本篇文章为大家展示了使用JavaScript怎么实现一个留言板功能，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。
html
<body οnlοad="f3()"> <div class="title"> <h2>留言板</h2> <span id="step">一共有（）楼</span> </div> <div id="contents"> <div class="box" id="box"> <div class="div01">1楼</div> <div class="tit"><img src="img/i1.png"></div> <div class="main"> <div>姓名：</div> <div>内容：</div> </div> <div class="div02"> <div><a href="javascript:void (0)" οnclick="del(this)">删除</a>|<a href="javascript:void (0)" οnclick="praise(this,0)">点赞（）</a> </div> <div>发布时间：</div> </div> </div> </div> <div class="title1"> <h2>发布留言</h2> <span></span> </div> <div class="message"> <div class="nav"> 选择头像： <div id="img"> <img src="img/i1.png"> <img src="img/i2.jpg"> <img src="img/i3.jpg"> </div> <div id="pic1"></div> <div>用户姓名：<input type="text" id="name" οnblur="f1(this)" οnfοcus="f(this,'请输入用户名!')"><span></span></div> <div>留言内容：<textarea id="textarea" οnblur="f1(this)" οnfοcus="f(this,'请输入内容！')"></textarea><span></span></div> <button οnclick="f2()">发布留言</button> </div> </div> </body>
css
*{padding: 0;margin: 0;border: 0;text-decoration: none;} .title{width: 1000px;height: 80px;background: #2b669a;margin: auto; color: #ffffff;} .title h2{line-height: 80px;text-align: center;width: 920px;float: left;} .title span{float: left;width: 80px;line-height: 80px;font-size: 12px;} #contents{ width: 1000px;background:#9acfea;margin: auto;} #contents .box{display:none;height: 150px;border-bottom: 1px dashed #ffffff;} #contents .box .div01{width: 50px;text-align: center;float: left;line-height: 150px;} #contents .box .tit{width: 80px;height: 80px;float: left;margin: 30px;} #contents .box .tit img{width: 80px;height: 80px;} #contents .box .main{width: 100px;height: 100px;float: left;margin-top: 30px;line-height: 40px;} #contents .box .div02{font-size: 12px;width: 240px;height: 100px;float: right;line-height: 40px;margin-top: 30px;} .title1{width: 1000px;height: 80px;background: #2b669a;margin: auto;color: #ffffff;} .title1 span{float: left;width: 80px;line-height: 80px;font-size: 12px;} .title1 h2{line-height: 80px;text-align: center;width: 920px;float: left;} .message{width: 1000px;margin: auto;line-height:30px;background:#9acfea;height: 220px;} .message .nav{width: 400px;margin-left: 400px;} #img img{width:50px;height: 50px;} .border{border: 1px solid crimson;} .red{color:red;} .border{border: 1px solid red;}js
function f(obj,text) { obj.nextSibling.innerHTML=text; obj.nextSibling.style.color="#000"; obj.nextSibling.style.fontSize=12+'px'; } function f1(obj) { obj.nextSibling.innerHTML=" "; } //发布留言 var i = 0; //i 为 box 的 id var j = 0; //j是一共有多少个楼，删除后的用它接收 var q =1; function f2() { var name = document.getElementById("name"); var main = document.getElementById("textarea"); var box = document.getElementById("box"); var contents = document.getElementById("contents"); var step = document.getElementById("step"); var pic1 =document.getElementById("pic1"); if (name.value == "") { name.nextSibling.innerHTML="*必须填写用户名!"; name.nextSibling.style.color="red"; name.nextSibling.style.fontSize=10+'px'; }else if(main.value == ""){ main.nextSibling.innerHTML="必须填写内容"; main.nextSibling.style.color="red"; main.nextSibling.style.fontSize=10+'px'; }else if(q==1){ //选择头像 pic1.innerHTML="必须选中一个头像！"; pic1.style.color="red"; pic1.style.fontSize=10+"px"; }else { //楼层 var div = box.cloneNode(true); div.style.display="block"; i++; j++; div.id="box"+i; var child = div.getElementsByTagName("div"); //获取克隆出来div里面的小div child[0].innerHTML=i+"楼"; child[3].innerHTML="姓名："+name.value; child[4].innerHTML="内容："+main.value; step.innerHTML="一共有（"+ j +"）楼"; child[7].innerHTML="发布时间"+oTime(); contents.appendChild(div); } } //发布时间的时间 function oTime() { var date = new Date(); var year = date.getFullYear(); var month = date.getMonth()+1; var date1 = date.getDate(); var day = date.getDay(); var hour = date.getHours(); var minutes = date.getMinutes(); var second = date.getSeconds(); if(day === 0){ day = "日"; }else if(day == 1){ day = "一"; }else if(day == 2){ day = "二"; }else if(day == 3){ day = "三"; }else if(day == 4){ day = "四"; }else if(day == 5){ day = "五"; }else if(day == 6){ day = "六"; } return year+"年"+month+"月"+date1+"日"+hour+"："+minutes+"："+second+"星期"+day; } //删除 function del(obj) { var step = document.getElementById("step"); j--; step.innerHTML="一共有（"+ j +"）楼"; //删除后一共有多少楼 var contents = document.getElementById("contents"); var p =obj.parentNode.parentNode.parentNode; //removeChild(p)表示把p删掉 contents.removeChild(p); } //点赞 function praise(obj,t) { t++; var parent1 = obj.parentNode; parent1.innerHTML='<a href="javascript:void (0)" οnclick="del(this)">删除</a>|' + '<a href="javascript:void (0)" οnclick="praise(this,'+ t +')">点赞（'+ t +'）</a>'; } //选择头像 function f3() { var img = document.getElementById("img"); var pic = img.getElementsByTagName("img"); var box = document.getElementById("box"); var img1= box.getElementsByTagName("img"); for(var a =0; a<pic.length;a++){ pic[a].onclick=function () { for(var b=0;b<pic.length;b++){ pic[b].className=""; } this.className="border"; img1[0].src = this.src; q=2; pic1.innerHTML=""; } } }上述内容就是使用JavaScript怎么实现一个留言板功能，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注亿速云行业资讯频道。
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