Web Front-endJS TutorialSharing examples of specific usage methods of javascript advanced modular require.js
This article mainly introduces the specific usage of JavaScript's advanced modular require.js. It is of great practical value. Friends in need can refer to it. I hope it can help everyone.
Require.js:
RequireJS is a very small javascript module loading framework, which is the best in AMD (Asynchronous Module Definition, asynchronous module loading mechanism) specifications. One of the realizations. The latest version of requireJS is only 14k compressed, which is very lightweight. It can also work in coordination with other frameworks. Using requireJS will definitely improve the quality of our front-end code.
First let’s take a look at a normal page js loading
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script type="text/javascript" src="js/index02.js" ></script>
</head>
<body>
<h1 id="this-nbsp-is-nbsp-a-nbsp-page">this is a page.</h1>
</body>
</html>Running results:
At this time, if we do not operate the pop-up box, the page will not load and there will be no page content. This is not the result we want to achieve.
Below we use require.js to operate:
index.html
##
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script src="js/require2.1.11.js"></script>
<script type="text/javascript">
require(["js/index","js/index01"],function(){
console.log("当js加载成功后会执行的函数");
},function(){
console.log("当js加载失败后会执行的函数");
});
</script>
</head>
<body>
</body>
</html>index.jsdefine(function(){
console.log("this is a test!");
function test(){
console.log("haha,i am a test!");
}
test();
});First of all, test02.js is no longer imported on the page, but requireJS is imported. Secondly, in javascript, we use the require() method and pass an array parameter in it. The actual parameter is [Path + file name of the js file we want to import. The running result at this time:
- require==requirejs, generally using require is shorter.
- define is used to define a module
- require to load dependent modules (referencing the defined modules) and execute the callback function after loading
require(["js/index","js/index01"],function(){
console.log("当js加载成功后会执行的函数");
},function(){
console.log("当js加载失败后会执行的函数");
});
//第一个参数：定义require中的依赖，参数必须是数组形式，即使只有一个依赖，也必须使用数组形式传参。
//第二个参数：是一个回调函数，用来处理加载完毕后的逻辑，当所有模块加载完成后触发
//第三个参数：也是一个回调函数，用来处理模块加载失败后的情况。如上面代码，js中没有定义index01.js这个文件，所以出调用这个回调函数。
Load the network file
Before we All local js files are loaded, but sometimes we need to load files on the network, so how to load them? Let's introduce how to load js files on the Internet.We now take loading a jquery.js file as an example:##
//百度cdn公共库jQuery地址： http://apps.bdimg.com/libs/jquery/2.1.1/jquery.js
//jQuery官方地址： https://code.jquery.com/jquery-3.1.1.js
//注意：网络上去取时不能加后缀，否则取不到
require.config({
paths : {
//为网络上的库去一个名字：jquery
"jquery" : ["https://code.jquery.com/jquery-3.1.1"]
}
});
//
require(["jquery","js/test01","js/test02"],function(){
alert("页面加载成功~~");
},function(){
alert("页面加载失败~~")
});After fetching When using files on the network, please note:
1. The parameter of the config method is an object.
2. The value of paths is also an object.3. When we name the library on the network, it is arbitrary. However, it is recommended to choose a meaningful name. Others can know what your network resources are through the name.
4. The value of the library is an array, which means that multiple writes can be written at the same time to prevent network abnormalities from being accessed.
5 , Special attention: The network resource path cannot have a suffix name, otherwise it will not be fetched
6. We can also fetch it from the network first. If it cannot be fetched, fetch it locally to reduce the pressure on local services (belongs to the project optimization).
require.config({
paths : {
//这样配置，减轻本地服务器的压力
"jquery" : ["https://code.jquery.com/jquery-3.1.1.js","js/jquery-1.8.3"]
}
});
//
require(["jquery","js/test01","js/test02"],function(){
alert("页面加载成功~~");
},function(){
alert("页面加载失败~~")
});Similarly we can also configure local configuration into paths:
require.config({
paths : {
//这样配置，减轻本地服务器的压力
"jquery" : ["https://code.jquery.com/jquery-3.1.1","js/jquery-1.8.3"],
//将本地的js文件同样配置，之后引用
"test01" : ["js/test01"],
"test02" : ["js/test02"]
}
});
//
require(["jquery","test01","test02"],function(){
alert("页面加载成功~~");
},function(){
alert("页面加载失败~~")
});The above example appears repeatedly Without the require.config configuration, if the configuration is added to each page, it will definitely look very inelegant. requirejs provides a function called "master data". We first create a main.js:
require.config({
paths : {
//这样配置，减轻本地服务器的压力
"jquery" : ["https://code.jquery.com/jquery-3.1.1","js/jquery-1.8.3"],
//将本地的js文件同样配置，之后引用
"test01" : ["js/test01"],
"test02" : ["js/test02"]
}
});Then use the following method to use requirejs on the page:
<script type="text/javascript" src="js/require2.1.11.js" ></script>
<script type="text/javascript" src="js/main.js" ></script>
<script type="text/javascript">
require(["jquery","t1","t2"],function(){
alert("页面加载成功~~");
},function(){
alert("页面加载失败~~")
});
</script>Officially provides a method based on tag attributes:
<script data-main="js/main" src="js/require2.1.11.js" ></script>
Put all the configuration and imported js in main.js, so that there is only one tag like this on the page.
The code demonstration is as follows:
//test01.js--定义一个js模块
define(function(){
function test(){
console.log("this is test01.js");
}
test();
$("p").css("color","#DB7093");
});//main.js--requirejs的全局配置
require.config({
paths:{
"jquery":["jquery-1.8.3"],
"test":["test01"]
},
shim:{
"test":["jquery"]
}
});
require(["test"],function(){
console.log("success!");
});//index.html--此时，引入js文件只需一行代码
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script type="text/javascript" data-main = "js/main" src="js/require2.1.11.js" ></script>
</head>
<body>
<p>i am liyanan and this is a testn Page.</p>
</body>
</html>Related recommendations:
The above is the detailed content of Sharing examples of specific usage methods of javascript advanced modular require.js. For more information, please follow other related articles on the PHP Chinese website!
es6数组怎么去掉重复并且重新排序May 05, 2022 pm 07:08 PM去掉重复并排序的方法：1、使用“Array.from(new Set(arr))”或者“[…new Set(arr)]”语句，去掉数组中的重复元素，返回去重后的新数组；2、利用sort()对去重数组进行排序，语法“去重数组.sort()”。
JavaScript的Symbol类型、隐藏属性及全局注册表详解Jun 02, 2022 am 11:50 AM本篇文章给大家带来了关于JavaScript的相关知识，其中主要介绍了关于Symbol类型、隐藏属性及全局注册表的相关问题，包括了Symbol类型的描述、Symbol不会隐式转字符串等问题，下面一起来看一下，希望对大家有帮助。
原来利用纯CSS也能实现文字轮播与图片轮播！Jun 10, 2022 pm 01:00 PM怎么制作文字轮播与图片轮播？大家第一想到的是不是利用js，其实利用纯CSS也能实现文字轮播与图片轮播，下面来看看实现方法，希望对大家有所帮助！
JavaScript对象的构造函数和new操作符（实例详解）May 10, 2022 pm 06:16 PM本篇文章给大家带来了关于JavaScript的相关知识，其中主要介绍了关于对象的构造函数和new操作符，构造函数是所有对象的成员方法中，最早被调用的那个，下面一起来看一下吧，希望对大家有帮助。
JavaScript面向对象详细解析之属性描述符May 27, 2022 pm 05:29 PM本篇文章给大家带来了关于JavaScript的相关知识，其中主要介绍了关于面向对象的相关问题，包括了属性描述符、数据描述符、存取描述符等等内容，下面一起来看一下，希望对大家有帮助。
javascript怎么移除元素点击事件Apr 11, 2022 pm 04:51 PM方法：1、利用“点击元素对象.unbind("click");”方法，该方法可以移除被选元素的事件处理程序；2、利用“点击元素对象.off("click");”方法，该方法可以移除通过on()方法添加的事件处理程序。
整理总结JavaScript常见的BOM操作Jun 01, 2022 am 11:43 AM本篇文章给大家带来了关于JavaScript的相关知识，其中主要介绍了关于BOM操作的相关问题，包括了window对象的常见事件、JavaScript执行机制等等相关内容，下面一起来看一下，希望对大家有帮助。
foreach是es6里的吗May 05, 2022 pm 05:59 PMforeach不是es6的方法。foreach是es3中一个遍历数组的方法，可以调用数组的每个元素，并将元素传给回调函数进行处理，语法“array.forEach(function(当前元素,索引,数组){...})”；该方法不处理空数组。
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
SublimeText3 English version
Recommended: Win version, supports code prompts!
SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.
WebStorm Mac version
Useful JavaScript development tools
SublimeText3 Linux new version
SublimeText3 Linux latest version
MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
