通过JS动态创建和删除HTML元素

<script type="text/javascript" language="Javascript">
function InputOnBlur()
{        var name=document.getElementById("name").value;

if(name.length >10 || name.length<2)
             {
                var element=document.getElementById("message");
            if(element)
            {
            //alert(element.parentNode.innerHTML);
            element.parentNode.removeChild(element);
            }
                             var MySpan=document.createElement("span");
                             document.getElementById("containers").appendChild(MySpan);
                             MySpan.id = "message";
                             MySpan.innerHTML = "<img src='false.jpg' alt='请输入正确的姓名'/>请输入正确的姓名";
                }
                
         else{
            var element=document.getElementById("message");
            if(element)
            {
            //alert(element.innerHTML);
            element.parentNode.removeChild(element);
            }
                             var MySpan=document.createElement("span");
                             document.getElementById("containers").appendChild(MySpan);
                             MySpan.id = "message";
                             MySpan.innerHTML = "<img src='true.gif' alt='该用户名输入正确'/>该用户名输入正确";
                    }
}
</script>

 

 

<div>    
姓名：<input id="name" type="text" onblur="InputOnBlur()" /><span id="containers"></span></div>    
<script language="javascript">    
document.getElementById("containers").innerHTML = "<font color=red>请输入姓名</font>";    
</script>