当在console.log中调用时，jQuery实例如何显示为数组？ [英] How does a jQuery instance appear as an array when called in console.log?

问题描述

当输入到JavaScript控制台时，jQuery对象显示为数组。但是，它仍然是jQuery对象的实例。

When entered into a JavaScript console, a jQuery object appears as an array. However, it's still an instance of the jQuery object.

var j = jQuery();
=> []
console.log(j);
=> []
console.log('test with string concat: ' + j);
=> test with string concat: [object Object]
j instanceof Array
=> false
j instanceof jQuery
=> true

如何用自己的对象复制这个？

How could one duplicate this with their own object?

--------- EDIT ---------

--------- EDIT ---------

感谢ZER0的支持。下面是一些示例代码来创建一个在控制台中像jQuery一样工作的对象：

Thanks to ZER0 for figuring it out. Here's some example code to create an object that works just like jQuery in the console:

var Foo = function() {
  this.splice = Array.prototype.splice;
  Array.prototype.push.apply(this, arguments);

  return this;
}

var f = new Foo();
=> []
console.log(f);
=> []
console.log('test with string concat: ' + f);
=> test with string concat: [object Object]
f instanceof Array
=> false
f instanceof Foo
=> true

很酷。

推荐答案

我相信他们有这样的东西：

I believe they have something like that:

// Adding items to an object like an Array:
var myObject = {splice : Array.prototype.splice};

Array.prototype.push.call(myObject, 1, 10, "foo");

// Getting items from an object like an Array:

alert(Array.prototype.slice.call(myObject, 0));

console.log(myObject);

alert(myObject);

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