原生JavaScript实现留言板

本文实例为大家分享了JavaScript实现留言板的具体代码，供大家参考，具体内容如下
效果：
代码：
<!DOCTYPE html>
<html>
 <head>
 <meta charset="UTF-8">
 <title></title>
 <style>
 #txt2{
 width:400px;
 height:50px;
 margin-top:5px;
 }
 #span1{
 margin-left:200px;
 }
 #box{
 width:400px;
 /*height:400px;*/
 /*border:1px solid gray;*/
 }
 #box .item{
 height:80px;
 border-bottom:dashed 1px lightgrey
 }
 #box .c1{
 height:30px;
 }
 #box .c1 span{
 float:left;
 }
 #box .c1 a{
 float:right;
 margin-right:20px;
 text-decoration: none;
 color:black;
 }
 
 </style>
 </head>
 <body>
 <div>
 说点什么吗......
 </div>
 <div>
 <input type="text" placeholder="洪七公" id="txt1"/>
 </div>
 <div>
 <textarea name="" id="txt2" maxlength="10"></textarea>
 </div>
 <div id="div3">
 <span id="span1">还能输入<span id="span2">10</span>个字</span>
 <input type="button" value = "发布" id="btn"/>
 </div>
 <div>
 <div>大家在说</div>
 </div>
 <div id="box">
 <div class = "item">
 <div class = "c1">
  <span>乔峰：</span>
  <span>今天............</span>
  <a href = "#">删除</a>
 </div>
 <div>01月04日 01：28</div>
 </div>
 <div class = "item">
 <div class = "c1">
  <span>乔峰：</span>
  <span>今天............</span>
  <a href = "#">删除</a>
 </div>
 <div>01月04日 01：28</div>
 </div>
 </div>
 </body>
 <script type="text/javascript">
 //获取按钮
 var btn = document.getElementById("btn");
 var box = document.getElementById("box");
 var txt1 = document.getElementById("txt1");
 var txt2 = document.getElementById("txt2");
 
 btn.onclick = function () {
 //console.log(this);
 var divItem = document.createElement("div");
 divItem.className = "item";
 //box.appendChild(divItem);//追加节点
 box.insertBefore(divItem, box.firstChild);//插入节点
 
 var div1 = document.createElement("div");
 div1.className = "c1";
 var div2 = document.createElement("div");
 divItem.appendChild(div1);
 divItem.appendChild(div2);
 
 //设置第1个div的内容
 var span1 = document.createElement("span");
 div1.appendChild(span1);
 span1.innerHTML = txt1.value + " : ";
 
 var span2 = document.createElement("span");
 div1.appendChild(span2);
 span2.innerHTML = txt2.value;
 
 var a = document.createElement("a");
 a.href = "#";
 a.innerHTML = "删除";
 div1.appendChild(a);
 //a的删除事件
 a.onclick = function () {
  this.parentNode.parentNode.remove();
 }
 
 var date = new Date();
 //var str = date.toLocaleString();
 var m = date.getMonth() + 1;
 var d = date.getDate();
 var h = date.getHours();
 var m2 = date.getMinutes();
 m = fun1(m);
 d = fun1(d);
 h = fun1(h);
 m2 = fun1(m2);
 
 var str = m + "月" + d + "日 " + h + ":" + m2;
 
 div2.innerHTML = str;
 
 }
 
 //封装一个日期格式化的函数
 function fun1(x) {
 if (x < 10) {
  return "0" + x;
 }
 return x;
 }
 
 var span2 = document.getElementById("span2");
 txt2.onkeyup = function () {
 var str = this.value;
 console.log(str.length);
 span2.innerHTML = 10 - str.length;
 }
 


 </script>
</html>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持自学编程网。
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