自我认为这个方法跟angular.copy(src,dst)有点相似。在angular.extend({},src)时，就可以画等号。这个src只代表一个对象。代码如下：（注意这个src可以有多个对象）
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>angular.extend(dst,src)</title> </head> <body> <script src="../materialDesignfile/angular.min.js"></script> <div ng-app="myApp" ng-controller="myCtrl" ng-cloak> <button ng-click="extendUser()">user2</button> <pre>{{user2|json}}</pre> </div> <script> (function () { "use strict"; angular.module("myApp",[]).controller("myCtrl",[‘$scope‘,function ($scope) { var user={name:"ouyangfeng",age:19}; var user3={name2:"sixi",age3:6,height:180} $scope.extendUser=function () { $scope.user2= angular.extend({},user,user3); } }]) })(); </script> </body> </html>
原文：http://www.cnblogs.com/1540340840qls/p/7624891.html