copy这在angularjs中是一个拷贝对象的方法：
<!DOCTYPE html>
<html lang="en" ng-app="myapp">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="js/angular.min.js"></script>
</head>
<body>
</body>
<script>
//copy 拷贝对象
var a = {
name:"my name is lisi"
} var b = {
age:30
} var c = angular.copy(a);
console.log(c);
//如果这样写，下面的b已经被a完全覆盖掉了
var d = angular.copy(a,b);
console.log(b);
console.log(d); </script>
</html>
效果如下所示：