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 Arrays are frequently used in development, and processing data in arrays is one of the more common and important operations. Therefore, processing data in arrays during development is an important skill. Every developer Everyone should master the operations of arrays, especially for junior developers who have just entered the industry, so be sure to master the relevant skills. This article mainly shares some operations to filter the data in the array, about the use of the filter() method.

In Vue, a v-for loop is used to get dynamic data, thus creating a dom tree, such as the very common ul>li list. When I need to traverse an array or enumerate an object and display it in a loop, I often use the list rendering instruction v-for. It needs to be used in combination with in or of, as follows. When Vue renders elements, for the sake of efficiency, it will reuse existing elements as much as possible instead of re-rendering. If you don't want this, you can use the key attribute provided by Vue, which allows you to decide whether to reuse elements. Key The value must be unique.