.propProto ...
Posted by kenle on Fri, 01 May 2020 04:13:47 -0700
Example used by JSONP and artTemplate template template engine -- request weather data
Example used by JSONP and artTemplate template template engine - Request weather data The first two articles briefly summarize The principle of cross domain request in jsonp , and The use of artTemplate template engine . So make a simple example of requesting weather.
I don't know why. Yesterday's request for Baidu ...
Posted by praxiz on Fri, 01 May 2020 00:19:29 -0700
vue can't use El input of element UI to monitor the carriage return event
From: http://blog.csdn.net/u014520745/article/details/71746343
Only for learning, not for business!!!
vue can't use El input of element UI to listen to the carriage return event. The reason is that the original event is hidden after the element UI itself encapsulates a layer of input tag. Therefore, the following code runs unresponsive: ...
Posted by johlwiler on Thu, 30 Apr 2020 17:33:46 -0700
Source code analysis of v-1.8.2 under core
V-1.8.2 source code analysis of anderscore (2)
if(typeof exports !== "undefined") {
if(typeof module !== "undefined" && module.exports) {
exports = module.exports = _;
}
exports._ = _;
} else {
root._ = _;
}
Assign the local variable defined above to the property in the global objec ...
Posted by crackfox on Thu, 30 Apr 2020 11:59:38 -0700
Basic use of AMD - requireJS in JavaScript modular programming
AMD of JavaScript modular programming
requireJS basic use
Tags (space delimited): JavaScript
Reference article
AMD specification
AMD is the abbreviation of "Asynchronous Module Definition", which means "Asynchronous Module Definition". It loads the module asynchronously, and the loading of the module does not affect the ru ...
Posted by nlhowell on Thu, 30 Apr 2020 07:59:20 -0700
Simple learning of JavaScript (Collection 1) tutorial, introduction, usage, output
Collection 1 tutorial, introduction, usage
Catalog
Introduction to the collection 1 tutorial usage
Catalog
1 tutorial
2 Introduction
3 usage
1 tutorial
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Rookie tutorial(runoob.com)</title>
<script>
f ...
Posted by mr_zog on Thu, 30 Apr 2020 00:10:55 -0700