js简易留言板
Posted myjayce
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Document</title> | |
| <style type="text/css"> | |
| .wrap { | |
| width: 400px; | |
| margin: 30px auto; | |
| } | |
| textarea { | |
| display: block; | |
| width: 100%; | |
| height: 60px; | |
| } | |
| input { | |
| display: block; | |
| width: 60%; | |
| margin: 15px auto; | |
| } | |
| li { | |
| padding: 5px 10px; | |
| position: relative; | |
| word-break: break-all; | |
| } | |
| .red { | |
| color: #000; | |
| background: #f1f1f1; | |
| } | |
| .pink { | |
| color: #000; | |
| background: #ccc; | |
| } | |
| a { | |
| position: absolute; | |
| right: 0; | |
| top: -20px; | |
| background: yellow; | |
| color: #fff; | |
| } | |
| #list { | |
| margin: 0; | |
| padding: 0; | |
| list-style: none; | |
| font: 14px/26px "宋体"; | |
| } | |
| .clos { | |
| position: absolute; | |
| top: 0; | |
| right: -50px; | |
| width: 50px; | |
| color: #fff; | |
| background: #000; | |
| padding: 5px 0; | |
| text-decoration: none; | |
| text-align: center; | |
| } | |
| .clos:hover { | |
| } | |
| </style> | |
| <script type="text/javascript"> | |
| window.onload = function(){ | |
| var btn = document.querySelector(‘input‘); | |
| var text = document.querySelector(‘textarea‘); | |
| var list = document.querySelector(‘#list‘); | |
| var colors = ["red","pink"]; | |
| var nub = 0; | |
| btn.onclick = function(){ | |
| if(text.value.trim() == ""){ | |
| alert("输入内容不能为空"); | |
| return false; | |
| } | |
| var li = document.createElement("li"); | |
| li.innerHTML = text.value; | |
| // li.className = colors[nub%colors.length]; | |
| /* 判断a标签已经被添加，就让a标签显示出来，否则就添加 */ | |
| if(list.children[0]&&list.children[0].className=="red"){ | |
| li.className = "pink"; | |
| } else { | |
| li.className = "red"; | |
| } | |
| var a = null; | |
| li.onmouseover = function(){ | |
| if(a) { | |
| a.style.display = "block"; | |
| } else { | |
| a = document.createElement("a"); | |
| a.href = "javascript:;"; | |
| a.className = "clos"; | |
| a.innerHTML = "删除"; | |
| a.onclick = function (){ | |
| list.removeChild(this.parentNode); | |
| }; | |
| this.appendChild(a); | |
| } | |
| }; | |
| li.onmouseout = function(){ | |
| a.style.display = "none"; | |
| }; | |
| list.insertBefore(li,list.children[0]); | |
| text.value = ""; | |
| nub++; | |
| }; | |
| }; | |
| </script> | |
| </head> | |
| <body> | |
| <div> | |
| <div class="wrap"> | |
| <textarea id="text"></textarea> | |
| <input type="button" value="留言"> | |
| <ul id="list"></ul> | |
| </div> | |
| </body> | |
| </html> | |
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