Как сделать кнопки + и - для edit? [закрыто]

function change(delta) { 
    var input = document.getElementById("input"); 
    input.value = parseInt(input.value) + delta; 
}

<button onclick="change(-1);">-</button> 
<input id="input" type="text" value ="1" /> 
<button onclick="change(1);">+</button>

$(function(){ 
  $('#minus').click(function(){ 
    var k = parseFloat($('#znach').val()); 
    if(k>1){ 
    k = k-1; 
      } 
    $('#znach').val(k); 
    }); 
   
  $('#plus').click(function(){ 
    var k = parseFloat($('#znach').val()); 
    k = k+1; 
    $('#znach').val(k); 
    }); 
  });

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
<form action=""> 
  <div class="pole"> 
    <span class="minus"> 
<button type="button" id="minus">-</button> 
</span> 
    <input type="text" value="1" id="znach"> 
    <span class="plus"> 
<button type="button" id="plus">+</button> 
</span> 
  </div> 
</form>