'Can i somehow insert number multiple times into input? [closed]

this code while i click two times: 2
what i need: 11

<div id='one'></div>
<input type="number" id='pin'/>

<script>
document.getElementById('one').onclick = document.getElementById('pin').setUp(1);
</script>


Solution 1:[1]

<div id='one'></div>
<input type="number" id='pin'/>
<script>
var one = document.getElementById('one');
var pin = document.getElementById('pin');

one.onclick = function(){
    pin.value = pin.value + '1';
}
</script>

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Daniel