JavaScript implements a method of randomly reading arrays

This article describes the method of javascript to randomly read arrays. Share it for your reference. The details are as follows:

function write_quote() {
  var quotes = [
    'no animals were harmed while making this page',
    'made in ulm',
    'this page was handmade',
    'Get <a href="/products/firefox/">FireFox</a> :-)'
  ];
  var r = (() * (-1));
  // write the quote
  (quotes[r]);
  // or replace an HTML element:
  // ("quote").innerHTML = quotes[r];
}

I hope this article will be helpful to everyone's JavaScript programming.