如何控制上传图片的大小(急!!!!)

Question

KB File.Size/1024
MB File.Size/(1024*1024)

Answer 1

用JAVASCRIPT:放在BODY中
<div id="showimg" style="position:absolute; left:100px; top:180px; z-index:1; visibility: hidden;" onClick="this.style.visibility='hidden';"><img name="spic" id="spic" src="" title="单击隐藏"></div>
<form action="****" method="post" enctype="multipart/form-data" name="up">
<input name="file" type="file" size="25">
<input type="button" name="Submit" value="上 传" onClick="Getimg(this.form);">
</form>
<script language="JavaScript" type="text/JavaScript">
<!--function Getimg(f){
if (f.file.value==""){
alert("请选择上传图片！");
return;
}
document.all.spic.src = "";
document.all.spic.src = f.file.value;
if (showimg.style.visibility != "visible"){
showimg.style.visibility = "visible";
}
setTimeout(Getsize,2000); //时间差是让页面载入图片,图片太大需要时间长一点
}
function Getsize(){
if (document.all.spic.width>=450){
alert("图片宽度不能大于450像素");
showimg.style.visibility = "hidden";
return;
}
if (document.all.spic.height>=450){
alert("图片高度不能大于450像素");
showimg.style.visibility = "hidden";
return;
}
document.up.fw.value=document.all.spic.width;
document.up.fh.value=document.all.spic.height;
document.up.submit();
}
-->
</script>