iOS设备怎么判断是否安装过某个应用，就是以前安装过的，后面又删除了的
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View purchased items in App Store ->Not on this iphone. This is how the iPhone works.
Judge by openurl to see if it can be opened
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
View purchased items in App Store ->Not on this iphone. This is how the iPhone works.
Judge by openurl to see if it can be opened