Posts

DOM Selector Method

• document.getElementById() returns one element with the id
• document.getElementsByClassName() returns a node list (not an array)
• document.getElementsByTagName() returns a node list (not an array)
• document.querySelector() returns the first match

DOM Manipulation

change style

• el.style.color = ‘blue’;
• el.style.marginTop = ‘200px’;

change CSS Class to an element

• el.classList.add(‘CSSclassname’);
• el.classList.remove(‘CSSclassname’);
• el.classList.toggle(‘CSSclassname’);

Execution context is a very important concept in Javascript. The article is for me to try to explain it so that it deepens my understanding.

• Global Execution Context Global Execution Context creates a global object (window object). The ‘this’ keyword in global execution context refers to the global object. Global execution context is not inside a function

• Hoisting

functional programming

some common Javascript interview questions