Why the output is coder?

Question

<div id ="test"></div>
<script>
var a =document.getElementById("test");
a.innerHTML="hello";
a.innerHTML="CODER!";
</script>

Answer 1

if you want the output is helloCODER!, concat the both a variable

<div id ="test"></div>
<script>
var a =document.getElementById("test");
a.innerHTML="hello";
a.innerHTML+="CODER!";
</script>

Answer 2

CODER was overwrite hello

Answer 3

a.innerHTML = "CODER!" is overwriting previous value of a.innerHTML

Answer 4

u want output hello CODER u need use "+="

Answer 5

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