js 点击按钮下载图片，另存为
js：
1 $(document).on('click',"#xiazai",function(){
2 imgurl = $(".img-box").find('img').attr('src');
3 window.open('/index/download.html?dir='+imgurl);
4 });
服务端
1 public function actionDownload($dir,$name){
2 header('Pragma: public'); // required
3 header('Expires: 0'); // no cache
4 header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
5 header('Cache-Control: private',false);
6 header('Content-Type: application/force-download');
7 header('Content-Disposition: attachment; filename="'.$name.'.jpg"');
8 header('Content-Type: application/octet-stream; name=' . $dir);
9 header('Content-Transafer-Encoding: binary');
10 header('Connection: close');
11 readfile($dir);
12 exit();
13 }
