微博发帖框作业
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<title>weibo</title>
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<div style="float: left;font-size:16px;">有什么新鲜事想告诉大家?</div>
<div style="float: right;color:grey;">已输入<span id="num">0</span>字</div>
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<textarea style="width: 580px; height: 80px;font-size: 16px;"></textarea>
<span>※ 表情</span>
<span>※ 图片</span>
<span>※ 视频</span>
<span>※ 话题</span>
<span>※ 头条文章</span>
<input type="submit" name="" style="float:right;font-size:14px;color:#fff;background-color: #ff7f4d;padding:5px 20px;">
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