That's quite easy. You don't need any extra javascript files for this...

javascript Code: 
  1. import QtQuick 1.1
  2.  
  3. Rectangle {
  4.  id: root
  5.  width: 600
  6.  height: 400
  7.  
  8.  property int score: 0
  9.  
  10.  Text {
  11.    id: txt
  12.    anchors.top: parent.top
  13.    anchors.left: parent.left
  14.    anchors.margins: 16
  15.    text: score
  16.  }
  17.  
  18.  Rectangle {
  19.    anchors.left: parent.left
  20.    anchors.right: parent.right
  21.    anchors.top: txt.bottom
  22.    anchors.bottom: parent.bottom
  23.    color: "lightyellow"
  24.  
  25.    Rectangle {
  26.      width: 100
  27.      height: 100
  28.      radius: width/2
  29.      anchors.centerIn: parent
  30.      color: "blue"
  31.  
  32.      MouseArea {
  33.        anchors.fill: parent
  34.        hoverEnabled: true
  35.        onExited: root.score = root.score+1
  36.      }
  37.    }
  38.  }
  39.  
  40. }
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