AngularJS API之copy深拷贝

angular提供了一个可以复制对象的api——copy(source,destination),它会对source对象执行深拷贝。

使用时需要注意下面几点:

  • 如果只有一个参数(没有指定拷贝的对象),则返回一个拷贝对象
  • 如果指定了destination,则会深拷贝对象复制给destination
  • 如果source是null或者undefined,那么会直接返回source
  • 如果source就是desitination,那么会报错。

下面看看使用样例:

<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>
	</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>

posted @ 2015-11-03 20:41  xingoo  阅读(30060)  评论(0编辑  收藏  举报