<script language="javascript">
var img=null;
function s()
{
if(img)img.removeNode(true);
img=document.createElement("img");
//img.style.position="absolute";
// img.style.visibility="hidden";
// img.attachEvent("onreadystatechange",orsc);
// img.attachEvent("onerror",oe);
// document.body.insertAdjacentElement("beforeend",img);
img.src=document.product.FilePath.value;
alert(img.fileSize)
}
function oe()
{
alert("上传图片类型为:GIF、JPEG/JPG、BMP");
}
function orsc()
{
if(img.readyState!="complete")return false;
else
alert(img.fileSize)
}
</script>
<body leftmargin="0" topmargin="0">
<form name="product">
上传图片<input type=file name="FilePath" size=8 onpropertychange="return s();">
</form>
var img=null;
function s()
{
if(img)img.removeNode(true);
img=document.createElement("img");
//img.style.position="absolute";
// img.style.visibility="hidden";
// img.attachEvent("onreadystatechange",orsc);
// img.attachEvent("onerror",oe);
// document.body.insertAdjacentElement("beforeend",img);
img.src=document.product.FilePath.value;
alert(img.fileSize)
}
function oe()
{
alert("上传图片类型为:GIF、JPEG/JPG、BMP");
}
function orsc()
{
if(img.readyState!="complete")return false;
else
alert(img.fileSize)
}
</script>
<body leftmargin="0" topmargin="0">
<form name="product">
上传图片<input type=file name="FilePath" size=8 onpropertychange="return s();">
</form>
<script>
var filesize=0;
function checkform(){
var str=document.form1.photo.value
var ext=str.substring(str.length-3,str.length).toLowerCase()
if(ext!='gif' && ext!='jpg' && ext!='bmp' && ext!='png'){
alert('必须是gif，jpg，bmp或png格式的图片！')
document.form1.photo.focus();
return false;
} upload_check();
}var img=null;
function upload_check(){
if(img) img.removeNode(true);
img=document.createElement("img");//创建一个<img...>对象
img.style.position="absolute";//设置图片位置属性
img.style.visibility="hidden";//设置图片显示/隐藏属性
img.attachEvent("onreadystatechange",imgSize);//绑定函数到事件
img.attachEvent("onerror",err);
document.body.insertAdjacentElement("beforeend",img);//插入img对象到body
img.src=document.form1.photo.value;//设置图片src属性
}function err(){//出错处理
alert("cant load img");
}function imgSize(){
if(img.readyState!="complete")return false;
filesize=img.fileSize;//用obj.fileSize获取上传文件的大小
if(filesize>=(1024*1024)){//判断文件大小
alert('图片文件必须小于1M，请重新选择！');
document.form1.photo.focus();
return false;
}
document.form1.submit();
}
</script>
</head>
<body>
<form name="form1" action="">
照片：<input type="file" name="photo" value="" onchange="checkform();">
</form>
</body>
这类有有效限制的代码,我们都是放在server 里面的,js只是作效果而用的
else
alert(img.fileSize)
} 当上传小于一M图片的时候 img.readyState 一直等于 uninitialized ，请教高手