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Angular provides an API for copying objects - copy(source, destination), which will perform a deep copy of the source object.

The following points should be noted when using it:

If only one parameter is provided (no specified copy object), a copy object will be returned
If destination is specified, the object will be deeply copied to destination
If source is null or undefined, source will be returned directly
If source is the same as destination, an error will be reported.

Let's see some examples below:

<html>
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <script src="http://apps.bdimg.com/libs/angular.js/1.2.16/angular.min.js"></script>
</head>
<body ng-app="copyExample">
  <div ng-controller="ExampleController">
    <form novalidate class="simple-form">
      Name: <input type="text" ng-model="user.name" /><br />
      E-mail: <input type="email" ng-model="user.email" /><br />
      Gender: 
      <input type="radio" ng-model="user.gender" value="male" />
      male
      <input type="radio" ng-model="user.gender" value="female" />
      female
      <br />
      <button ng-click="reset()">RESET</button>
      <button ng-click="update(user)">SAVE</button>
    </form>
    <pre>form = {{user | json}}</pre>
    <pre>master = {{master | json}}<</pre>/pre>
  </div>
  <script>
  angular.module('copyExample', [])
  .controller('ExampleController', ['$scope', function($scope) {
    $scope.master = {};
    var test1;
    console.log(angular.copy(test1));//undefined
    var test3=null;
    console.log(angular.copy(test2));//undefined
    var test2 = "a";
    // console.log(angular.copy(test2,test2));//error!!
    $scope.update = function(user) {
      // Example with 1 argument
      $scope.master = angular.copy(user);
    });
    $scope.reset = function() {
      // Example with 2 arguments
      angular.copy($scope.master, $scope.user);
      console.log($scope.master);
      console.log($scope.user);
    });
    $scope.reset();
  });
  </script>
</body>
</html>

This is the summary of the AngularJS API's copy deep copy, and we will continue to supplement relevant information. Thank you all for your support of this site!

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