获取元素，在 javascript 中引起更改事件
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get element, caused change event in javascript
提问by DotNetter
i want to get know within onchangeevent handler, which control caused change (or blur) event.
i tried to use jQuery $(":focus")for that aim, but
我想在onchange事件处理程序中了解哪个控件导致了更改（或模糊）事件。我试图为此$(":focus")目的使用 jQuery ，但是
$('.some_class').change(function (e) {
console.log(e.target);
console.log($(':focus').get(0)); // always `undefined`.
/* ......... other code......... */
});
回答by Madao
$('.some_class').change(function (e) {
console.log(e.target);
console.log($(':focus').); // just remove the .get(0)
}); remove the .get(0),you can get the element which is on focus
}); 删除.get(0)，你可以得到焦点上的元素
回答by Dennis
In jQuery, thisrefers to the element with the event handler and event.target, if eventis the parameter to your event handler callback will be the source of the event, if, for example, you clicked on a child element and the click bubbled up.
在 jQuery 中，this指的是具有事件处理程序的元素 event.target，如果event是事件处理程序回调的参数，则将是事件的来源，例如，如果您单击子元素并且单击冒泡。
The focus event gets fired after the blur event, so there will be a short period of time during which no element has focus. If you really need this, you could set a short timeout to see if another inputhas focus a couple milliseconds after the original one gets blurred.
focus 事件在 blur 事件之后被触发，所以会有很短的时间没有元素获得焦点。如果你真的需要这个，你可以设置一个短暂的超时，看看另一个input是否在原始焦点模糊几毫秒后有焦点。
