js获取和修改input的value值，改变input值触发事件

<input name="price" type="text" id="price" value="" onchange="TBbuyfen();" onpropertychange="TBbuyfen();"  oninput="TBbuyfen();">

<input name="buyfen" type="text" id="buyfen" value="" onchange="TBbuyfen();" onpropertychange="TBbuyfen();"  oninput="TBbuyfen();">

<script type="text/javascript">function TBbuyfen(){ document.getElementById('buyfen').value = document.getElementById('price').value; }</script>