如何检查是否已加载jQuery插件? [英] How can I check if a jQuery plugin is loaded?

问题描述

有什么方法可以检查特定的插件是否可用?

Is there any way to check if a particular plugin is available?

假设您正在开发一个依赖于另一个正在加载的插件的插件.

Imagine that you are developing a plugin that depends on another plugin being loaded.

例如，我希望jQuery Validation插件使用dateJS库来检查给定日期是否有效.如果dateJS可用，在jQuery Valdation插件中检测的最佳方法是什么?

For example I want the jQuery Validation plugin to use the dateJS library to check if a given date is valid. What would be the best way to detect, in the jQuery Valdation plugin if the dateJS was available?

推荐答案

通常来说，jQuery插件是jQuery范围内的名称空间.您可以运行简单的检查以查看名称空间是否存在:

Generally speaking, jQuery plugins are namespaces on the jQuery scope. You could run a simple check to see if the namespace exists:

 if(jQuery().pluginName) {
     //run plugin dependent code
 }

dateJs但是不是jQuery插件.它修改/扩展了javascript日期对象，并且不作为jQuery名称空间添加.您可以检查所需的方法是否存在，例如:

dateJs however is not a jQuery plugin. It modifies/extends the javascript date object, and is not added as a jQuery namespace. You could check if the method you need exists, for example:

 if(Date.today) {
      //Use the dateJS today() method
 }

但是您可能会遇到API与本机Date API重叠的问题.

But you might run into problems where the API overlaps the native Date API.

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