javascript - jQuery Module pattern not named | How is '$' accessible?

Question

Here is the jQuery latest.

It is wrapped in a anonymous immediately invoked function expression ( aiife )

(function( window, undefined ) {
    // all jQuery code
})( window );

How do you access the $ sign , the alias of for jQuery that is so popular?

I thought you needed a name to access if you were going to access something?

Answer 1

答案在以下几行中：

// Expose jQuery to the global object
window.jQuery = window.$ = jQuery;

换句话说，两者都jQuery被$定义为全局对象的属性。这使它们可以按原样访问 - byjQuery和$. )

Answer 2

window对象足以使变量可访问。它基本上是全局对象，执行页面的范围。因此，您可以执行以下操作：

window.test = 'hello!';
alert(test);

Answer 3

不，$是 Javascript 变量的有效名称，jQueryX.js 定义了它。所以你可以使用，例如，

$(document).ready(){}

或者

$('div').hide();

ETC