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What is angularJs? Introduction to angularjs (selected version)

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2018-09-08 15:13:491551browse

This article mainly introduces an introduction to angularjs, angularjs extends HTML, and an introduction to angularjs instructions, expressions, and applications. Now let’s take a look at this article together

Introduction to AngularJS

1 What is AngularJS?

AngularJS makes it easier to develop modern single page applications (SPAs: Single Page Applications).

  • AngularJS binds application data to HTML elements.

  • AngularJS can clone and repeat HTML elements.

  • AngularJS can hide and show HTML elements.

  • AngularJS can add code "behind" HTML elements.

  • AngularJS supports input validation.

AngularJS is a JavaScript framework. It can be added to HTML pages via the <script> tag. </script>

AngularJS extends HTML through Directives and binds data to HTML.

AngularJS is a JavaScript framework. It is a library written in JavaScript.


AngularJS is published as a JavaScript file, which can be added to web pages through the script tag:

scriptsrc="http://cdn.static.runoob.com/libs/angular.js/ 1.4.6/angular.min.js">script>This will improve page loading speed because HTML loading is not subject to script loading.

Download each angular.js version: https://github.com/angular/angular.js/releases

2 AngularJS extends HTML

AngularJS Pass ng-directives Extends HTML. The

ng-app directive defines an AngularJS application.

ng-model directive binds element values ​​(such as input field values) to the application.

ng-bind directive binds application data to an HTML view.

3 AngularJS Directives

As you can see, AngularJS directives start with ng HTML attribute as prefix.

ng-init directive initializes AngularJS application variables. 

<png-app=""ng-init="firstName=&#39;John&#39;">
<p>姓名为<spanng-bind="firstName"></span></p>
</p>
What is angularJs? Introduction to angularjs (selected version)We recommend placing the script at the bottom of the element.
#HTML5 allows extended (homemade) attributes to ## It starts with #data-

4 AngularJS 表达式

AngularJS 表达式写在双大括号内：{{ expression }}。

AngularJS 表达式把数据绑定到 HTML，这与 ng-bind 指令有异曲同工之妙。

AngularJS 将在表达式书写的位置"输出"数据。

AngularJS 表达式 很像 JavaScript 表达式：它们可以包含文字、运算符和变量。

实例 {{ 5 + 5 }} 或 {{ firstName + " " + lastName }}

<!DOCTYPEhtml>
<html>
<head>
<metacharset="utf-8">
<scriptsrc="http://cdn.static.runoob.com/libs/angular.js/1.4.6/angular.min.js"></script></head>
<body>
<png-app=""><p>我的第一个表达式：
 {{ 5 + 5 }}</p></p>
</body>
</html>

5 AngularJS 应用

AngularJS 模块（Module） 定义了 AngularJS 应用。

AngularJS 控制器（Controller） 用于控制 AngularJS 应用。

ng-app指令定义了应用, ng-controller 定义了控制器。（想看更多就到PHP中文网AngularJS开发手册中学习）

png-app="myApp"ng-controller="myCtrl"> 名: inputtype="text"ng-model="firstName">br>姓:inputtype="text"ng-model="lastName">br>br>姓名: {{firstName " " lastName}}p>##script>var app = angular.module('myApp', []);app.controller('myCtrl', function($scope) { $scope.firstName= "John"; $scope.lastName= "Doe";});script>

AngularJS module definition application:

var app =angular.module('myApp',[]) ;

AngularJS controller control application:

app.controller('myCtrl',function($scope) { $scope.firstName="John"; $scope.lastName="Doe" ;});

This article ends here (want to see more Just go to the PHP Chinese website AngularJS User Manual to learn). If you have any questions, you can leave a message below.

What is angularJs? Introduction to angularjs (selected version). AngularJS attributes start with ng-
, but you can use data-ng- to make the page valid for HTML5.

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