问can's关闭InfoWindow

EN

var infowindow = new google.maps.InfoWindow({
content: '<IMG BORDER="0" ALIGN="Left" SRC="test.svg">',
maxWidth: 300,
});

var infowindow1 = new google.maps.InfoWindow({
content: '<IMG BORDER="0" ALIGN="Left" SRC="test.svg">',
maxWidth: 300,
});

var infowindow2 = new google.maps.InfoWindow({
content: '<IMG BORDER="0" ALIGN="Left" SRC="test.svg">',
maxWidth: 300,
});

 var infowindow3 = new google.maps.InfoWindow({
content: '<IMG BORDER="0" ALIGN="Left" SRC="test.svg">',
maxWidth: 300,
});

 var infowindow4 = new google.maps.InfoWindow({
content: '<IMG BORDER="0" ALIGN="Left" SRC="test.svg">',
maxWidth: 300,
});

 var infowindow5 = new google.maps.InfoWindow({
content: '<IMG BORDER="0" ALIGN="Left" SRC="test.svg">',
maxWidth: 300,
});

// event handlers for clicking
google.maps.event.addListener(marker, 'click', function(){
    infowindow.open(googleMap,marker);
    infowindow.close();
});   

google.maps.event.addListener(marker1, 'click', function(){
    infowindow1.open(googleMap,marker1);
    infowindow1.close();
});   

google.maps.event.addListener(marker2, 'click', function(){
    infowindow2.open(googleMap,marker2);
    infowindow2.close();        
});   

google.maps.event.addListener(marker3, 'click', function(){
    infowindow3.open(googleMap,marker3);
    infowindow3.close();    
});   

google.maps.event.addListener(marker4, 'click', function(){
    infowindow4.open(googleMap,marker4);
    infowindow4.close();        
});   

google.maps.event.addListener(marker5, 'click', function(){
    infowindow5.open(googleMap,marker5);
    infowindow5.close();
});