Question

假设我有一个对象A：

#a good old global
logview = "/usr/bin/logview"


#a function that starts logview:
port = 100
log_file = "/foo/bar"
logview_process = subprocess.Popen([logview, log_file, port],
                                 stdout = subprocess.DEVNULL,
                                 stderr = subprocess.STDOUT)

#a separate function that monitors in the background:
while True:
  time.sleep(1)

  logview_status = 0

  try:
    logview_status = psutil.Process(logview_process.pid).status()
  except psutil.NoSuchProcess:
    pass

  if(logview_status == psutil.STATUS_STOPPED or
     logview_status == psutil.STATUS_ZOMBIE or
     logview_status == psutil.STATUS_DEAD or
     logview_status == 0):
    print("Logview died; restarting")

    logview_cli_list = [logview]
    logview_cli_list.extend(logview_process.args)

    logview_process = subprocess.Popen(logview_cli_list,
                                       stdout = subprocess.DEVNULL,
                                       stderr = subprocess.STDOUT)

  if(some_other_condition): break

然后，假设我也是一个对象B：

var A = {
    'parameter': "Dura lex sed lex.",
    'function_a': function (new_type) {
        console.log ("It's working!");
    }
};

我需要的是一种在对象B中动态创建方法var B = { 'parameter': "Veni vidi vici!" };而无需复制/克隆对象A中的对象A（“Dura lex sed lex。”）的参数的简单方法。保留对象B的参数（“Vini vidi vici！”）。

我该怎么做？

Answer 1

试一试：

B['function_b'] = A['function_a'];

Answer 2

你的意思是这样的吗？

var A = {
    'parameter': "Dura lex sed lex.",
    'function_a': function (new_type) {
        console.log ("It's working!");
    }
};

var B = {
    'parameter': "Vini vidi vici!"
};

var clone = function(origin, target, prefix) {
  Object.keys(origin).forEach(function(key) {
    if (!target.hasOwnProperty(key)) {
      if (key.indexOf("function_") > -1) {
        target["function_" + prefix] = origin[key];
      }
    }
  });
}

clone(A, B, "b");

console.log(B);
B.function_b();

Answer 3

我不知道我是否理解你的问题，但我认为你想要这样的事情：

B.function_b = function(whatever) {
  console.log('it works!');
};

克隆或复制对象中的方法（Javascript）

3 个答案: