localStorage clear function with exceptions

clearStorage.js

clearStorage = function(exceptions){
  var storage = localStorage
  var keys = [];
  var exceptions = [].concat(exceptions) //prevent undefined

  //get storage keys
  $.each(localStorage, function(key, val) {
    keys.push(key);
  });

  //loop through keys
  for( i=0; i<keys.length; i++ ){
    var key = keys[i]
    var deleteItem = true
    //check if key excluded
    for( j=0; j<exceptions.length; j++ ){
      var exception = exceptions[j];
      if( key == exception ) deleteItem = false;
    }
    //delete key
    if( deleteItem ){
      localStorage.removeItem(key)
    }
  }
}

ty