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function Person(name) {
    this.name = name;
}
var  p = new Person();
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1. Var p = {};
2. p.[[prototype]] = Person.prototype
   //ÕâÒ»²½ÊÇα´úÂ룬ʵ¼ÊÉÏÒ»¸ö¶ÔÏóµÄÔÐͶÔÏóÊDz»ÄÜͨ¹ý´úÂëÀ´·ÃÎʵģ¬
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3. p.methodName = Person
;                  //ÕâÑùµÄ»°PersonµÄthis¾Í»áÖ¸Ïòp
   p.methodName();
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