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webapp通用选择器
滚动监听，根据滚动条的位置自动更新对应的导航目标
基于窗体滚动的下拉释放加载或者刷新
CSS3 Media Queries Shim
jQuery对话弹窗
判断鼠标进入的方向，js判断划入方向
WebSocket protocol 是HTML5一种新的协议。它实现了浏览器与服务器全双工通信(full-duplex)。
上传图片本地预览
Front-end development specification