原文链接
- <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
- "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
- <html xmlns="http://www.w3.org/1999/xhtml">
- <head>
-
-
- <meta name="DEscription" contect="my code demo" />
- <meta name="Author" contect="Michael@jb51.net" />
- <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
- <meta http-equiv="X-UA-Compatible" content="IE=emulateIE8">
- <title>js check file size @ jb51.net</title>
- </head>
- <body>
- < img id="tempimg" dynsrc="" src="" style="display:none" />
- <input type="file" name="file" id="fileuploade" size="40" />
- <input type="button" name ="check" value="checkfilesize" οnclick="checkfile()"/>
- </body>
- <script type="text/javascript">
- var maxsize = 210241024;//2M
- var errMsg = "上传的附件文件不能超过2M!!!";
- var tipMsg = "您的浏览器暂不支持计算上传文件的大小,确保上传文件不要超过2M,建议使用IE、FireFox、Chrome浏览器。";
- var browserCfg = {};
- var ua = window.navigator.userAgent;
- if (ua.indexOf("MSIE")>=1){
- browserCfg.ie = true;
- }else if(ua.indexOf("Firefox")>=1){
- browserCfg.firefox = true;
- }else if(ua.indexOf("Chrome")>=1){
- browserCfg.chrome = true;
- }
- function checkfile(){
- try{
- var obj_file = document.getElementById("fileuploade");
- if(obj_file.value==""){
- alert("请先选择上传文件");
- return;
- }
- var filesize = 0;
- if(browserCfg.firefox || browserCfg.chrome ){
- filesize = obj_file.files[0].size;
- }else if(browserCfg.ie){
- var obj_img = document.getElementById('tempimg');
- obj_img.dynsrc=obj_file.value;
- filesize = obj_img.fileSize;
- alert(filesize);
- }else{
- alert(tipMsg);
-
- return;
- }
- if(filesize==-1){
- alert(tipMsg);
- return;
- }else if(filesize>maxsize){
- alert(errMsg);
- return;
- }else{
- alert("文件大小符合要求");
- alert(filesize);
- return;
- }
- }catch(e){
- alert(e);
- }
- }
- </script>
- </html>
标签:文件大小,obj,img,alert,browserCfg,else,filesize,var,js
来源: https://www.cnblogs.com/sunny3158/p/12181852.html