npm install socket io client code example
Example 1: install socket.io
npm i socket.io
Example 2: "https://cdn.socket.io
<script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/1.4.5/socket.io.min.js"></script>
npm i socket.io
<script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/1.4.5/socket.io.min.js"></script>