How to Clear Markers Added to Maps in Leaflet

onMapMoved=function(e){
  map.removeLayer(markerList);
  var url="https://api.twitter.com/1.1/search/tweets.json";
  varsearchKeywords=get_search_keywords();

  if(searchKeywords.length>0){
      searchKeywords.forEach(function output(searchKeywords){
          since_id = null;
          getTwitter(url,searchKeywords);
      });
  }
};

 function update(data){// argument(data) contains the retrieved data
varbounds, distance1, distance2, r, southWest;
varbounds = map.getBounds();
varcenter=bound.getCenter();
var southWest=bound.getSouthWest();
var distance1 = bound.getNorthWest().distanceTo(SouthWest)/1000;
var distance2 = bound.getSouthEast().distanceTo(SouthWest)/1000;
var=distance1<distance2?distance1:distance2;
r* = 0.5;
r = Math.floor(r*10)/10;

$("#tweetDisplay").empty();// Empty the display area
$("#tweetDisplay").append('<br>');
vargeoFlag = 0;

$("#tweetDisplay").append("<p style='border:medium solid'>Twitter (radius from center of map"+r+"km)</p>);

var result=data.status;// Get what you need in the method chain from the retrieved data

// Get latitude and longitude only if it is Tweet with Geo tag from Twitter and plot the marker on the map
for (vari=0;i<result.length;i++){
    var name=result[i].user.name;// Name of the person who tweeted
    var account=result[i].user.screen_name;// The account name of the person who tweeted
    varimgsrc=result[i].user.profile_image_url;// profile image of the person who tweeted
    // var content=result[i].text;//Tweet Contents
    var contents = AutoLink (result[i].text); // If there is a URL in the tweet, skip to the link
    var updated=result[i].created_at;// Tweeted time

    US>vartweet;

    // Add the retrieved data to the Tweet display area
    tweet="<a href='https://twitter.com/"+account+"'>img src='"
            + imgsrc+"'>/a>"+"<p>"+'ID:'+name+'@'+account
            + "<br>"+contents+"<br>";

    if(result[i].coordinates){
        geoFlag = 1;
        var coordinates=result[i].coordinates.coordinates;// Tweet latitude and longitude information
        tweet+=' latitude: '+coordinates[1]+', longitude: '+coordinates[0]
                + "<br>"+'Time:'+updated+"<br>/p>";
        $("#tweetDisplay").append(tweet);
        varicon=L.icon({
            iconUrl —imgsrc,
            iconSize: [20,22]
        });
        marker = L.marker([coordinates[1], coordinates[0]], {
            icon —icon
        }).addTo(map);
        markerList.push(marker);
    } else{
        tweet+='Time:'+updated+"<br>/p>";
        $("#tweetDisplay").append(tweet);
    }
    if(i!=count-1){
        $("#tweetDisplay").append("</p><hr noshade size='7'>");
    }
}
if(geoFlag===0){
    alert('Geo tagged tweets were not detected.');
}
}