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    o.name="hello";
    alert(o.name);    //Êä³ö“hello”
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    alert(o.name);   //Êä³ö“undefined” .
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          function doAdd(){
               if(argument.lenght==1){
                   alert(argument[0]+10);
               }else if(argument.lenght==2){
                   alert(argument[0]+argument[1])
               }
          }
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