命名匿名函数

第二个示例是使用 命名函数表达式 它在大多数浏览器中都可以正常工作,但在IE中有一些问题,在使用之前应该注意到。我推荐阅读 kangax's excellent article on this subject .

您可以对arrow函数执行类似的操作,它在node上为我工作。

const createTask = ([name, type = 'default']) => {
  const fn = () => { ... }

  Object.defineProperty(fn, 'name', {
    value: name,
    configurable: true,
  })

  return fn
}

MDN is somewhat misleading here:

不能更改函数名,此属性是只读的…

要改变它, 你可以使用 对象.定义属性() 虽然 .

This answer provides more details.

我通常这样做: $(“对象”).bind(“单击” ,函数名()。{ 警报(“X”); (});

不要碰到任何问题。

一些主要图书馆鼓励这样做:

https://groups.google.com/forum/m/#!topic/firebug/MgnlqZ1bzX8

http://blog.getfirebug.com/2011/04/28/naming-anonymous-javascript-functions/

如果 动态 函数名是问题所在。您可以尝试以下操作:

function renameFunction(name, fn) {
    return (new Function("return function (call) { return function " + name +
       " () { return call(this, arguments) }; };")())(Function.apply.bind(fn));
} 

renameFunction('dynamicName',function() { debugger })();

资料来源:Nate Ferrero at How to dynamically set a function/object name in Javascript as it is displayed in Chrome

有了ECMAScript2015(ES2015,ES6)语言规范,就可以不使用慢速和不安全的语言。 eval 功能和无功能 Object.defineProperty 这种方法既破坏了函数对象,又不适用于某些关键方面。

例如,请参见 nameAndSelfBind 能够同时命名匿名函数和重命名命名函数的函数,以及将其自身的实体绑定为 这 以及存储对要在外部作用域中使用的已处理函数的引用( JSFiddle ):

(function()
{
  // an optional constant to store references to all named and bound functions:
  const arrayOfFormerlyAnonymousFunctions = [],
        removeEventListenerAfterDelay = 3000; // an auxiliary variable for setTimeout

  // this function both names argument function and makes it self-aware,
  // binding it to itself; useful e.g. for event listeners which then will be able
  // self-remove from within an anonymous functions they use as callbacks:
  function nameAndSelfBind(functionToNameAndSelfBind,
                           name = 'namedAndBoundFunction', // optional
                           outerScopeReference)            // optional
  {
    const functionAsObject = {
                                [name]()
                                {
                                  return binder(...arguments);
                                }
                             },
          namedAndBoundFunction = functionAsObject[name];

    // if no arbitrary-naming functionality is required, then the constants above are
    // not needed, and the following function should be just "var namedAndBoundFunction = ":
    var binder = function() 
    { 
      return functionToNameAndSelfBind.bind(namedAndBoundFunction, ...arguments)();
    }

    // this optional functionality allows to assign the function to a outer scope variable
    // if can not be done otherwise; useful for example for the ability to remove event
    // listeners from the outer scope:
    if (typeof outerScopeReference !== 'undefined')
    {
      if (outerScopeReference instanceof Array)
      {
        outerScopeReference.push(namedAndBoundFunction);
      }
      else
      {
        outerScopeReference = namedAndBoundFunction;
      }
    }
    return namedAndBoundFunction;
  }

  // removeEventListener callback can not remove the listener if the callback is an anonymous
  // function, but thanks to the nameAndSelfBind function it is now possible; this listener
  // removes itself right after the first time being triggered:
  document.addEventListener("visibilitychange", nameAndSelfBind(function(e)
  {
    e.target.removeEventListener('visibilitychange', this, false);
    console.log('\nEvent listener 1 triggered:', e, '\nthis: ', this,
                '\n\nremoveEventListener 1 was called; if "this" value was correct, "'
                + e.type + '"" event will not listened to any more');
  }, undefined, arrayOfFormerlyAnonymousFunctions), false);

  // to prove that deanonymized functions -- even when they have the same 'namedAndBoundFunction'
  // name -- belong to different scopes and hence removing one does not mean removing another,
  // a different event listener is added:
  document.addEventListener("visibilitychange", nameAndSelfBind(function(e)
  {
    console.log('\nEvent listener 2 triggered:', e, '\nthis: ', this);
  }, undefined, arrayOfFormerlyAnonymousFunctions), false);

  // to check that arrayOfFormerlyAnonymousFunctions constant does keep a valid reference to
  // formerly anonymous callback function of one of the event listeners, an attempt to remove
  // it is made:
  setTimeout(function(delay)
  {
    document.removeEventListener('visibilitychange',
             arrayOfFormerlyAnonymousFunctions[arrayOfFormerlyAnonymousFunctions.length - 1],
             false);
    console.log('\nAfter ' + delay + 'ms, an event listener 2 was removed;  if reference in '
                + 'arrayOfFormerlyAnonymousFunctions value was correct, the event will not '
                + 'be listened to any more', arrayOfFormerlyAnonymousFunctions);
  }, removeEventListenerAfterDelay, removeEventListenerAfterDelay);
})();

匿名函数是一个没有名称的函数,它是从定义它的地方执行的。或者,您可以在使用调试函数之前定义它。

function debuggingName() { 
    alert("x"); 
}

$("object").bind("click", debuggingName);