JS实现留言板功能[楼层效果展示]

功能实现：

1.发布人和发布内容非空校验
2.编辑删除功能
3.楼层效果展示
4.发布时间展示

效果图

目录

tools.js

时间工具包

function getTime(){
  var weeks = ["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
  var date = new Date();
  var year = date.getFullYear();
  var month = date.getMonth()+1;
  var da = date.getDate();
  var hour = date.getHours()<10 ? "0"+date.getHours() : date.getHours() ;
  var minute = date.getMinutes()<10 ? "0"+date.getMinutes() : date.getMinutes() ;
  var second = date.getSeconds()<10 ? "0"+date.getSeconds() : date.getSeconds() ;
  var week = date.getDay();
  var time = year+"年"+month+"月"+da+"日 "+hour+":"+minute+":"+second +" "+weeks[week];
  return time;
}

留言板.html

<!DOCTYPE html>
<html>
  <head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <script type="text/javascript" src="tools.js"></script>
    <style>
      #box {
        width: 800px;
        margin: 0 auto;
      }
      textarea {
        width: 800px;
      }
      #li {
        display: block;
        border-bottom: 1px dashed #ebebeb;
        margin: 10px 0;
        padding: 8px 0;
      }
    </style>
  </head>
  <body>
    <div id="box">
      <h3>留言板 </h3>
      发布人：<input type="text" id="person" value="">
      共<input style="border: 0;" name="" id="louceng">
      <textarea name="" id="text" rows="10"></textarea>
      <input type="button" value="确认发布" id="btn" />
      <h3>全部留言</h3>
      <hr/>
    </div>
    <script>
      var num = 0;
      var num1 = 0;
      var box = document.getElementById("box");
      var text = document.getElementById("text");
      var btn = document.getElementById("btn");
      var person = document.getElementById("person");
      var ul = document.createElement("ul");
      ul.id = "ul1";
      var time = document.createElement("div");
      document.getElementById("louceng").value=num+"楼";
      btn.onclick = function() {
        //非空判断
        if(person.value==""||person.value==null){
          alert("发布人不允许为空！");
          return false;
        }
        if(text.value==""||text.value==null){
          alert("内容不允许为空！");
          return false;
        }
        //获取时间
        num = num+1;
        var datetime = getTime();
        time = document.createTextNode("发布时间：" + datetime);
        var li = document.createElement("li");
        li.id = "li";
        //创建删除功能
        var oA = document.createElement("a");
        var oAtext = document.createTextNode("删除");
        oA.href = "#";
        oA.appendChild(oAtext);
        //创建发布文本框
        var fabu = document.createElement("textarea");
        fabu.rows = "10";
        fabu.style = "margin: 0px; width: 760px; height: 138px;";
        fabu.value = text.value;
        fabu.disabled="disabled";
        //创建编辑功能
        var oB = document.createElement("a");
        var oBtext = document.createTextNode("编辑");
        oB.href = "#";
        oB.appendChild(oBtext);
        //创建确认按钮
        var butt = document.createElement("input");
        butt.type = "button";
        butt.value = "确认";
        butt.style.display = "none";
        //解决兼容问题
        var ali = ul.getElementsByTagName("li");
        if(ali.length == 0) {
          ul.appendChild(li);
        } else {
          ul.insertBefore(li, ali[0]);
        }
        //添加节点
        box.appendChild(ul);
        var lou = document.createTextNode("第"+num+"楼");
        var persons = document.createTextNode("发布人："+ person.value);
        document.getElementById("person").value="";
        var textnode = document.createTextNode("发布内容：");
        document.getElementById("text").value="";
        li.appendChild(lou);
        li.appendChild(document.createElement("br"));
        li.appendChild(persons);
        li.appendChild(document.createElement("br"));
        li.appendChild(textnode);
        li.appendChild(document.createElement("br"));
        li.appendChild(fabu);
        li.appendChild(time);
        li.appendChild(oA);
        li.appendChild(oB);
        li.appendChild(butt);
        //删除
        oA.onclick = function() {
          ul.removeChild(this.parentNode);
          //删除时更新
          num1++;//删除次数
          document.getElementById("louceng").value=num-num1+"楼";
        };
        //编辑
        oB.onclick = function() {
          fabu.disabled = "";
          butt.style.display = "block";
        }
        //确认更改
        butt.onclick = function() {
          fabu.disabled="disabled";
          butt.style.display = "none";
        }
        //楼层展示
        document.getElementById("louceng").value=num-num1+"楼";
      }
    </script>
  </body>
</html>

总结

以上所述是小编给大家介绍的JS实现留言板功能[楼层效果展示]，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对我们网站的支持！