Feb 14, 2013 · that is 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: var that = this; By doing this, you can ensure you're referencing the object, and not another element. For example, consider the following sample: var that = this; $('.myele').click(function() { .

Feb 3, 2011 · In a JavaScript file I saw: function Somefunction(){ var that = this; ... } What is the purpose of declaring that and assigning this this to it?

Jul 8, 2014 · this in JavaScript always refers to current object, method of which was called. But sometimes you need to access this of your object in deeper. For example, in callbacks. Like so: function MyClass() { this.a = 10; this.do = function() { http.get('blablabla', function(data) { this.a = data.new_a; }); }; }

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Jun 3, 2019 · It is a special identifier keyword that automatically defined in the scope of every function. “this” is a run-time binding (not author-time). It is contextual based on the conditions of the...

In JavaScript, the this keyword refers to an object. The this keyword refers to different objects depending on how it is used: In an object method, this refers to the object. Alone, this refers to the global object. In a function, this refers to the global object. In …

Aug 5, 2017 · 在JavaScript中，this代表的是当前对象。 var that=this就是将当前的this对象复制一份到that变量中。 这样做有什么意义呢？ bindEvent: function (){ var that = this; $ ("btn_buy"). onclick = function (){ that. buy (); . $ ("btn_addcart"). onclick = function (){ that. addShopCart (); 可以看到，this对象在程序中随时会改变，而var that=this之后，that没改变之前仍然是指向当时的this，这样就不会出现找不到原来的对象。 文章浏览阅读1.6w次，点赞7次，收藏13次。

Jul 18, 2021 · JS 中以 function 关键字声明的函数，其 this 所指向的对象在调用时才能确定，而内层函数又不会自动继承外层函数的 this 。 有时候我们需要在内层函数中使用外层函数的 this，这时候可以在外层定义 var that = this，然后在内层访问这个 that 就行了，这里相当于给外层的 this 起了个别名，而不是“改变 this 的指向”。 但是现在既然有了箭头函数，就没必要用这么麻烦的方法了。 Vue 的各个方法中访问的 this 指的是 Vue 实例，这个 this 是 Vue 初始化的时候帮你绑定 …

4 days ago · When a regular function is invoked as a method of an object (obj.method()), this points to that object. When invoked as a standalone function (not attached to an object: func()), this typically refers to the global object (in non-strict mode) or undefined (in strict mode).

Nov 23, 2024 · Explore the purpose of using 'that' for maintaining context in JavaScript. Learn through examples and best practices.