Web Front-end
JS Tutorial
The case of js thread - realizing the typewriter effect of random speed
The case of js thread - realizing the typewriter effect of random speed
Directory
Directory
Random speed Typewriter effect
Effect
Code
Knowledge cited Click
Use timer to trigger thread
Use event to trigger thread
Thread
Random number
Quick link
Random speed typewriter effect
Effect
Code
html part
<!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8">
<title>typeWriter</title>
<style type="text/css">
h2,h5,#tooltipMsg,p{ white-space: nowrap; }
td{ border: 1px solid #ccc; height: 50px; text-align: center; font-size: 10pt; padding: 2px; }
</style></head><body>
<h2 id="实现打字机效果">实现打字机效果</h2>
<p id="typeWriterEffect"></p>
<p id="typeWriterEffect2"></p>
<script type="text/javascript" src="typeWriter.js"></script></body></html>js part
window.onload=function(){
var twArr = [],//打字的数据库队列
twing = false,//用于判断打字机的线程是否开启
twID = [],//打字机线程ID
twTime = 10,//用于定时调用的时间
obj1 = document.getElementById("typeWriterEffect"),
obj2 = document.getElementById("typeWriterEffect2"),
twEffect = function(e,str){//添加显示的元素
twArr.push({ "context":e,//目标元素上下文
"str":str,//显示的元素
"lening":0,//截取的进度
"maxL":str.length//最大的进度
})
},
closeTw = function(){//关闭定时调用
clearTimeout(twID);//关闭线程
twing = true;
},
twUi = function(){//定时调用
var i = 0,
L = twArr.length,
eing = null; for (var i = 0; i < L; i++) {
eing = twArr[i]//效果同时加载多对象数组
eing.lening++; if (eing.lening>eing.maxL) {//不设置关闭线程则打字效果循环
eing.lening = 0;
}
eing.context.innerHTML = eing.str.substring(0,eing.lening)+"_";
} var num = Math.floor(Math.random()*50+1);//1-50个随机数
console.log(num);
twID = setTimeout(twUi,num*twTime);//开启线程
if(twID==eing.maxL){//到达最后关闭线程
closeTw();
}
}, //开启定时调用，参数为设置定时调用的时间
startTw = function (twTime) {
if (!twing) {//如果没有开启才开启
twTime = twTime;
twUi();//开始定时调用
}
}; //设置内容对象数组
twEffect(obj1,"这就是打字机效果,打字速度随机哦！！！！！"); //开始调用线程
startTw(twTime);
}Knowledge points cited
Thread
JS’s single threaded (single threaded) and asynchronous (asynchronous), but they are not contradictory to each other, js host environment (For example, browsers, Node) are multi-threaded, and the host environment makes js have asynchronous properties in some way.
setTimeout(function(){
console.log(time is out);
}，50）;Some people will ask about the difference between timer setTimeout and setinterval:
setTimeout (table delay time) is executed when After loading and delaying the specified time, only executes the expression once,
and setInterval (table interaction time) is different. It executes every specified time after loading. One-time expression
Use timer to trigger thread
(Disadvantage: high coupling)
function f1(callback){setTimeout(function(){
// f1 的代码
callback();
},0);
}
f1(f2);Use event to trigger thread
(Disadvantage: You can implement different callback functions by binding different events. If you apply this method too much, it will not be conducive to reading the program)
$f1.on('custom',f2); //这里绑定事件以jQuery写法为例function f1(){setTimeout(function(){
// f1的代码
$f1.trigger('custom');
},0);
}Random number
Math.random() Take a random number from 0-1
Similarly expand the example:
Math.random()*10Take a random number from 0-10 (including a lot of decimal points)
Math.random()*10 1 takes a random number of 1-10
Math.random()*10 2 takes a random number of 2-10
Math.random()*899 100 takes a random number of 100-999
Commonly used: Math.floor()Only take the integer part of the random number
Related articles:
Complete example of typewriter effect implemented by JS
Typewriter effect sample code implemented by JS
Related videos:
Achieve full-screen switching effect practical video tutorial
The above is the detailed content of The case of js thread - realizing the typewriter effect of random speed. 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
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
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
What should I do if I encounter garbled code printing for front-end thermal paper receipts?
Apr 04, 2025 pm 02:42 PM
Frequently Asked Questions and Solutions for Front-end Thermal Paper Ticket Printing In Front-end Development, Ticket Printing is a common requirement. However, many developers are implementing...
Demystifying JavaScript: What It Does and Why It Matters
Apr 09, 2025 am 12:07 AM
JavaScript is the cornerstone of modern web development, and its main functions include event-driven programming, dynamic content generation and asynchronous programming. 1) Event-driven programming allows web pages to change dynamically according to user operations. 2) Dynamic content generation allows page content to be adjusted according to conditions. 3) Asynchronous programming ensures that the user interface is not blocked. JavaScript is widely used in web interaction, single-page application and server-side development, greatly improving the flexibility of user experience and cross-platform development.
Who gets paid more Python or JavaScript?
Apr 04, 2025 am 12:09 AM
There is no absolute salary for Python and JavaScript developers, depending on skills and industry needs. 1. Python may be paid more in data science and machine learning. 2. JavaScript has great demand in front-end and full-stack development, and its salary is also considerable. 3. Influencing factors include experience, geographical location, company size and specific skills.
How to merge array elements with the same ID into one object using JavaScript?
Apr 04, 2025 pm 05:09 PM
How to merge array elements with the same ID into one object in JavaScript? When processing data, we often encounter the need to have the same ID...
Is JavaScript hard to learn?
Apr 03, 2025 am 12:20 AM
Learning JavaScript is not difficult, but it is challenging. 1) Understand basic concepts such as variables, data types, functions, etc. 2) Master asynchronous programming and implement it through event loops. 3) Use DOM operations and Promise to handle asynchronous requests. 4) Avoid common mistakes and use debugging techniques. 5) Optimize performance and follow best practices.
How to achieve parallax scrolling and element animation effects, like Shiseido's official website?
or:
How can we achieve the animation effect accompanied by page scrolling like Shiseido's official website?
Apr 04, 2025 pm 05:36 PM
Discussion on the realization of parallax scrolling and element animation effects in this article will explore how to achieve similar to Shiseido official website (https://www.shiseido.co.jp/sb/wonderland/)...
The Evolution of JavaScript: Current Trends and Future Prospects
Apr 10, 2025 am 09:33 AM
The latest trends in JavaScript include the rise of TypeScript, the popularity of modern frameworks and libraries, and the application of WebAssembly. Future prospects cover more powerful type systems, the development of server-side JavaScript, the expansion of artificial intelligence and machine learning, and the potential of IoT and edge computing.
The difference in console.log output result: Why are the two calls different?
Apr 04, 2025 pm 05:12 PM
In-depth discussion of the root causes of the difference in console.log output. This article will analyze the differences in the output results of console.log function in a piece of code and explain the reasons behind it. �...
