add a style using javascript code example

Example 1: add style javascript

// Bad:
element.setAttribute("style", "background-color: red;");
// Good:
element.style.backgroundColor = "red";

Example 2: javascript style

// background-color
<element>.style.backgroundColor = '#000';
// background
<element>.style.background = '#000';
// color
<element>.style.color = '#fff';
// box-sizing
<element>.style.boxSizing = 'border-box';
// font-family
<element>.style.fontFamily = '\'Times New Roman\', Times, serif';
// font-size
<element>.style.fontSize = '16px';
// margin
<element>.style.margin = 0;
// padding
<element>.style.padding = '20px';
// width
<element>.style.width = '100%';
// height
<element>.style.height = '100%';
// margin-left
<element>.style.marginLeft = 0;
// font-weight
<element>.style.fontWeight = 400;

Example 3: style through javascript

element.style.backgroundColor = "red";   // set the background color of an element to red

Example 4: change style js

// select element from DOM
const el = document.querySelector('.para')
// change css style
el.style.color = 'purple'