please add script onError callback !

[huyansheng3]

  $script(url, function () {
      console.log('success');
    }, (error) => {
      console.log('error', error);
    })

i need the fail callback to give the user the information that something load fail!
but now it dont support !!

or maybe you can provider the event to us！

  $script(url, function (e) {
     if(e.type === 'error') {
          console.log('error')
     } else {
           console.log('success');
    }
    },)