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。
