Examples of using Scope chain in English and their translations into Vietnamese
{-}
-
Colloquial
-
Ecclesiastic
-
Computer
Create the Scope Chain.
Let's call this sequence of scope objects as a scope chain.
The last element in the scope chain is always the Global Object.
Scope chains establish the scope for a given function.
When some function is invoked, scope chain consists of more than one object.
Like it or not, this is not saved as a part of the scope chain at all.
Learn the details of Scope, Scope Chains, Closures, and Garbage Collection.
When this function accesses variable value,JavaScript immediately locates it on the first object in the scope chain.
This is because this is never a part of the scope chain, and you should be aware of it.
The front of the scope chain is the variable object of the context whose code is executing.
Identifiers are resolved by navigating the scope chain in search of the identifier name.
The scope chain provides ordered access to all variables and functions that an execution context has access to.
But if you try to access non-existing property on the scope chain(i.e. access non-existing variable), then ReferenceError occurs.
Multiple functions are created in the loop,and all of them have reference to the same scope object in their scope chains.
In top-level JavaScript code, scope chain contains just a single element: the Global Object.
With an assignment, without the var statement,if the referenced identifier is not found in the scope chain, it will become a deleteable property of the global object.
What we have now is a scope chain: if we try to access some variable inside myFunc, JavaScript will try to find it on the first scope object: myFunc() scope. .
When, however, the function accesses counter,JavaScript fails to find it on the first object in the scope chain, moves to the next scope object, and locates it there.
The behavior of resolving a variable on scope chain is very similar to that of prototypal inheritance, with, again, one notable difference: if you try to access some non-existing property of regular object, and prototype chain doesn't contain this property either, it's not an error: undefined is silently returned.
So, when get() accesses counter variable,JavaScript fails to find it on the first object in the scope chain, moves to the next scope object, and uses counter variable on createCounter(100) scope. .
You might expect that if function is called from top-level code,then scope chain is guaranteed to contain exactly 2 scope objects, but this is not necessarily true!
The first scope object in the chain for function get() is the empty object get() scope.
During the 13th Five-Year Plan period, it is expected that some enterprises will, through expansion or acquisition,extend their industry chain and broaden their business scope to become integrated environmental services providers.
Founded in 1988, Wanda Group focuses on the business scope of commercial real estate, high-grade hotel, culture activity and chain department store.
The exhibition by the only national industry organization in the field of national chain Supported by China chain operation association,the exhibition scope of enterprises includes catering, retail, service three industries and service providers, industry institutions, etc., which is an industry-wide exhibition.
Both upstream and downstream segments continue to exert pressure on the middle market,resulting in further consolidation and integration in the middle of the value chain as players seek to maximize margins through scale and scope.
The BA in Marketing provides students with a firm base in the core conceptual fields, including market dynamics and consumer behavior theories,marketing strategy scope, and specific operation fields such as communication and branding efforts and distribution/value chain/demand management.-.
The academy report proposes broadening the scope of surveillance from a“first island chain” linking Okinawa, Taiwan and the Philippines and one of China's defence lines in the open ocean to a“second island chain” linking the Izu Island chain, Guam and New Guinea.
Online postgraduate education is growing rapidly and80 percent of the growth in this sector is privately owned, but the scope of this article covers networks and chains only.