原因是你没有等到图片加载完成就执行后续操作了function CheckForm(theForm)
{
var fileext=theForm.zhaopian_up.value.substring(theForm.zhaopian_up.value.length-4,theForm.zhaopian_up.value.length)
fileext=fileext.toLowerCase() if (!(fileext=='.jpg' || fileext=='.png'))
{
alert("对不起,不正确的照片文件,必须为*.jpg或*.png文件 !");
theForm.zhaopian_up.focus();
return false;
} var s = document.form1.zhaopian_up.value;
if(s=="")return false;
var img = new Image();
img.onload = function() { fileSize=this.fileSize;}
img.src = s;
// alert("高 = "+ img.height + "\n宽 = "+ img.width);
// alert("fileSize = "+ img.fileSize +" 字节"); //这句如果不注释掉,就可以正常使用
document.write(fileSize);
if(img.fileSize>=1000)
{
alert("文件超出规定大小");
return false;
}
return true;
}
{
var fileext=theForm.zhaopian_up.value.substring(theForm.zhaopian_up.value.length-4,theForm.zhaopian_up.value.length)
fileext=fileext.toLowerCase() if (!(fileext=='.jpg' || fileext=='.png'))
{
alert("对不起,不正确的照片文件,必须为*.jpg或*.png文件 !");
theForm.zhaopian_up.focus();
return false;
} var s = document.form1.zhaopian_up.value;
if(s=="")return false;
var img = new Image();
img.onload = function() { fileSize=this.fileSize;}
img.src = s;
// alert("高 = "+ img.height + "\n宽 = "+ img.width);
// alert("fileSize = "+ img.fileSize +" 字节"); //这句如果不注释掉,就可以正常使用
document.write(fileSize);
if(img.fileSize>=1000)
{
alert("文件超出规定大小");
return false;
}
return true;
}
那..你当中加的img.onload = function() { fileSize=this.fileSize;}可以再延长一点时间吗?谢谢,再次感谢....
{
var fileext=theForm.zhaopian_up.value.substring(theForm.zhaopian_up.value.length-4,theForm.zhaopian_up.value.length)
fileext=fileext.toLowerCase() if (!(fileext=='.jpg' || fileext=='.png'))
{
alert("对不起,不正确的照片文件,必须为*.jpg或*.png文件 !");
theForm.zhaopian_up.focus();
return false;
} var s = document.form1.zhaopian_up.value;
if(s=="")return false;
flag = false;
var img = new Image();
img.onload = function() { fileSize=this.fileSize;flag=true;}
img.src = s;
// alert("高 = "+ img.height + "\n宽 = "+ img.width);
// alert("fileSize = "+ img.fileSize +" 字节"); //这句如果不注释掉,就可以正常使用
while(!flag)
{
;//do nothing
}
document.write(fileSize);
if(img.fileSize>=1000)
{
alert("文件超出规定大小");
return false;
}
return true;
}加个循环就可以了~