Javascript, say hello with a button, function and alert box

#javascriptAlert #javascriptButtonClick #javascriptFunction
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What is alert box in JavaScript?
How do I get alerts in JavaScript?
How you will write a JavaScript function that display an alert on the screen?
What are JavaScript functions?
What is function in JavaScript with example?
How do I make a click button in HTML?
How do I execute a function on a button click?
What does Onclick do in HTML?
How do you call a script on button click?