<form name="myform" action="javascript:alert('注册成功！');" method="post" onsubmit="return yanzheng();">
  <table width="500px">
    
    <tbody>
      <tr>
        <td>
          用户名：
        </td>
        <td>
          <input name="username" id="username" type="text" />
        </td>
        <td align="left">
          <p style="color: #FF0000">*用户名长度在6-10之间</p>
        </td>
      </tr>
      <tr>
        <td>
          密 码：
        </td>
        <td>
          <input id="password" onchange="passwordleave()" type="password" />
        </td>
        <td align="left">
          <p style="color: #FF0000">*
          <input id="Button1" type="button" value="弱" style="background-color: #FF0000" />
          <input id="Button2" type="button" value="中" style="background-color: #FF0000" />
          <input id="Button3" type="button" value="强" style="background-color: #FF0000" />
          <label id="lavel"></label>
          </p>
          </td>
      </tr>
      <tr>
        <td>
          年 龄：
        </td>
        <td>
          <input id="age" type="text" />
        </td>
        <td align="left">
          <p style="color: #FF0000">*</p>
        </td>
      </tr>
      <tr>
        <td>
          性 别：
        </td>
        <td>
          <input name="sex" type="radio" value="男" checked="checked" />男
          <input name="sex" type="radio" value="女"/>女
        </td>
        <td align="left">
          <p style="color: #FF0000">*</p>
        </td>
      </tr>
      <tr>
        <td>
          内 容：
        </td>
        <td>
          <input type="checkbox" name="content" value="新闻" />新闻
          <input type="checkbox" name="content" value="娱乐" />娱乐
          <input type="checkbox" name="content" value="教育" />教育
        </td>
        <td align="left">
          <p style="color: #FF0000">*</p>
        </td>
      </tr>
      <tr>
        <td>
          学 历：
        </td>
        <td>
          <select name="edu_level" style="width: 74px">
            <option value="1">小学</option>
            <option value="2">中学</option>
            <option value="3">大学</option>
            <option value="4">大学以上</option>
          </select>
        </td>
        <td align="left">
          <p style="color: #FF0000">*</p>
        </td>
      </tr>
      <tr>
        <td>
          爱 好：
        </td>
        <td>
          <select name="like" size="6" multiple="multiple" 
            style="width: 72px; height: 108px">
            <option value="1">篮球</option>
            <option value="2">足球</option>
            <option value="3">排球</option>
            <option value="4">跑步</option>
            <option value="5">登山</option>
            <option value="6">健美</option>
          </select>
        </td>
        <td align="left">
          <p style="color: #FF0000">*</p>
        </td>
      </tr>
      <tr>
        <td>
          
          <input id="Button4" type="button" onclick="checkinfo()" value="查看信息" /></td>
        <td>
          <input type="submit" name="tijiao" value="注册" />
        </td>
        <td>
          <input type="reset" name="reset" value="重置" />
        </td>
      </tr>
    </tbody>
  </table>
  </form>

<script type="text/javascript">  
       function yanzheng() {
         var b;
         var a = document.getElementById("username"); //获取用户名值
         var p = document.getElementById("password");  //获取密码值
         var age = myform.age.value;  //获取年龄值

         if (a.value.length < 5 || a.value.length > 10) {
           alert("您输入的用户名格式错误！");
           return false;
         }
         else if (p.value.length < 5) {
           alert("密码长度少于5！");
           return false;
         }
         else if (!checkage(age)) {
           return false;
         }
         else {
           return true;
         }

       }

       function checkage(a) {     //检测年龄
         var ch, age;
         for (var i = 0; i < a.length; i++) {
           ch = a.charAt(i);
           if (ch < "0" || ch > "9") {
             alert("请在年龄选项中输入数字！");
             return false;
           }
         }
         age = parseInt(a);
         if (age < 10 || age > 100) {
           alert("年龄不真实！");
           return false;
         }
         return true;

       }

       function checkinfo() {       //显示所有的信息
         var username = myform.username.value; //获取用户名
         var password = myform.password.value; //获取密码
         var age = myform.age.value;    //获取年龄

         var sex = myform.sex;   //获取性别
         var osex = "";    //设置一个变量获取性别的选项

         var content = myform.content; //获取内容
         var ocontent = ""; //设置一个变量获取内容的选项

         var eduleave = myform.edu_level;    //获取学历
         var oedu = ""; //设置一个变量获取学历的选项

         var intersent = myform.like;      //获取表单爱好
         var olike = ""; //设置一个变量获取爱好的选项

         for (var i = 0; i < sex.length; i++) {     //性别
           if (sex[i].checked) {
             osex = sex[i].value;
           }
         }

         for (var i = 0; i < content.length; i++) {   //内容
           if (content[i].checked) {
             ocontent += content[i].value + " ";
           }
         }

         for (var i = 0; i < eduleave.length; i++) {  //学历
           if (eduleave.selectedIndex >= 0) {
             oedu = eduleave.options[eduleave.selectedIndex].text;
           }
         }

         for (var i = 0; i < intersent.length; i++) {    //爱好
           if (intersent.options[i].selected) {
             olike += intersent.options[i].text + " ";
           }
         }

         alert("您的用户名为：" + username + "\n密码为：" + password + "\n年龄为：" + age + "\n性别为：" + osex + "\n内容为：" + ocontent + "\n学历为：" + oedu + "\n兴趣爱好为：" + olike);

       }


       function passwordleave() {
         var passwordleavel = myform.password.value;
         if (passwordleavel.length == "") {
           document.getElementById("Button1").style.display = "none";
           document.getElementById("Button2").style.display = "none";
           document.getElementById("Button3").style.display = "none";
         }
         else {
           if (passwordleavel.length <= "5") {
             document.getElementById("Button1").style.display = "";
             document.getElementById("Button2").style.display = "none";
             document.getElementById("Button3").style.display = "none";
           }
           else if (passwordleavel.length <= "10") {
             document.getElementById("Button1").style.display = "";
             document.getElementById("Button2").style.display = "";
             document.getElementById("Button3").style.display = "none";
           }
           else {
             document.getElementById("Button1").style.display = "";
             document.getElementById("Button2").style.display = "";
             document.getElementById("Button3").style.display = "";
           }
         }
       }

       function startbody() {
         document.getElementById("Button1").style.display = "none";
         document.getElementById("Button2").style.display = "none";
         document.getElementById("Button3").style.display = "none";
       }

     </script>