如何使用方法创建 jQuery 插件?
我正在尝试编写一个 jQuery 插件，该插件将为调用它的对象提供额外的功能/方法.我在网上阅读的所有教程(过去2小时一直在浏览)最多包括如何添加选项，而不是附加功能.
I'm trying to write a jQuery plugin that will provide additional functions/methods to the object that calls it. All the tutorials I read online (have been browsing for the past 2 hours) include, at the most, how to add options, but not additional functions.
这是我想做的事情:
//通过调用该div的插件将div格式化为消息容器
//format div to be a message container by calling the plugin for that div
$("#mydiv").messagePlugin();
$("#mydiv").messagePlugin().saySomething("hello");
或类似的东西.归结为:我调用插件，然后调用与该插件关联的函数.我似乎无法找到一种方法来做到这一点，而且我之前已经看到很多插件都这样做了.
or something along those lines. Here's what it boils down to: I call the plugin, then I call a function associated with that plugin. I can't seem to find a way to do this, and I've seen many plugins do it before.
这是我目前所拥有的插件:
Here's what I have so far for the plugin:
jQuery.fn.messagePlugin = function() {
return this.each(function(){
alert(this);
});
//i tried to do this, but it does not seem to work
jQuery.fn.messagePlugin.saySomething = function(message){
$(this).html(message);
}
};
我怎样才能实现这样的目标?
How can I achieve something like that?
谢谢！
2013 年 11 月 18 日更新:我已将正确答案更改为 Hari 以下评论和点赞的答案.
Update Nov 18, 2013: I've changed the correct answer to that of Hari's following comments and upvotes.
推荐答案
根据 jQuery Plugin Authoring 页面 (http://docs.jquery.com/Plugins/Authoring)，最好不要混淆 jQuery 和 jQuery.fn 命名空间.他们建议采用这种方法:
According to the jQuery Plugin Authoring page (http://docs.jquery.com/Plugins/Authoring), it's best not to muddy up the jQuery and jQuery.fn namespaces. They suggest this method:
(function( $ ){
var methods = {
init : function(options) {
},
show : function( ) { },// IS
hide : function( ) { },// GOOD
update : function( content ) { }// !!!
};
$.fn.tooltip = function(methodOrOptions) {
if ( methods[methodOrOptions] ) {
return methods[ methodOrOptions ].apply( this, Array.prototype.slice.call( arguments, 1 ));
} else if ( typeof methodOrOptions === 'object' || ! methodOrOptions ) {
// Default to "init"
return methods.init.apply( this, arguments );
} else {
$.error( 'Method ' + methodOrOptions + ' does not exist on jQuery.tooltip' );
}
};
})( jQuery );
基本上，您将函数存储在数组中(范围为包装函数)，如果传递的参数是字符串，则检查条目，如果参数是对象(或空).
Basically you store your functions in an array (scoped to the wrapping function) and check for an entry if the parameter passed is a string, reverting to a default method ("init" here) if the parameter is an object (or null).
然后你可以像这样调用方法......
Then you can call the methods like so...
$('div').tooltip(); // calls the init method
$('div').tooltip({ // calls the init method
foo : 'bar'
});
$('div').tooltip('hide'); // calls the hide method
$('div').tooltip('update', 'This is the new tooltip content!'); // calls the update method
Javascript 的参数"变量是一个包含所有传递参数的数组，因此它适用于任意长度的函数参数.
Javascripts "arguments" variable is an array of all the arguments passed so it works with arbitrary lengths of function parameters.
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