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  • html留言功能

    <!DOCTYPE html>
    <html lang="zh">
    <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <meta http-equiv="X-UA-Compatible" content="ie=edge" />
        <title>Document</title>
        <style>
            *{margin: 0;padding: 0;}
            .div{width: 500px; min-height: 300px; border: 1px solid red; margin: auto; margin-top: 200px;}
            .div .lyb{width: 90%; margin: auto; display: block; border-bottom: 1px solid red; padding: 5px 0px;}
            .div .div1{width: 90%; border: 1px solid red; margin: 5px auto;}
            .div .div1 p{width: 100%; padding: 5px 0px; height: 30px; line-height: 30px; }
            .div .div1 ul{width: 100%;}
            .div .div1 ul li{width: 100%; height: 30px; padding: 5px 0px; line-height: 30px; list-style: none;margin-bottom: 10px; background: blanchedalmond;}
            #wbk{resize: none; width: 90%;margin: auto; height: 100px; display: block;}
            #btn{width: 90%; height: 100px; margin: auto; display: block; margin-top: 5px;}
            a{float: right}
            span{float: right;}
        </style>
    </head>
    <body>
        <div class="div">
            <p class="lyb">留言板</p>
            <div class="div1">
                <p class="p">请输入内容</p>
                <ul>
                    
                </ul>
            </div>
            <textarea id="wbk"></textarea>
            <input id="btn" type="button" value="发布留言"  />
        </div>
        <script>
            var p = document.getElementsByClassName("p")[0];
            var ul = document.getElementsByTagName("ul")[0];
            var wbk = document.getElementById("wbk");
            var btn = document.getElementById("btn");
            var num = 0;
            btn.onclick = function(){
                if(wbk.value.length != 0){
                    p.style.display = "none";
                    var li = document.createElement("li");
                    var em = document.createElement('em');
                    var a = document.createElement("a");
                    var span = document.createElement("span");
                    
                    li.innerHTML = wbk.value;
                    li.insertBefore(em,li.firstChild);
                    
                    
                    a.innerHTML = "点击删除";
                    a.setAttribute("href","javascript:void(0)");
                    li.appendChild(a);
                    
                    span.innerHTML = "" + num + "";
                    li.appendChild(span);
                    
                    
                    wbk.value = "";
                    ul.appendChild(li);
                    
                    fn1();
                    fn2();
                }else{
                    alert("请输入内容")
                }
            }
            
            function fn1(){
                var ali = document.getElementsByTagName('li');
                var ee = document.getElementsByTagName('em');
                for(var i=0;i<ali.length;i++){
                    ee[i].innerHTML = i + 1 + ".";
                }
                
                var ss = document.getElementsByTagName('span');
                for(var i=0;i<ali.length;i++){
                    ss[i].innerHTML = "" + (i + 1) + "";
                }
                if(ali.length == 0){
                    p.style.display = "block";
                }
                
            }
            function fn2(){
                var aa = document.getElementsByTagName("a");
                for(var i=0;i<aa.length;i++){
                    aa[i].onclick = function(){
                        this.parentNode.parentNode.removeChild(this.parentNode);
                        fn1();
                    }
                    
                }
            }
            
            
            
            
        </script>
    </body>
    </html>

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  • 原文地址:https://www.cnblogs.com/tk55/p/7521419.html
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