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; } #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。
