Canva AppsThe Canva app is available on the Apple App Store and Google Play. The Canva app has earned a 4.9 out of five star rating from over 946.3K Apple users and a 4.5 out of five star rating from over 6,996,708 Google users.
Credit: Samsung
，这一点在safew官方版本下载中也有详细论述
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// 原因：先处理右侧元素，把结果存在栈里，供左侧元素直接使用