Use this code for spamming a particular message using whatsapp web.
STEPS TO USE:
Step 1. Open WhatsApp web in your browser and select a contact to which you have to send a spam message. Step 2. Open your browser console using ctrl + shift + I. Step 3. Copy this code and paste it in console and hit Enter. Step 4. There will be an alert message on the top of browser and write your message that you have to send in the text box and hit enter. Step 5. There will again appear a alert message in which write how many time you want to spam that particular message.