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使用函数
You can use a function to create a tuple
可以使用函数来创建元组:
In such case it is always possible to use a function call, but this can be cumbersome and inelegant.
在这种情形下总是可能使用函数调用,但是这样做会显得很笨重而且不简洁。
Although you can use a string instead of a function in some situations, we suggest that you use a function whenever possible.
尽管有些情形下可以用字符串代替函数,我们还是建议您尽可能使用函数。
For example, you can't compare a date with a string. You have to use a function to convert the string to a date, or vice versa.
例如,您无法将日期与字符串进行比较。您必须使用函数将字符串转换为日期,反之亦然。
Function properties can replace closures sometimes. For instance, we can rewrite the counter function example from the chapter Variable scope to use a function property
Please note that we use a temporary variable tmp to walk over the list. Technically, we could use a function parameter list instead
请注意,我们使用了一个临时变量 tmp 来遍历链表。从技术上讲,我们可以使用函数的入参 list 来代替:
With JavaScript, when you need a function, use a function.
在 JavaScript 中,当需要某一功能时,使用 函数。
So we should use a Function Expression only when a Function Declaration is not fit for the task. We've seen a couple of examples of that in this chapter, and will see more in the future.
Those languages also need to specify when one function type is a subtype of another-that is, when it is safe to use a function of one type in a context that expects a function of a different type.
Those languages also need to specify when one function type is a subtype of another-that is, when it is safe to use a function of one type in a context that expects a function of a different type.
This is actually the exact same problem with data inside Vue components. So the solution is also the same - use a function for declaring module state (supported in 2.3.0+)
实际上这和 Vue 组件内的 data 是同样的问题。因此解决办法也是相同的 - 使用一个函数来声明模块状态(仅 2.3.0+ 支持):
FONT size=2Function permissions include the functions visible in user interface, such as: user management, report management, indicator management, indicator, query and so on. Function permissions determines whether a role owns the right to use a function.
FONT size=2功能权限包括用户界面可见的功能,如:用户管理、报表管理、指标管理、汇总、查询等,功能权限决定了该角色是否拥有功能的使用权。
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