Uncaught ReferenceError: is not defined at HTMLImageElement.onclick (<anonymous>:2:1) code example

Example: Uncaught ReferenceError: function is not defined at HTMLUnknownElement.onclick

//Your program can't find the function so do this.

//You can assign the button onclick as an id.
//then attach an eventListener on run time like this:

<button id="btn">Click me!</button>

var btn = document.getElementById("btn");
btn.addEventListener("click", function() {
	//Do something here
}, false);