flash alert in react js code example

Example 1: alert in php

// This is in the PHP file and sends a Javascript alert to the client
$message = "Something";
echo "<script type='text/javascript'>alert('$message');</script>";

Example 2: js alert

alert("Hello! I am an alert box!!");

Example 3: alert js in php

javascript:alert('Email enviado com Sucesso!');
javascript:window.location='index.php';