When i set the value to true under the object canPurchase the add to cart button should show. for some reason i can only get it to show when i set ng-show with an exclamation in front of it. i am still new to angular so i dont know the terminology very well.When i set the value to true under the object c
阅读背景：
按钮应显示何时值设置为true但不是
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