Of course you'll want to do some additional checking, just to make sure that the index truly isn't needed.
当然,您可能想要做一些附加检查,只是为了确保该索引确实不再需要。
Some applications do their own checking to ensure that relationships between tables are valid; that is, they might read a parent row to make sure it exists, before inserting a child row.
有些应用程序本身也会做一些检查,以确保表之间的关系是有效的。
Once again, you do some browser capability detection, by first checking if the window object has the localStorage property, per the HTML 5 specification.
同样,这里做了一些浏览器功能检查,按照 HTML 5 规范,首先检查 window 对象是否有 localStorage 属性。
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