<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <script type="text/javascript"> function checkDatas(obj){ if(obj.username.value=='' || obj.password.value==''){ alert('用户名或密码不可为空！'); return false; }else{ if(obj.password.value!==obj.rpassword.value){ alert('请确认两次输入密码是否一致！'); return false; }else{ return true; } } } </script> </head> <body> <form action="./2.php" method="post" onsubmit="return checkDatas(this);"> <table> <tr> <td>用户名：</td> <td><input type="text" name="username" value="" /></td> </tr> <tr> <td>密码：</td> <td><input type="password" name="password" value="" /></td> </tr> <tr> <td>确认密码：</td> <td><input type="password" name="rpassword" value="" /></td> </tr> <tr> <td>仅可输入小数点和数字：</td> <td><input type="text" name="num01" value="" onkeyup="this.value=this.value.replace(/[^d.]/g,'');" /></td> </tr> <tr> <td>仅可输入负号、小数点和数字：</td> <td><input type="text" name="num02" value="" onkeyup="this.value=this.value.replace(/[^d.-]/g,'');" /></td> </tr> </table> <input type="submit" value="登录"> </form> </body> </html>