...，但是每次计时结束后播放时的音效只是一次性的，请问如何实现在没有点击停止按钮的情况下循环振动、循环播放音效，点击停止按钮后停止振动、停止音效播放。

我使用了自定义对话框拓展，实现了当点击页面图片时，弹出图片，但是图片不能自由缩放，不可以随意放大查看，请问如何实现图片弹出后的自由缩放功能。

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... MySQL manual says: When reading data with LOAD DATA INFILE, empty or missing columns are updated with ''. If you want a NULL value in a column, you should use \N in the data file. The literal word “NULL” ma...