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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
  <input type="text" id="poleVvoda" value="123">
  <button id="knopka1" onclick="console.log(this.id)">first</button>
  <button id="knopka2" onclick="console.log(this.id)">second</button>
</body>
</html>
 
document.addEventListener('DOMContentLoaded', function(){
  var poleVvoda = document.querySelector('#poleVvoda');
  var knopka1 = document.querySelector('#knopka1');
  var knopka2 = document.querySelector('#knopka2');
  if (poleVvoda.value === "123"){
    knopka1.click();
  } else {
    knopka2.click();
  }
});
Output

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anonymouspro
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