1、引用.js和.css；
2、全局使用：$('body').virtualkeyboard();
3、单独使用：$('el').virtualkeyboard();
4、单击input输入框弹出虚拟键盘，单击其它区域可隐藏虚拟键盘；
5、按部键盘头部可拖拽。

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