如题，代码为

var path = req.files.avatar.path;
var originImg = imageMagick(path);
exec('chmod 777 '+path,function(err){
    if(err) console.log(err);
    else{
        originImg.resize(250, 250)
        .autoOrient()
        .write('public/images/'+req.files.avatar.name,function(err){
            if(err) console.log(err);
            else res.send({status:1});;
        })
    }
})

求大神解答！