HTML & Javascript, how can I make a button appear in a function? -

i'm still new html , js, want make function makes button appear on webpage... i've tried couple of things this:

html:

<span id="buttonappear"></span>

js:

function buttonfunction(){      document.getelementbyid("buttonappear").innerhtml = "<button onclick="secondfunction()">some text here</button>"; }

but of course, didn't work. i'd love hear way make happen. in advance!

it should appear. have slash innerhtml or use single quotes not mess when mixing them:

function buttonfunction(){      document.getelementbyid("buttonappear").innerhtml = '<button onclick="secondfunction()">some text here</button>'; }

Deter