將base64轉換爲文件

     async   getImageFile ()   {

       let   that   =   this ;

       return   new   Promise ( async   resolve   =>   {

         this . $refs . cropper . getCropData ( async   data   =>   {

           this . model   =   true ;

           this . modelSrc   =   data ;

           function   dataURLtoFile ( dataurl ,  filename )   {

             //將base64轉換爲文件

             return   new   Promise ( async   resolve   =>   {

               var   arr   =   dataurl . split ( " , " ),

                 mime   =   arr [ 0 ]. match ( / :(. *? ); / ) [ 1 ] ,

                 bstr   =   atob ( arr [ 1 ] ),

                 n   =   bstr . length ,

                 u8arr   =   new   Uint8Array ( n );

               while   ( n -- )   {

                 u8arr [ n ]   =   bstr . charCodeAt ( n );

               }

               let   image   =   new   File ( [ u8arr ] ,   filename ,   {   type:   mime   });

               resolve ( image );

             });

           }

           let   file   =   await   dataURLtoFile ( data ,   " filename.png " );

           console . log ( file );

           var   image   =   new   FormData ();

           image . append ( " file " ,   file );

           image . append ( " contents " ,   " redOrgman " );

           that . API . getResultApi ({

             url:   " /file/upload " ,

             data:   image ,

             method:   " POST " ,

             headers:   {},

             transfer:   3 ,

             isBody:   2 ,

             callback :   function ( result )   {

               that . endLoad ();

               let   res   =   result . data ;

               if   ( res . code   ===   200 )   {

                 console . log ( res );

                 that . $toast ( " 上傳圖片成功 " );

                 that . popupVisibles   =   false ;

                 that . from . companyLogo   =   " redOrgman/ "   +   res . data [ 0 ]. fileName ;

                 lscache . set ( " redOrgFrom " ,   that . from );

               }   else   {

                 that . $toast ( " 上傳圖片失敗 " );

               }

             }

           });

         });

       });

     }