之前在公司做项目的时候，有这么一个需求，要我写一个评论框，可以随着评论的行数增加而自动扩大，最开始我想用textarea实现，但是后来尝试后发现textarea并不适合，textarea的高度不会随着输入行数的增多而增大，于是我上网寻求了下帮助，发现大神张鑫旭的这篇文章《div模拟textarea文本域轻松实现高度自适应》,成功解决我的问题
代码如下：
1 1 <!DOCTYPE html> 2 2 <html lang="en"> 3 3 <head> 4 4 <meta charset="UTF-8"> 5 5 <title>div模拟textarea自适应高度le> 6 6 <style type="text/css"> 7 7 .test_box{ 8 8 width:500px; 9 9 min-height:200px;10 10 max-height:600px;11 11 _height:200px;/*兼容IE6浏览器*/12 12 margin:0 auto;13 13 padding:3px;14 14 outline:0;15 15 border:1px solid #e4e4e4;16 16 font-size:12px;17 17 word-wrap:break-word;/*用于英文文本自动换行，所有主流浏览器支持*/18 18 overflow-x:hidden;19 19 overflow-y:auto;20 20 -webkit-user-modify: read-write-plaintext-only;21 21 }22 22 </style>23 23 </head>24 24 <body>25 25 <div class="test_box" contenteditable="true">我是模拟textarea的div</div>26 26 <script type="text/javascript">27 27 if (typeof document.webkitHidden == "undefined") {28 28 // 非chrome浏览器阻止粘贴29 29 box.onpaste = function() {30 30 return false;31 31 }32 32 }33 33 </script>34 34 </body>35 35 </html> 其中有一两个从没见过的属性：
| 内容只读。 |
| 内容可读写。 |
| 内容可读写，但粘贴内容中的富文本格式（如文本的颜色、大小，图片等）会丢失。内容类似于以纯文本显示。 |
| 规定可以编辑元素内容。 |
| 规定无法编辑元素内容。 |
再次感谢鑫大神（http://www.zhangxinxu.com/），分享了好多非常实用的经验，等将来能达到他那种高度，我也想写出好博客分享出来造福人类，哈哈，虽然还很遥远，继续fighting~
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