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  1. Manipulating documents - Learn web development ...

    We have reached the end of our study of document and DOM manipulation. At this point you should understand what the important parts of a web browser are with respect to controlling documents and other aspects of the user's web experience. Most importantly, you should understand what the Document Object Model is, and how to manipulate it to create useful functionality....element, add the following line: js const link = document.querySelector("a");...line below the previous one: js link.textContent = "Mozilla Developer...

    developer.mozilla.org/en-US/docs/Learn/JavaScri...
  2. SyntaxError: functions cannot be labelled - Jav...

    The JavaScript exception "functions cannot be labelled" occurs when a function declaration has a label before it....property key in an object literal: js const createObj = () => { greet:...object literal in parentheses: js const createObj = () => ({ greet:...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
  3. WeakSet - JavaScript | MDN

    A WeakSet is a collection of garbage-collectable values, including objects and non-registered symbols. A value in the WeakSet may only occur once. It is unique in the WeakSet's collection....s are ideal for this purpose: js // Execute a callback on everything...Examples Using the WeakSet object js const ws = new WeakSet(); const...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
  4. Number - JavaScript | MDN

    Number values represent floating-point numbers like 37 or -9.25.... js 255; // two-hundred and fifty-five...be converted, it returns NaN . js Number("123"); // returns the...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
  5. <script>:脚本元素 - HTML(超文本标记语言) | MDN

    HTML