比较平滑的js控制textaera的高度

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>佐佐制造 --textarea---addheight</title> <style type="text/css"> /* Reset style */ * { margin:0; padding:0; word-break:break-all; } body { background:#FFF; color:#333; font:12px/1.4em Helvetica, Arial, sans-serif; } h1, h2, h3, h4, h5, h6 { font-size:1em; } a { color:#333; text-decoration:none; }     a:hover { text-decoration:underline; } ul, li { list-style:none; } fieldset, img { border:none; } input, textarea, select, button { font:12px Helvetica, Arial, sans-serif; } .button { padding:0 10px; height: 22px; border: 1px solid; border-color: #EEE #999 #999 #EEE; background: #DDD; color: #333; line-height: 20px; cursor: pointer; margin-left:2px; } .submit { padding:0 10px; height: 22px; border: 1px solid; border-color: #DDD #CC8305 #CC8305 #DDD; background: #FFA200; color: #FFF; line-height: 20px; letter-spacing: 1px; cursor: pointer; } /* edit style */ #edit { width:300px; margin:50px; }     .edit_caption { width:100%; overflow:hidden; margin-bottom:1px; overflow:hidden; }     .edit_caption span { display:block; float:left; margin:0 1px; padding:4px 10px; background:#DDD; cursor:pointer; }     .edit_caption span:hover { background:#EEE; }     #edit textarea { width:300px; height:80px; margin:0; padding:0; } </style>  </head> <body>               放大         缩小          <textarea id="comment_content" tabindex="1" rows="8" name="comment_content" style="height:100px"><"runEx('runcode63195')" type="button" value="运行代码" class="fn-butt" /> <INPUT onclick="copy2('runcode63195')" type="button" value="复制代码" class="fn-butt" /> <INPUT onclick="doSave(runcode63195)" type="button" value="保存代码" class="fn-butt" />[Ctrl+A 全选 注:引入外部Js需再刷新一下页面才能执行]</div>

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