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<script>
var testvar = 'windowÊôÐÔ';
var o3 = {
  testvar:'3',
  testvar2:'3**',
  fun:function(){
  alert('o3: '+this.testvar);//ÎÊÌâÒ»¡¢½á¹ûÊÇ3£¬ÄÇÕâ¸öthis´ú±íµÄÊÇo3»¹ÊÇwindow£¿
  inner = function(){
alert('o3-inner: '+this.testvar);//ÎÊÌâ¶þ¡¢½á¹ûÊÇ'windowÊôÐÔ'£¬ÕâÀïΪʲôÊÇÕâ¸ö½á¹û£¬3ÒѾ­¸²¸ÇÁËÈ«¾ÖµÄÄǸötestvarÁËѽ£¿
alert('o3-inner: '+this.testvar2);//ÎÊÌâÈý¡¢½á¹ûÊÇundefined£¨Î´¶¨Ò壩£¬Õâ¸ö½á¹û¾Í¸üÏë²»À´Ô­ÒòÁË£¿
  };
  inner();
  }
};
o3.fun();

var aa = function(){
testvar=3;
testvar2=4;
fn = function(){
  alert('o3: '+this.testvar);
  var inner = function(){
alert('o3-inner: '+this.testvar);
alert('o3-inner: '+this.testvar2);
  };
  inner();
  }
}
var obj = new aa();
//obj.fn();ÎÊÌâËÄ¡¢ÕâÑù²»Äܵ÷Ó㬶øÓÃwindow¾Í¿ÉÒÔ£¬ÎªÊ²Ã´»áÕâÑù£¿
window.fn();
</script>
Ò». µ±È»ÊÇÖ¸o3, µ¯³öÀ´µÄ½á¹ûÒѾ­¸æËßÄãÁË
¶þ. thisÊÇÖ¸window, this.testvar ÊǶ¨ÒåÔÚÍ·ÐеÄÄǸötestvar
Èý. Ô­Òòͬ¶þ, windowÏÂÃæ²¢Ã»Óж¨Òåtestvar2
ËÄ. Èç¹û°ÑfnÃ÷È·Ö¸¶¨ÎªaaÀïµÄ·½·¨,
    var aa = function(){
        this.fn


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