javascript 调用函数时如何设置jQuery this？
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How to set jQuery this when calling a function?
提问by slolife
Using jQuery, I set a link tag's click handler like this:
使用 jQuery，我设置了一个链接标签的点击处理程序，如下所示：
$('#lnk').click(handleClick);
handleClick does something like this:
handleClick 做这样的事情：
function handleClick() {
var $this = $(this);
...
}
Now I have a need to directly call handleClick() outside of #lnk being clicked. Is there a way for me to set thiswhen calling handleClick?
现在我需要在点击 #lnk 之外直接调用 handleClick() 。有没有办法this在调用 handleClick 时进行设置？
回答by Felix Kling
handleClick.call(theElementThatShouldBeThis);
But of course theElementThatShouldBeThismust be a DOM element or something that is accepted as input for jQuery().
但当然theElementThatShouldBeThis必须是 DOM 元素或被接受为jQuery().
And it becomes more tricky if you are accessing the eventelement inside handleClick. But I will just assume you don't ;)
如果你访问event里面的元素，它会变得更加棘手handleClick。但我会假设你没有;)
You can also always execute the event handler in the context of #lnkby calling $('#lnk').click()(which simulates a click).
您还可以始终在#lnk通过调用$('#lnk').click()（模拟单击）的上下文中执行事件处理程序。
回答by Karim
I think you're looking for "call" or "apply":
我认为您正在寻找“致电”或“申请”：
Call
称呼
https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/call
https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/call
Apply
申请
https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/apply
https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/apply
From MDC
来自 MDC
var result = fun.apply(thisArg, [argsArray]);
or
var result = fun.call(thisArg[, arg1[, arg2[, ...]]]);
回答by Roy Tinker
Use Function.apply and pass in the DOM element returned by the query.
使用 Function.apply 并传入查询返回的 DOM 元素。
handleClick.apply($('#lnk')[0]);
Or better yet, let jQuery simulate a click on the element (Assuming you've already attached the click event handler).
或者更好的是，让 jQuery 模拟对元素的点击（假设您已经附加了点击事件处理程序）。
$('#lnk').click();
