其本质就是BaseObject中的this为新建的obj的this,这个this与之前被赋予的Food的this是没有任何关联的 https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/call bind Thebind()method creates a new function that, when called, has itsthiskeyword set to the provided va...
JavaScript 'this' keyword By: Rajesh P.S.In JavaScript, the this keyword is a special context-sensitive variable that refers to the current execution context or the object that a function is bound to at runtime. The value of this depends on how a function is invoked, and it plays a ...
JavaScript 'this' keyword: Here, we are going to learn about the 'this' keyword in JavaScript with examples.
It’s probably safe to say that the this keyword is one of the most misunderstood parts of JavaScript. Admittedly, I used to throw the this keyword around until my script worked and it confused the hell out of me (and still confuses many other JS developers). It wasn’t until I ...
The first thing you need to ask yourself whenever you're trying to figure out what the this-keyword is, is this question.Where is this function invoked? We won't know what the this-keyword is in a function until that function is invoked. ...
<span class="hljs-keyword">if</span>(<span class="hljs-literal">true</span>) {<br> <span class="hljs-built_in">console</span>.log(<span class="hljs-keyword">this</span>) <span class="hljs-comment">// returns window object</span><br>}<br><br><span>let</span> i = <...
In JavaScript, thethiskeyword refers to anobject. Thethiskeyword refers todifferent objectsdepending on how it is used: In an object method,thisrefers to theobject. Alone,thisrefers to theglobal object. In a function,thisrefers to theglobal object. ...
In JavaScript, as in most object-oriented programming languages,thisis a special keyword that is used within methods to refer to the object on which a method is being invoked. ——jQuery Fundamentals (Chapter 2), by Rebecca Murphey 值得注意,该关键字在Javascript中和执行环境,而非声明环境有关。
通过this直接访问到methods里面的函数的原因是:因为methods里的方法通过 bind 指定了this为 new Vue的实例(vm)。通过 this 直接访问到 data 里面的数据的原因是:data里的属性最终会存储到new Vue的实例(vm)上的 _data对象中,访问 this.xxx,是访问Object.defineProperty代理后的 this._data.xxx。
jsCopy to Clipboard function getThis() { return this; } // 仅用于演示——你不应该修改内置的原型对象 Number.prototype.getThis = getThis; console.log(typeof (1).getThis()); // "object" console.log(getThis() === globalThis); // true ...