此问题已解决.我只是改写上面给出的代码.

this issue is already solve. i've just rephrase the codes given above.

<script type="text/javascript">
    function getEmp(codename){
         var res = codename.split(" ", 1 );
        document.getElementById("codenamer").value=res;
    }
</script>

呼叫者进入我的输入字段

and caller to my input field

id="codenamer"

感谢所有受访者.