复制代码 代码如下:

//检测文件大小和类型

function fileChange(target){

//检测上传文件的类型

if(!(/(?:jpg|gif|png|jpeg)$/i.test(target.value))) {

alert("只允许上传jpg|gif|png|jpeg格式的图片");

if(window.ActiveXObject) {//for IE

target.select();//select the file ,and clear selection

document.selection.clear();

} else if(window.opera) {//for opera

target.type="text";target.type="file";

} else target.value="";//for FF,Chrome,Safari

return;

} else {

return; //alert("ok");//or you can do nothing here.

}

//检测上传文件的大小

var isIE = /msie/i.test(navigator.userAgent) && !window.opera;

var fileSize = 0;

if (isIE && !target.files){

var filePath = target.value;

var fileSystem = new ActiveXObject("Scripting.FileSystemObject");

var file = fileSystem.GetFile (filePath);

fileSize = file.Size;

} else {

fileSize = target.files[0].size;

}

var size = fileSize / 1024;

if(size>(500)){

alert("文件大小不能超过500KB");

if(window.ActiveXObject) {//for IE

target.select();//select the file ,and clear selection

document.selection.clear();

} else if(window.opera) {//for opera

target.type="text";target.type="file";

} else {

target.value="";//for FF,Chrome,Safari

}

return;

}else{

return;

}

}