js判断图片文件大小

火狐:

var maxsize = 5*1024*1024;//5M
            var filesize = 0;  
            filesize =uplist[i].files[0].size;
            console.log("abc",filesize);
            if(filesize>maxsize){  //如果大于5M
                 popAlert('please less than 5M');
                return;

ie8就别想了放到后台去判断,anctionXoject, dynsrc什么的都不识别

还有一个就是获得文件的真实路径(其实没什么用,ie8又识别不了select() )

//var id = uplist[i].id+ "-file";

var file_upl = document.getElementById(uplist[i].id);
            file_upl.select();
            console.log("aaaaaa",file_upl.value);
            var realpath = document.selection.createRange().text;