![](https://images.gutefrage.net/media/default/user/12_nmmslarge.png?v=1551279448000)
![](https://images.gutefrage.net/media/default/user/8_nmmslarge.png?v=1551279448000)
So:
var x = "hallo"; var y = "welt";
document.getElementById("demo").innerHTML = x;
document.getElementById("demo").innerHTML = document.getElementById("demo").innerHTML + y;
So:
var x = "hallo"; var y = "welt";
document.getElementById("demo").innerHTML = x;
document.getElementById("demo").innerHTML = document.getElementById("demo").innerHTML + y;