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}
function class2(){
}
class2.prototype=class1.prototype;
class2.prototype.moreProperty="xxx";
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}
var obj = new class2();
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obj instanceof class1
obj instanceof class2
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function class1(){
}
class1.prototype={
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};
         method2:function(){
                  alert("method2");
}
}
function class2(){
}
for(var p in class1.prototype){
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}
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