Web Front-end
JS Tutorial
A detailed introduction to multi-valued motion in the JavaScript motion framework (4)
A detailed introduction to multi-valued motion in the JavaScript motion framework (4)
This article mainly introduces JavaScriptMotionFrameworkThe fourth part, multi-value movement, has certain reference value. Interested friends can refer to it.
Multi-valued motion, that is, for a certain object, not only one of the attribute values is changing, but several, such as width, height , font, transparency, etc. change simultaneously
Of course, multi-value movement will cause a problem, which is the problem of timerwhen to turn off! Of course, the timer can only be cleared when all attribute values have moved to the target value, that is, waiting for the slowest one. It's like ten people having a dinner together. You can't wait until one person arrives to start eating!
The previous articles talked about the movement of a certain attribute in an element object. This time we talked about the buffer movement of multiple attribute values in the same element object. Then each attribute has an end point. (Target point), we write these attributes and their target values in the form of an object, or in the form of json! The problem that easily arises is as mentioned above. The common speedfunction is used here, but some attribute values are from 100 –> 101, and some attribute values are from 100 –> 600. You have to wait. Only when the longest attribute value reaches the target value can the timer owned by the obj be turned off. The design idea is to set a bStob = true each time the polling function is executed; when traversing and scanning the attributes in json, as long as the target value is not reached, The value attribute is set to false, so that the timer will not be turned off. Even if some attribute values have reached the end point, the polling will still perform scanning at this time, but at this time the movement speed of the attribute is 0, and it will not Got some exercise. That is, before:
if(attr == cur) {
cleartInterval(obj.timer);
}will be enhanced to:
if (bStop) {
clearInterval(obj.timer);
}<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>运动框架(四)：多值运动</title>
<style type="text/css">
p {
width: 100px;
height: 100px;
background: orange;
margin: 10px;
float: left;
}
</style>
</head>
<body>
<p id="p1"></p>
<script type="text/javascript">
var op = document.getElementById('p1');
op.onmouseover = function() {
var json = {
width: 600,
height: 200,
opacity: 30
};
startMove(this, json);
};
op.onmouseout = function() {
var json = {
width: 100,
height: 100,
opacity: 100
};
startMove(this, json);
};
function getStyle(obj, attr) {
if (obj.currentStyle) {
return obj.currentStyle[attr];
} else {
return getComputedStyle(obj, false)[attr];
}
}
function startMove(obj, json) {
clearInterval(obj.timer);
obj.timer = setInterval(function() {
var bStop = true;
for (var attr in json) {
var cur = 0;
if (attr === 'opacity') {
cur = Math.round(parseFloat(getStyle(obj, attr)) * 100);
} else {
cur = parseInt(getStyle(obj, attr));
}
var speed = (json[attr] - cur) / 10;
speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed);
if (cur != json[attr]) {//凡是有未到达目标点的，一律不让定时器停下，否则有的属性不能到达目标值
bStop = false;
}
if (attr === 'opacity') {
cur += speed;
obj.style.filter = 'alpha(opacity:' + cur + ')';
obj.style.opacity = cur / 100;//Chrome,IE
} else {
obj.style[attr] = cur + speed + 'px';
}
}
//整个循环结束后，仍然保持着true，说明没有没到达目标值的属性，也就是都到了
if (bStop) {
clearInterval(obj.timer);//说明所有的属性都到达了目标值
}
}, 30);
}
</script>
</body>
</html>
The above is the detailed content of A detailed introduction to multi-valued motion in the JavaScript motion framework (4). For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1377
52
How to implement an online speech recognition system using WebSocket and JavaScript
Dec 17, 2023 pm 02:54 PM
How to use WebSocket and JavaScript to implement an online speech recognition system Introduction: With the continuous development of technology, speech recognition technology has become an important part of the field of artificial intelligence. The online speech recognition system based on WebSocket and JavaScript has the characteristics of low latency, real-time and cross-platform, and has become a widely used solution. This article will introduce how to use WebSocket and JavaScript to implement an online speech recognition system.
WebSocket and JavaScript: key technologies for implementing real-time monitoring systems
Dec 17, 2023 pm 05:30 PM
WebSocket and JavaScript: Key technologies for realizing real-time monitoring systems Introduction: With the rapid development of Internet technology, real-time monitoring systems have been widely used in various fields. One of the key technologies to achieve real-time monitoring is the combination of WebSocket and JavaScript. This article will introduce the application of WebSocket and JavaScript in real-time monitoring systems, give code examples, and explain their implementation principles in detail. 1. WebSocket technology
How to use JavaScript and WebSocket to implement a real-time online ordering system
Dec 17, 2023 pm 12:09 PM
Introduction to how to use JavaScript and WebSocket to implement a real-time online ordering system: With the popularity of the Internet and the advancement of technology, more and more restaurants have begun to provide online ordering services. In order to implement a real-time online ordering system, we can use JavaScript and WebSocket technology. WebSocket is a full-duplex communication protocol based on the TCP protocol, which can realize real-time two-way communication between the client and the server. In the real-time online ordering system, when the user selects dishes and places an order
How to implement an online reservation system using WebSocket and JavaScript
Dec 17, 2023 am 09:39 AM
How to use WebSocket and JavaScript to implement an online reservation system. In today's digital era, more and more businesses and services need to provide online reservation functions. It is crucial to implement an efficient and real-time online reservation system. This article will introduce how to use WebSocket and JavaScript to implement an online reservation system, and provide specific code examples. 1. What is WebSocket? WebSocket is a full-duplex method on a single TCP connection.
JavaScript and WebSocket: Building an efficient real-time weather forecasting system
Dec 17, 2023 pm 05:13 PM
JavaScript and WebSocket: Building an efficient real-time weather forecast system Introduction: Today, the accuracy of weather forecasts is of great significance to daily life and decision-making. As technology develops, we can provide more accurate and reliable weather forecasts by obtaining weather data in real time. In this article, we will learn how to use JavaScript and WebSocket technology to build an efficient real-time weather forecast system. This article will demonstrate the implementation process through specific code examples. We
Simple JavaScript Tutorial: How to Get HTTP Status Code
Jan 05, 2024 pm 06:08 PM
JavaScript tutorial: How to get HTTP status code, specific code examples are required. Preface: In web development, data interaction with the server is often involved. When communicating with the server, we often need to obtain the returned HTTP status code to determine whether the operation is successful, and perform corresponding processing based on different status codes. This article will teach you how to use JavaScript to obtain HTTP status codes and provide some practical code examples. Using XMLHttpRequest
How to use insertBefore in javascript
Nov 24, 2023 am 11:56 AM
Usage: In JavaScript, the insertBefore() method is used to insert a new node in the DOM tree. This method requires two parameters: the new node to be inserted and the reference node (that is, the node where the new node will be inserted).
How to get HTTP status code in JavaScript the easy way
Jan 05, 2024 pm 01:37 PM
Introduction to the method of obtaining HTTP status code in JavaScript: In front-end development, we often need to deal with the interaction with the back-end interface, and HTTP status code is a very important part of it. Understanding and obtaining HTTP status codes helps us better handle the data returned by the interface. This article will introduce how to use JavaScript to obtain HTTP status codes and provide specific code examples. 1. What is HTTP status code? HTTP status code means that when the browser initiates a request to the server, the service
