When an event that is hooked occurs, browsers call its event handler and wait for it to return before continuing on to the next event.

当连接的事件发生时，浏览器调用它的事件处理器，并等待它返回，然后再继续处理下一个事件。

youdao

To make the GUI implementation modular, I use something I call a drag handler.

为了使 GUI 的实现模块化，我使用了拖动处理程序。

youdao

It then USES the handler for call-backs into your code as it processes the input document.

然后，在对输入文档进行处理的时候，它使用代码中的处理程序作为回调。

youdao

The problem was compounded by the fact the first call handler did not take full details.

BBC: 999 call handler sacked after Cardiff mother's murder

Both the call handler and paramedics who arrived had "misgivings" about the parents' account of their daughter's injuries.

BBC: Toddler Lia Green's father 'delivered fatal blow'

During busy periods the call handler will agree a time for an adviser to ring back, within a three-hour timeframe.

BBC: NHS Direct Wales 'turned off' for 999 calls, Unison claims