How to use onclick?

Question

pls show me one example. thanks.

Answer 1

html:
<button onclick="document.write('Hello world!');">Click me!</button>

You can also define your own function and use it with onclick.
<button onclick="myFunc()">Click me!</button>
<script type="text/javascript">
function myFunc() {
document.write("Hello world!");
}
</script>

Alternative way with anonymous function:
<button onclick="(function() {document.write('Hello world!');})()">Click me!</button>

Sorry for the edits.

Answer 2

thanks bro