`$（document）.on（" click"，" a"`和`$（" a"））之间的区别。click（`

问题描述：

任何人都可以告诉我这两个脚本之间有什么区别，我不是javascript / jquery专家。

Can Anybody tell me what will be the difference between these two script,Am not a javascript/jquery expert.

$(document).on("click", "a", function () {
    i = $(this).data("value");
    alert(i)
})

$("a").click(function () {
    i = $(this).data("value");
    alert(i)
});

答

$（文件）。 on（click，a，function（）{将绑定事件在 a 元素上，这些元素在绑定事件。这称为 事件委托 。

$(document).on("click", "a", function () { will bind the event on the a elements which are not present at the time of binding event. This is called as event delegation.

事件委托允许我们将单个事件监听器附加到父元素，该元素将为匹配选择器的所有后代触发，无论这些后代是否为现在存在或将来添加。

Event delegation allows us to attach a single event listener, to a parent element, that will fire for all descendants matching a selector, whether those descendants exist now or are added in the future.

而 $（a）。click（function（function））{只会将事件绑定到DOM中存在的 a 元素。

Whereas $("a").click(function () { will bind events only to the a elements which are present in DOM.

`$（document）.on（" click"，" a"`和`$（" a"））之间的区别。click（`

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