JavaScript オブジェクト指向のプライベート静的変数インスタンス分析_JavaScript スキル

<script language="javascript" type="text/javascript">
var JSClass = (function() {
 var privateStaticVariable = "私有静态变量";
 var privateStaticMethod = function() {
  alert("调用私有静态方法");
 };
 return function() {
  this.test1 = function() {
   return privateStaticVariable;
  }
  this.test2 = function(obj) {
   privateStaticVariable = obj;
  }
  this.test3 = function() {
   privateStaticMethod();
  }
 };
})();
var testObject1 = new JSClass();
var testObject2 = new JSClass();
alert(testObject1.test1());
testObject1.test2("改变的私有静态变量");
alert(testObject2.test1());
testObject2.test3();
</script>