在Javascript中，此语法是什么意思? [英] In Javascript, what does this syntax mean?

问题描述

当我看着jQuery插件时发现了这个片段，想知道它的实际作用

I found this snippet when i was looking at jQuery plugins and wonder what it actually does

一个jQuery插件框架:

A jQuery plugin skeleton:

(function($) {
    ... 
})(jQuery); 

最近在

推荐答案

这将创建一个匿名函数并直接调用它: 等同于

This creates a anonymous function and calls it directly: this is equivalent to

var fun = function(){};
fun();

它在jquery插件中用于确保与定义全局变量'$'的其他库的兼容性.在您的插件框架中，您将插件包装在一个匿名函数中，该函数接收一个名为"$"的参数(因此将覆盖全局变量"$")，然后将该匿名函数以"jQuery"作为参数进行调用，因此有效地$ = jQuery，但仅限于该匿名函数内.

its used in jquery plugins to ensure compatibility with other libraries defining a global variable '$'. in your plugin sekeleton, you wrap your plugin in a anonymous function, which receives an argument named '$' (thus overriding a global variable '$'), this anonymous function is then called with 'jQuery' as parameter, so effectively $ becomes = jQuery, but only within that anonymous function.

这篇关于在Javascript中，此语法是什么意思?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！