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    el-table分页数据+回显+勾选状态+记录数据(map实战)

    原以为js中即便是学到了map可实际上也不会用到map,可我今天就遇到一个el-table分页查询,然后需要勾选表格内容,切换页码后回显勾选项的需求。 一开始想的是,把所有已勾选的数据用list来维护,可稍微一思索就发现这样实际执行起来还是有缺陷的,比如用于来回切换页码等场景稍微一复杂就容易乱套。还是应该记录每一条数据的信息,用户点击勾选的时候,用当前的勾选情况去跟已勾选的数据做一个比对。如果已记录的数据里存在当前列表中的勾选项,同时本次属于勾选状态,则不做处理。如果处于未勾选状态,则从用于记录的总数据中删除该选项。如果总得记录结果没有改数据,同时该数据本次是勾选状态,则把新数据添加进去。 用map是最好的了,于是就实战一下,试试手~

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    React极简教程: Hello,World!React简史React安装Hello,World

    A programming paradigm is a fundamental style of computer programming. There are four main paradigms: imperative, declarative, functional (which is considered a subset of the declarative paradigm) and object-oriented. Declarative programming : is a programming paradigm that expresses the logic of a computation(What do) without describing its control flow(How do). Some well-known examples of declarative domain specific languages (DSLs) include CSS, regular expressions, and a subset of SQL (SELECT queries, for example) Many markup languages such as HTML, MXML, XAML, XSLT… are often declarative. The declarative programming try to blur the distinction between a program as a set of instructions and a program as an assertion about the desired answer. Imperative programming : is a programming paradigm that describes computation in terms of statements that change a program state. The declarative programs can be dually viewed as programming commands or mathematical assertions. Functional programming : is a programming paradigm that treats computation as the evaluation of mathematical functions and avoids state and mutable data. It emphasizes the application of functions, in contrast to the imperative programming style, which emphasizes changes in state. In a pure functional language, such as Haskell, all functions are without side effects, and state changes are only represented as functions that transform the state. ( 出处:维基百科)

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