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  2¡¢ÒÔÏÂÄĸöµ¥´Ê²»ÊôÓÚjavascript±£Áô×Ö£º£¨B£©  
  A. with  
  B. parent  
  C. class  
  D. void  
  3¡¢ÇëÑ¡Ôñ½á¹ûÎªÕæµÄ±í´ïʽ£º£¨C£©  
  A. null   instanceof   Object  
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  4¡¢ÇëÑ¡Ôñ¶ÔjavascriptÀí½âÓÐÎóµÄ£º(ABCD)  
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javascript Ö® Closure

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function a() {
var i = 0;
function b() {
alert(++i);
}
return b;
}
var c = a();
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