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var zyName = document.getElementById("speciality");
            for(var i=0;i<zyName.options.length;i++){
             var op = zyName.options[i];
               if(op.selected){
                       document.getElementById("zymc").value=op.innerText;
               }
               }

//zyName是select控件

//zymc是隐藏域