How to open a alert box within anchor tag <a href>?

You can also use the following codes:

<a href="#" id="link">Link</a>

Javascript:

$(document).on("click","#link",function(){
 alert("I am a pop up ! ");
});

OR:

<a href="#" onclick="alert('I am a popup!');">Link</a>

Without using a JS file (purely as an alternative to answers already posted):

<a href="http://example.com" onclick="alert('Hello world!')">Link Text</a>

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