日期:2014-05-16 浏览次数:20414 次
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
div{display:none;}
</style>
<body>
<div>
    <input type="text" />
    <input type="text" />
</div>
<div>
    <input type="text" />
    <input type="text" />
</div>
<div>
    <input type="text" />
    <input type="text" />
</div>
<input type="button" value="click me" id="btn" />
<script type="text/javascript">
    var divs = document.getElementsByTagName('div');
    var count = 0;
    document.getElementById('btn').onclick = function(){
        if(divs[count]){
            divs[count].style.display = 'block';
            count++;
        }
    };
</script>
</body>
</html>
------解决方案--------------------
<!DOCTYPE html>
<html>
<head>
  <script src="jquery162.js"></script>
</head>
<body>
<input type="button" value="点击添加" onclick="show()"/>
<hr style="display:none"/>
<input type="text" style="display:none" id="txt"/>
<input type="text" style="display:none" id="txt"/>
<hr style="display:none"/>
<input type="text" style="display:none" id="txt"/>
<input type="text" style="display:none" id="txt"/>
<hr style="display:none"/>
<input type="text" style="display:none" id="txt"/>
<input type="text" style="display:none" id="txt"/>
<input type="button" value="点击隐藏" onclick="hide()"/>
<script>
var i=1;
var texts=document.getElementsByTagName('input');
var hrs=document.getElementsByTagName('hr');
function show(){
if(i<=6){
var j=(i-1)/2;
    hrs[j].style.display='block';
    texts[i].style.display='block';
    texts[++i].style.display='block';
    i++;
}
}
function hide(){
    if(i>2){
    j=(i-2)/2;
    hrs[j].style.display='none';
    texts[--i].style.display='none';
    texts[--i].style.display='none';
    
    }
}
</script>
</body>
</html>