JavaScript判斷用戶名和密碼不能為空的實現代碼
<script language="javascript"><!--function VF_form1(){ //v2.0<!--start_of_saved_settings--><!--type,password,name,Password,required,true,errMsg,密碼不能為空!--><!--type,text,name,User,required,true,errMsg,用戶名不能為空!--><!--end_of_saved_settings--> var theform = document.form1; var errMsg = ""; var setfocus = ""; if (theform['password'].value == "") { errMsg = "密碼不能為空!"; setfocus = "['password']"; } if (theform['username'].value == "") { errMsg = "用戶名不能為空!"; setfocus = "['username']"; } if (errMsg != ""){ alert(errMsg); eval_r("theform" + setfocus + ".focus()"); } else { theform.submit(); }} //--></script>以上這篇JavaScript判斷用戶名和密碼不能為空的實現代碼就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持武林網。