javasript 实现file图片预览
<cript type="text/javacript">function changeFile(){var Outid=document.getElementById('imgout');Outid.src=document.getElementById('title_picture').value;var Nimg=new Image();Nimg.src =document.getElementById('title_picture').value;Outid.height=Nimg.height;Outid.width=Nimg.width;if(Nimg.height != 110 || Nimg.width != 110){alert("上传图片大小必须为：200x150，请重新选择图片！");Outid.style.display='none';document.getElementById('title_picture').value='';}else{Outid.style.display='block';}}</cript> <div id="picture_confirm" align="left"><tr height=30> <td width="10%" height="35" nowrap><b>发布为图片标题:</b></td> <td background="../images/leftbg2.gif" align='left' colspan="3"> <input type="file" id="title_picture" name="title_picture" size="35" value="" onchange="changeFile();"><font color="red"> 注：请上传（110*110）的图片！</font> </td> </tr> <tr><td width="10%" height="35" nowrap><b>预览:</b></td><td background="../images/leftbg2.gif" align='left' colspan="3"><img src="" id="imgout" border="1" style="display:none;" /></td></tr></div>?