同步文本框内容的JS代码

图例1

<html>
<body>
<script language="JavaScript" type="text/javascript">
    function addEvent(eventHandler)
    {
        var tags = document.getElementsByTagName('input');
        for(var i=0;i<tags.length;i++)
        {
            if(tags[i].getAttribute('url') == 'true')
            {
                if(tags[i].addEventListener)
                {
                    tags[i].addEventListener('keyup',eventHandler,true);
                }
                else
                {
                    tags[i].attachEvent('onkeyup',eventHandler);
                }
            }
        }
    }
    function addInput(e)
    {
        var obj = e.target ? e.target : e.srcElement;
        var tags = document.getElementsByTagName('input');
        for(var i=0;i<tags.length;i++)
        {
            if(tags[i].getAttribute('url') == 'true'&&tags[i]!=obj)
            {
                tags[i].value = obj.value;
            }
        }
    }
    window.onload = function()
    {
        addEvent(addInput);
    }
</script>

<p>
  <input id="addr_more1" size="35" value="" name="addr_more1" url="true" />
</p>
<p>
  <input id="addr_more2" size="35" value="" name="addr_more2" url="true" />
</p>
<p>
  <input id="addr_more3" size="35" value="" name="addr_more3" url="true" />
</p>
<p>
  <input id="addr_more4" size="35" value="" name="addr_more4" url="true" />
</p>

</body>
</html>

图例2

<html>
<head>
<script type="text/javascript" src="jquery-1.4.4.min.js"></script>
    <script type="text/javascript">
    function getNM(id)
        {
            var name2 = $("#"+id+"").val();
            if (name2 != "") {
            for(var i=3;i<6;i++)
                $("#NM"+i+"").val(name2);
            }
        }
    </script>
</head>
<body>
    <input type="text" id="NM1" value="" />
    <input type="text" id="NM2" value="" />
    <input type="text" id="NM3" value="" onkeyup="getNM(this.id)"/>
    <input type="text" id="NM4" value="" onkeyup="getNM(this.id)"/>
    <input type="text" id="NM5" value="" onkeyup="getNM(this.id)"/>
</body>
</html>

需要引用 <script type="text/javascript" src="jquery-1.4.4.min.js"></script>