blocks|key|371230|text|它是对当前事件对象的引用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|371231|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

It's a reference to the current event object

blocks|key|586942|text|在该示例中，e只是该函数的一个参数，但通过它传入的是event对象。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|586943|entityMap^0|6|1|Q|5|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

In that example, <code>e</code> is just a parameter for that function, but it's the <code>event</code> object that gets passed in through it.

blocks|key|586999|text|e没有任何特殊的含义。当参数为event时，使用e作为函数参数名只是一种惯例。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|587000|它可以是|587001|$(this).click(function(loremipsumdolorsitamet)+{
++++//+does+something
}|code-block|syntax|javascript|587002|也是。|587003|entityMap^0|0|1|F|5|O|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|Z|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|P|$]]

<code>e</code> doesn't have any special meaning. It's just a convention to use <code>e</code> as function parameter name when the parameter is <code>event</code>.

It can be 

<pre><code>$(this).click(function(loremipsumdolorsitamet) {
 // does something
}
</code></pre>

as well.

blocks|key|371404|text|e参数是事件对象的缩写。例如，您可能希望为取消默认操作的锚点创建代码。要做到这一点，您需要编写如下代码：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|371405|$('a').click(function(e)+{
++++e.preventDefault();
}|code-block|syntax|javascript|371406|这意味着当单击<a>标记时，将阻止单击事件的默认操作。|371407|虽然您可能经常看到它，但它不是您必须在函数中使用的东西，即使您已将其指定为参数。|371408|entityMap^0|0|1|0|0|7|3|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|X|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

The <code>e</code> argument is short for the event object. For example, you might want to create code for anchors that cancels the default action. To do this you would write something like:

<pre><code>$('a').click(function(e) {
 e.preventDefault();
}
</code></pre>

This means when an <code>&lt;a&gt;</code> tag is clicked, prevent the default action of the click event.

While you may see it often, it's not something you have to use within the function even though you have specified it as an argument.

blocks|key|587133|text|在jQuery+e中是event的缩写，即当前事件对象。它通常作为要触发的事件函数的参数传递。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|587134|演示：jQuery+Events|587135|在演示中，我使用了e|587136|$("img").on("click+dblclick+mouseover+mouseout",function(e){
++++++++$("h1").html("Event:+"+%2B+e.type);
});+|code-block|syntax|javascript|587137|我可能已经使用了event|587138|+$("img").on("click+dblclick+mouseover+mouseout",function(event){
++++++++++++$("h1").html("Event:+"+%2B+event.type);
++++});+|587139|同样的事情！|587140|程序员懒惰我们使用了大量的速记，一部分是它减少了我们的工作，一部分是有助于可读性。理解这一点将有助于你理解编写代码的心态。|587141|entityMap|0|LINK|mutability|MUTABLE|url|http://codepen.io/Gothburz/pen/jbxxao/^0|8|1|B|5|0|3|D|0|0|9|1|0|0|8|5|0|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@$9|15|A|16|B|C]|$9|17|A|18|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|19|8|@]|D|@$9|1A|A|1B|1|1C]]|E|$]]|$1|H|3|I|5|6|7|1D|8|@$9|1E|A|1F|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|1G|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|1H|8|@$9|1I|A|1J|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|L|7|1K|8|@]|D|@]|E|$M|N]]|$1|S|3|T|5|6|7|1L|8|@]|D|@]|E|$]]|$1|U|3|V|5|6|7|1M|8|@]|D|@]|E|$]]|$1|W|3|-4|5|6|7|1N|8|@]|D|@]|E|$]]]|X|$Y|$5|Z|10|11|E|$12|13]]]]

In jQuery <code>e</code> short for <code>event</code>, the current event object. It's usually passed as a parameter for the event function to be fired.

Demo: <a href="http://codepen.io/Gothburz/pen/jbxxao/" rel="nofollow">jQuery Events</a> 

In the demo I used <code>e</code>

<pre><code>$("img").on("click dblclick mouseover mouseout",function(e){
 $("h1").html("Event: " + e.type);
}); 
</code></pre>

I may as well have used <code>event</code>

<pre><code> $("img").on("click dblclick mouseover mouseout",function(event){
 $("h1").html("Event: " + event.type);
 }); 
</code></pre>

Same thing! 

Programmers are lazy we use a lot of shorthand, partly it decreases our work, partly is helps with readability. Understanding that will help you understand the mentality of writing code.

blocks|key|587164|text|$(this).click(function(e)+{
++++//+does+something
});|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|587165|参考上面的代码|unstyled|587166|$(this)是以某个变量形式存在的元素。|offset|length|style|CODE|587167|click是需要执行的事件。|587168|参数e会自动从js传递给您的函数，该函数保存$(this)的值，可以在代码中进一步使用它来执行一些操作。|587169|entityMap^0|0|0|0|7|0|0|5|0|2|1|M|7|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|T|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|U|8|@$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|F|7|X|8|@$I|Y|J|Z|K|L]]|9|@]|A|$]]|$1|O|3|P|5|F|7|10|8|@$I|11|J|12|K|L]|$I|13|J|14|K|L]]|9|@]|A|$]]|$1|Q|3|-4|5|F|7|15|8|@]|9|@]|A|$]]]|R|$]]

<pre><code>$(this).click(function(e) {
 // does something
});
</code></pre>

In reference to the above code 
<code>$(this)</code> is the element which as some variable. 
<code>click</code> is the event that needs to be performed. 
the parameter <code>e</code> is automatically passed from js to your function which holds the value of <code>$(this)</code> value and can be used further in your code to do some operation.

I am new to JavaScript/jQuery and I've been learning how to make functions. A lot of functions have cropped up with (e) in brackets. Let me show you what I mean:

<pre><code>$(this).click(function(e) {
 // does something
});
</code></pre>

It always appears that the function doesn't even use the value of (e), so why is it there so often?

In Javascript/jQuery what does (e) mean?

我是JavaScript/jQuery的新手，我一直在学习如何编写函数。很多函数都是用括号中的(e)表示的。让我告诉你我的意思：$(this).click(function(e) {    // does something});看起来函数似乎甚至不使用(e)的值，那么为什么它经常出现呢？

问在Javascript/jQuery中(e)是什么意思？
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