[Solved] JavaScript for loop [closed]

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The code does not run because of the following issues

function multiple ( ). Though there is a closing } but there is no opening { which mark the start of function body.
The function body should be inside { } . Example 

function multiple() { //Rest of code}

for (i=pooya;i<=5;i++){}. This part will not work. pooya is a an id to an element & if you are assigning it to a i. If you want to do that initialize pooya with some value

document.getElementById("pooya").innerHTML = i . Are you trying to update the input box? If so then you have to use document.getElementById("pooya").value = i

In this case you will always see 5 as updated value in input box.

If you do document.getElementById("pooya").innerHTML += iyou will see
"entered value"+12345;
Example:If you give input as4the input box will be updated with4012345`

Check this JSFIDDLE

EDIT 

function multiple ( ){
var i= document.getElementById("pooya").value;  // Will take the entered value
document.getElementById("pooya").value=""; // will empty the inpt
for(i;i<=5;i++){ 
 document.getElementById("pooya").value += i; // will update input box

  }
}

Updated jsFidlle

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solved JavaScript for loop [closed]