Collection of several good small examples of javascript classes_js object-oriented

See the effect after running the specific function

<img id="img1" style="max-width:90%" alt="Collection of several good small examples of javascript classes_js object-oriented" > <button onclick="img1.onclick.AddFunction(f1)">Add f1</button><button onclick="img1.onclick.AddFunction(f2)">Add f2</button><button onclick="img1.onclick.AddFunction(f3)">Add f3</button> <button onclick="img1.onclick.RemoveFunction(f1)">Remove f1</button><button onclick="img1.onclick.RemoveFunction(f2)">Remove f2</button><button onclick="img1.onclick.RemoveFunction(f3)">Remove f3</button> <div id="output"></div>
[Ctrl A Select All Note: If you need to introduce external Js, you need to refresh to execute

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[Ctrl A Select all Note:

If you need to introduce external Js, you need to refresh to execute
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By the way, paste what winter wrote before
Winte come and add some comments for me when you have time

I can’t add it...

[Ctrl A Select all Note:
If you need to introduce external Js, you need to refresh to execute
]

A more powerful one<meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title> </title> New web page 1<div id="test" style="border:1px double red;width:100px;height:55px;" onclick="alert('first')"> </div> <div id="test2" onclick='alert("second")' style="border:1px double red;margin:10px;width:200px;height:100px;"> </div> click on me