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目的是在编译前获取到手机型号，然后定义到defineConstants中当做全局变量
@Taro-小助手-honly 内容都是动态生成的，高度是不固定的；如果能设置死高度那就不是问题了……
试用了下taro-plugin-canvas，但是元素的height都要设定死，没办法实现内容撑开图片…… 求推荐好用的插件
