Пример циклической ссылки в JavaScript?

Question

Пример циклической ссылки в JavaScript?

Если Вы хотели бы к , сохраняют разрывы строки, Вы могли бы попробовать:

function parse($text) {
    // Damn pesky carriage returns...
    $text = str_replace("\r\n", "\n", $text);
    $text = str_replace("\r", "\n", $text);

    // JSON requires new line characters be escaped
    $text = str_replace("\n", "\\n", $text);
    return $text;
}

46

javascript closures

задан MatthewJ 29 September 2009 в 15:55

2 ответа

window.onload = function() {
  hookup(document.getElementById('menu'));

  function hookup(elem) {
    elem.attachEvent( "onmouseover", mouse);

    function mouse() {
    }
  }
}

As you can see, the handler is nested within the attacher, which means it is closed over the scope of the caller.

11

ответ дан 26 November 2019 в 20:20

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score 54 · Accepted Answer

A simple way to create a circular reference is to have an object that refers to itself in a property:

function Foo() {
  this.abc = "Hello";
  this.circular = this;
}

var foo = new Foo();
alert(foo.circular.circular.circular.circular.circular.abc);

Here the foo object contains a reference to itself.

With closures this is usually more implicit, by just having the circular reference in scope, not as an explicit property of some object:

var circular;

circular = function(arg) {
  if (arg) {
    alert(arg);
  }
  else {
    // refers to the |circular| variable, and by that to itself.
    circular("No argument");
  }
}

circular("hello");
circular();

Here the function saved in circular refers to the circular variable, and thereby to itself. It implicitly holds a reference to itself, creating a circular reference. Even if circular now goes out of scope, it is still referenced from the functions scope. Simple garbage collectors won't recognize this loop and won't collect the function.