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function ClassZ(){
this.newMethod=classX;
this.newMethod();
delete this.newMethod;
this.newMethod=classY;
this.newMethod();
delete this.newMethod;
}
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function setcookie(name,value){   
    var Days = 30;   
    var exp  = new Date();   
    exp.setTime(exp.getTime() + Days*24*60*60*1000);   
    document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();   
}   
  
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    http://www.cnblogs.com/webgis8/articles/1516639.html
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