input输入框验证的弹层优化

当一个页面多个input需要用户操作，例如问卷调查，用户往往漏掉几道题目，直接点击提交问卷，一般页面会弹层提示问卷未完成，此时用户需要自己找到哪些题没写。再重新输入，如果有好几道题目漏掉了，用户不一定能一次将漏掉的题目找全，第二次点提交，弹层再次出现。。。这样的体验是非常差的。所以我们需要在用户第一次提交的时候就告诉哪几道题没写，代码思路如下：

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<div class="demo">              <li>                  <h4>信息1</h4>                  <input type="text" name="NAME" placeholder="请输入姓名" />                  <input type="text" name="TEL" placeholder="请输入电话号码" />                  <input type="text" name="ADRESS" placeholder="请输入家庭住址" />              </li>              <li>                  <h4>信息2</h4>                  <input type="text" name="NAME" placeholder="请输入姓名" />                  <input type="text" name="TEL" placeholder="请输入电话号码" />                  <input type="text" name="ADRESS" placeholder="请输入家庭住址" />              </li>              <li>                  <h4>信息3</h4>                  <input type="text" name="NAME" placeholder="请输入姓名" />                  <input type="text" name="TEL" placeholder="请输入电话号码" />                  <input type="text" name="ADRESS" placeholder="请输入家庭住址" />                  </li>              <a href="javascript：;">提交</a>          </div>          <script src="jquery-1.8.2.min.js"></script>          <script>              $("a").click(function() {                  var errorinfo = "";                  $(".demo li").each(function(index) {                      var limessages = "";                      if($(this).find("input[name=NAME]").val() == "") {                              if(limessages == "") {                              limessages += "信息" + (index + 1) + ":";                          }                          limessages += "姓名不能为空;"                      }                          if($(this).find("input[name=TEL]").val() == "") {                          if(limessages == "") {                              limessages += "信息" + (index + 1) + ":";                          }                          limessages += "电话不能为空;"                      }                      if($(this).find("input[name=ADRESS]").val() == "") {                          if(limessages == "") {                              limessages += "信息" + (index + 1) + ":";                          }                          limessages += "地址不能为空;"                      }                      if(limessages != "") {                          errorinfo += limessages;                      }                      });                  if(errorinfo != "") {                      alert(errorinfo);                  }              });          </script>

此时页面显示效果如下：

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