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登入框(用獲取value值方法)

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <style type="text/css">
            input{
                width: 240px;
                height: 30px;
                margin-top: 10px;
            }
            .right{
                text
-align: right; } </style> <script> function check(){ var phone = document.getElementById("phone").value; var pwd = document.getElementById("pwd").value; var qr_pwd = document.getElementById("qr_pwd").value;
var nb = document.getElementById("nb").value; if(phone==null || phone==""){ document.getElementById("span_phone").innerHTML="*登入名不能為空!"; return; }else{ document.getElementById("span_phone").innerHTML="
<font style='color: green;'>√正確</font>"; } if(pwd==null || pwd==""){ document.getElementById("span_pwd").innerHTML="*密碼不能為空!"; return; }else{ document.getElementById("span_pwd").innerHTML="<font style='color: green;'>√正確</font>"; } if(qr_pwd==null || qr_pwd==""){ document.getElementById("span_qr_pwd").innerHTML="*確認密碼不能為空!"; return; }else{ document.getElementById("span_qr_pwd").innerHTML="<font style='color: green;'>√正確</font>"; } if(qr_pwd!=pwd){ document.getElementById("span_qr_pwd").innerHTML="*確認密碼和密碼不一致!"; return; }else{ document.getElementById("span_qr_pwd").innerHTML="<font style='color: green;'>√正確</font>"; } if(nb==null || nb==""){ document.getElementById("span_nb").innerHTML="*驗證碼不能為空!"; return; }else{ document.getElementById("span_nb").innerHTML="<font style='color: green;'>√正確</font>"; } //提交表單 document.getElementById("f2").submit(); } </script> </head> <body> <center>
      //注意:method="post"時Hbuilder可能會出現"內部伺服器錯誤"提示字樣!WebStrom則不會出現此問題。
      //也可將method="post"改為method="get"解決此問題
      //action="跳轉的html檔案"

<form id="f2" action="demo1.html" method="post"> <table style="border: 1px;"> <tr> <td class="right">登入名:</td> <td><input id="phone" type="text"/></td> <td><span id="span_phone" style="color: red;"></span></td> </tr> <tr> <td class="right">密碼:</td> <td><input id="pwd" type="text"/></td> <td><span id="span_pwd" style="color: red;"></span></td> </tr> <tr> <td class="right">確認密碼:</td> <td><input id="qr_pwd" type="text"/></td> <td><span id="span_qr_pwd" style="color: red;"></span></td> </tr> <tr> <td class="right">驗證碼:</td> <td><input id="nb" type="text"/></td> <td><span id="span_nb" style="color: red;"></span></td> </tr> <tr> <td colspan="3" style="text-align: center;"> <input type="button" onclick="check()" value="提交" style="width: 60px;;"/> </td> </tr> </table> </form> </center> </body> </html>