This link has been bookmarked by 83 people . It was first bookmarked on 02 Mar 2006, by Sérgio Carvalho.
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A closure
is formed when one of those inner functions is made accessible outside
of the function in which it was contained, so that it may be executed
after the outer function has returned. At which point it still has
access to the local variables, parameters and inner function
declarations of its outer function
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Mr. DiGiA "closure" is an expression (typically a function) that can have free variables together with an environment that binds those variables (that "closes" the expression).
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Closures are one of the most powerful features of ECMAScript
(javascript) but they cannot be property exploited without
understanding them -
Function objects created with the
Functionconstructor
always have a[[scope]]property referring to a scope
chain that only contains the global object.
Function objects created with function declarations or function
expressions have the scope chain of the execution context in which
they are created assigned to their internal[[scope]]
property.
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The simple explanation of a Closure is that ECMAScript allows inner
functions; function definitions and function expressions that are
inside the function bodes of other functions. And that those inner
functions are allowed access to all of the local variables, parameters
and declared inner functions within their outer function(s).
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cloud chen理解JS闭包，就看这个
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rchk !Javascript Closures
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Benx Shen/* Assign the constructor's parameter to a property of the object:- */
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- Closure
- A "closure" is an expression (typically a function) that
can have free variables together with an environment that binds
those variables (that "closes" the expression). -
Example 2: Associating Functions with Object Instance Methods
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Mike KossGood (if rather lengthy) explanation of JavaScript closures - and the problems and inefficiencies they can cause. Quoted: Accidentally creating closures can have harmful side effects as the following section on the IE memory leak problem describes, but
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jcartledgeThe Internet Explorer Memory Leak Problem
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