在H5中如何使用details元素和summary元素
标记配合使用。在默认情况下，不显示
标记配合使用时，在单击
标记后才会显示
1）open:值为open，功能是定义details是否可见。
2）subject:值为sub_id，功能是设置元素所对应项目的ID号。
3）draggable:值为true或false，功能是设置是否为可拖动元素，默认值是false。
元素是
使用示例代码：
<!doctype html> <html> <head> <meta charset="utf-8"> <title>无标题文档</title> </head> <body> <details open="open"> <summary>页面说明</summary> 今天是2016年7月20号 </details> </body> </html>
效果：
点击小三角形之后，文字隐藏：
是不是特别方便？但是，目前只有Chrome和Safari浏览器支持
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