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function showJSON() {   
    var user =   
     {   
        "username":"andy",   
        "age":20,   
        "info": { "tel": "123456", "cellphone": "98765"},   
        "address":   
             [   
                 {"city":"beijing","postcode":"222333"},   
                 {"city":"newyork","postcode":"555666"}   
             ]   
     }   
       
     alert(user.username);   
     alert(user.age);   
     alert(user.info.cellphone);   
     alert(user.address[0].city);   
     alert(user.address[0].postcode);   
}   
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