jsCopy to Clipboard // 在网页浏览器中,window 对象也是全局对象: console.log(this === window); // true this.b = "MDN"; console.log(window.b); // "MDN" console.log(b); // "MDN" 如果源代码作为模块加载(对于 HTML,这意味着在 标签中添加 type="module"),在顶层,this 总是undefined...
「The this keyword evaluates to the value of the ThisBinding of the current execution context.」 「this 这个关键字代表的值为当前执行上下文的ThisBinding。」 然后再来看看MDN 对this 的定义: 「In most cases, the value of this is determined by how a function is called.」 「在大多数的情况下,t...
「The this keyword evaluates to the value of the ThisBinding of the current execution context.」 「this 这个关键字代表的值为当前执行上下文的ThisBinding。」 然后再来看看MDN 对this 的定义: 「In most cases, the value of this is determined by how a function is called.」 「在大多数的情况下,t...
「The this keyword evaluates to the value of the ThisBinding of the current execution context.」「this 这个关键字代表的值为当前执行上下文的ThisBinding。」然后再来看看MDN 对this 的定义：「In most cases, the value of this is determined by how a function is called.」「在大多数的情况下，this ...
https://toddmotto.com/understanding-the-this-keyword-in-javascript/ https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/new https://github.com/JoeHetfield/You-Dont-Know-JS/blob/b430e8d5a0ef612eb9c3b90c54891c5be6923685/this%20%26%20object%20prototypes/ch2.md ...
我很喜欢Ryan Morr在Understanding Scope and Context in JavaScript中的一句话: Context is always the value of the this keyword which is a reference to the object that “owns” the currently executing code. 但是,“this”的环境不一定和它的执行环境相同。
细读JS 之 this 详解(本文) 在事件处理函数中的 this 一、this 是什么? 在MDN上原话是: Thethiskeyword refers to the current object the code is being written inside. 翻译过来就是:在 JavaScript 中,关键字this指向了当前代码运行时的对象。
细读JS 之 this 详解(本文) 在事件处理函数中的 this 一、this 是什么? 在MDN上原话是: Thethiskeyword refers to the current object the code is being written inside. 翻译过来就是:在 JavaScript 中,关键字this指向了当前代码运行时的对象。
The JavaScriptthiskeyword refers to the object it belongs to. It has different values depending on where it is used: In a method,thisrefers to theowner object. Alone,thisrefers to theglobal object. In a function,thisrefers to theglobal object. ...
The this keyword is a very important concept in JavaScript, and also a particularly confusing one to both new developers and those who have experience in o…