how to get element by class in javascript code example

Example 1: javascript get element by class

var elementsArray = document.getElementsByClassName("someclassname");

Example 2: get element by class

var elements = document.getElementsByClassName(names); // or:
var elements = rootElement.getElementsByClassName(names);

Example 3: how to get element by class name javascript

document.getElementsByClassName("legend").style.display="none";

Example 4: javascript get element by class

var elements = document.querySelector(".class");