事件处理程序绑定到匿名函数vs命名函数 [英] Event handler bind to an anonymous function vs named function
问题描述
我知道 .on()
存在于jQuery 和 .bind()
不应该在将来使用,考虑到我有一个版本的jQuery大于或等于1.7。
我想知道的是:有没有使用 .bind()
?
将匿名函数或命名函数附加到事件处理程序之间的差异示例:
//匿名函数
$(。 ).bind(click,function(){
alert(Hello);
});
//命名函数
$(。warning)。bind(click,foo);
function foo(){
alert(Hello);
}
想象一下,我有100个 div
在我的页面中的类警告
。函数 .bind()
将为每个具有匿名函数的处理程序附加一个新函数,但与JavaScript和jQuery内部的命名函数完全相同?
谢谢。
不会有任何一个主要的区别是,使用命名功能,您还可以选择性地解除绑定功能,而不仅仅是与事件类型相关联的所有功能。
当然,这也可以帮助您避免代码重复。
I know .on()
exists with jQuery and .bind()
should not be used in the future, considering that I have a version of jQuery greater than or equal to 1.7.
What I want to know is this: are there are any differences between attaching an anonymous function or named function to an event handler using .bind()
?
Example:
// Anonymous function
$(".warning").bind("click", function(){
alert("Hello");
});
// Named function
$(".warning").bind("click", foo);
function foo(){
alert("Hello");
}
Imagine that I have 100 div
's with the class warning
in my page. The function .bind()
will attach a new function to every handler with an anonymous function but will it be exactly the same with a named function in the very internal of JavaScript and jQuery?
Thank you.
There won't be any noticeable performance difference.
One main difference is that with a named function you can also selectively unbind functions and not just all functions associated with an event type.
Of course, this can also help you avoid code duplication.
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