调用Javascript函数时，如何设置自定义值“this”？ [英] When calling a Javascript function, how do I set a custom value of "this"?

问题描述

我正在使用jQuery并且我有一个用作事件回调的函数，因此在该函数中this表示捕获事件的对象。但是，有一个实例，我想从另一个函数显式调用该函数 - 在这种情况下如何设置函数中的this将相等？

I'm using jQuery and I have a function that serves as an event callback, and so in that function "this" represents the object that that captured the event. However, there's an instance where I want to call the function explicitly from another function - how do I set what "this" will equal within the function in this case?

For示例：

function handleEvent(event) {
    $(this).removeClass("sad").addClass("happy");
}

$("a.sad").click(handleEvent); // in this case, "this" is the anchor clicked

function differentEvent(event) {
    $("input.sad").keydown(e) {
        doSomeOtherProcessing();
        handleEvent(e); // in this case, "this" will be the window object
                        // but I'd like to set it to be, say, the input in question
    }
}

推荐答案

使用 apply call 。

handleEvent.call(this, e);

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