javascript 在javascript中使用“that”关键字
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use of "that" keyword in javascript
提问by Ayusman
I have few javascript that has used the keyword "that" extensively. I see a lot of posts talking about the javascript keyword "this".
我几乎没有广泛使用关键字“that”的 javascript。我看到很多帖子都在谈论 javascript 关键字“this”。
I wanted to understand the meaning of this key word in javascript context and it's visibility/scope.
我想了解这个关键字在 javascript 上下文中的含义以及它的可见性/范围。
Something like
就像是
that.someFunctionaName(someParameter)
What does it mean?
这是什么意思？
I understand the keyword "this" always points to the owner of the current object.
我理解关键字“this”总是指向当前对象的所有者。
回答by BenM
thatis not a keyword in JavaScript. I suspect the code that you have is using something in the class to define an instance of itself. For example:
that不是 JavaScript 中的关键字。我怀疑您拥有的代码正在使用类中的某些内容来定义其自身的实例。例如：
function myClass()
{
var that = this;
}
By doing this, you can ensure you're referencing the object, and not another element. For example, consider the following sample:
通过这样做，您可以确保您引用的是对象，而不是另一个元素。例如，请考虑以下示例：
function myClass()
{
var that = this;
$('.myele').click(function() {
// 'this' refers to the element that was clicked.
// 'that' still refers to the myClass() object.
});
}
