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
例子：
<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>
