js 图片上传前大小长宽验证代码

脚本如下：

<meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> <table width="90%" border="0" cellspacing="0" cellpadding="0"><tr> <td> <img onerror="this.src='/statics/superweb999/images/image_error.jpg'"id="picdemo" src="/default/index/img?u=" alt="js 图片上传前大小长宽验证代码" title="js 图片上传前大小长宽验证代码"> </td> <td> <input type="file" id="file" onchange="document.all.picdemo.src=this.value" class="allinput">  <input type="submit" name="submit" value="上传" onclick="getimginfo();"> </td> </tr></table>
[ctrl+a 全选 注:如需引入外部js需刷新才能执行]