元素的中的实现    

中的写法           focusif(obj.disabled)

        obj.blur();

radio , checkbox:>if(obj.disabled)

       return false;;

   select:>      {

for (var i=0; i<obj.opti>{

obj.opti>       (obj.opti>这样写也可以      }

   }

,Netscape4.76

if(obj.disabled)

obj.blur();

obj.blur();

obj.blur();

obj.blur();

                    return false;

        if(obj.disabled)

                 return false;

              obj.disabled=true;

                      return false;

   if (obj.disabled)

      for (var i=0; i<obj.opti>         //obj.opti>  

document.forms[0].t3.disabled=!document.forms[0].t3.disabled;

document.forms[0].t5.disabled=!document.forms[0].t5.disabled;

document.forms[0].t7.disabled=!document.forms[0].t7.disabled;

document.forms[0].t1.value="";

document.forms[0].t5.checked=false;

document.forms[0].t7.value="";

      {

//document.forms[0].t7.opti>document.forms[0].t7.opti></script>

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