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How to use angularjs services? Specific introduction to the use of angularjs services

寻∝梦Original: 2018-09-08 11:54:53956browse

This article mainly introduces you to the details about the services of angularjs, as well as the usage of angularjs built-in services. It contains usage examples of angularjs. Let’s take a look at this article together.

The essence of the service is a singleton object that provides data and objects.

Two major categories:

①Built-in service

##scope

window

##timeout etc.

Using built-in services Methods provided:

The first step is to inject the services you need into function(

location)

The second step is to call the method data provided in the service. .

Case:

Make a carousel through the built-in $interval

<!DOCTYPE html><html ng-app="myApp"><head lang="en">
  <meta charset="UTF-8">
  <title></title>
  <script src="js/angular.js"></script></head><body><p ng-controller="myCtrl">
  <img ng-src="img/{{imgList[index]}}" alt=""/>
  <h1>{{count}}</h1></p><script>
  var app = angular.module(&#39;myApp&#39;, [&#39;ng&#39;]);

  app.controller(&#39;myCtrl&#39;, function ($scope,$interval) {
    $scope.count = 0;
    timer = $interval(function () {
      $scope.count++;      if($scope.count > 20)
      {
        $interval.cancel(timer)
      }
    },500)

    $scope.index = 0;
    $scope.imgList = [&#39;1.jpg&#39;,&#39;2.jpg&#39;,&#39;3.jpg&#39;]
    $interval(function () {
      $scope.index++;      if($scope.index > 2)
      {
        $scope.index = 0;
      }
    },1000)

  });</script></body></html>

②Customized service

service The purpose is to encapsulate business logic and improve code reuse rate

Methods to customize services: app.factory ('Service name', function(){//Normal method return {}})
app.service('Service name', function(){//Constructor})
app.constant('Service name', {})//Create a constant service
app.value(' Service name', {})//Create variable service

Create service through app.factory ('Service name', function(){//Normal method return {}})

<!DOCTYPE html><html ng-app="myApp"><head lang="en">
  <meta charset="UTF-8">
  <title></title>
  <script src="js/angular.js"></script></head><body><p ng-controller="myCtrl">
  <button ng-click="handleClick()">clickMe</button></p><script>
  var app = angular.module(&#39;myApp&#39;, [&#39;ng&#39;]);  //创建自定义服务
  app.factory(&#39;$output&#39;, function () {
    return {
      print: function () {
        console.log(&#39;func in $output is called&#39;);
      }
    }
  })
  app.controller(&#39;myCtrl&#39;, function ($scope,$output) {
    $scope.handleClick = function () {
      //调用自定义服务所提供的方法
      $output.print();
    }
  });</script></body></html>

Create a service through app.service('service name', function(){//constructor})

<script>
  var app = angular.module(&#39;myApp&#39;, [&#39;ng&#39;]);  //自定义服务
  app.service(&#39;$student&#39;, function () {
    this.study = function () {
      console.log(&#39;we are learning...&#39;);
    }    this.name = "zhangSan";
  })

  app.controller(&#39;myCtrl&#39;,    function ($scope, $student) {
      $student.study();
    });</script></body></html>

**Through app.constant('service Name', {})//Create constant service

app.value(&#39;服务名称&#39;，{})//创建变量服务**<script>  var app = angular.module(&#39;myApp&#39;, [&#39;ng&#39;]);  //创建常量服务
  app.constant(&#39;$Author&#39;,{name:&#39;KKK&#39;,email:&#39;**@163.com&#39;})  //创建变量服务
  app.value(&#39;$Config&#39;,{version:1})


  app.controller(&#39;myCtrl&#39;, function ($scope,$Author,$Config) {
    console.log($Author.email);
    console.log($Config.version);

  });
</script>

Notes:

Customized services need to use methods in other services

<body><p ng-controller="myCtrl">
  <button ng-click="start()">开始</button>
  <button ng-click="stop()">结束</button></p><script>
  var app = angular.module(&#39;myApp&#39;, [&#39;ng&#39;]);  //通过service方法去创建自定义服务
  app.service(&#39;$HeartBeat&#39;, function ($interval) {
    this.startBeat = function () {
      promise = $interval(function () {
        console.log(&#39;beat...&#39;);
      },1000);
    }    this.stopBeat = function () {
      $interval.cancel(promise);
    }
  })

  app.controller(&#39;myCtrl&#39;, function ($scope,$HeartBeat) {
    $scope.start = function () {
      $HeartBeat.startBeat();
    }

    $scope.stop = function () {
      $HeartBeat.stopBeat();
    }
  });</script>

Okay , this article ends here (if you want to see more, go to the PHP Chinese website

AngularJS User Manual

to learn). If you have any questions, you can leave a message below.

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①Built-in service

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