如何从 $scope.$watch(..., true) 获取 Angular 更改键

Question

我正在深入观察 Angular 中的一个对象，

$scope.$watch('bigObject', function(newVal, oldVal, scope) { //Watch the whole object
    console.log("The key that changed was: " + key);
}, true); //Deep watch

如何获取已更改的密钥？

示例输出：The key that changed was: bigObject.users.john.birthday

Answer 1

试试这个：

 $scope.$watch('bigObject', function (newValue, oldValue, scope) {
    //Do anything with $scope.letters
    if(oldValue.users.john.birthday == newValue.users.john.birthday){
      //nothing chages
    }
    else{
       // write your logic here after changinging value    
      }
            console.log(newValue.users.john.birthday);
  });