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Adding 1 the value of input "text" every 3 seconds

Whing Dela Cruz
Last Modified: 2017-04-02
Hi experts, I want to make a function that would change the value of a certain input text, adding 1 in every 3 seconds. Please help.

<!Doctype Html>
<input type="text" id="iCount" value="0"/>

//I want here to add 1 the value of iCount every 3 seconds
var x = document.getElementById("iCount").value;
document.getElementById("txtHint").value = "" 

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