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JS闭包的理解

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Release： 2016-06-06 19:38:46
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先从闭包特点解释,应该更好理解. 闭包的两个特点： 1、作为一个函数变量的一个引用–当函数返回时，其处于激活状态。 2、一个闭包就是当一个函数返回时，一个没有释放资源的栈区。 其实上面两点可以合成一点,就是闭包函数返回时,该函数内部变量处于激活状态,

先从闭包特点解释,应该更好理解.

闭包的两个特点：

1、作为一个函数变量的一个引用 – 当函数返回时，其处于激活状态。
2、一个闭包就是当一个函数返回时，一个没有释放资源的栈区。

其实上面两点可以合成一点,就是闭包函数返回时,该函数内部变量处于激活状态,函数所在栈区依然保留.


原文地址：笨鸟先飞技术分享网站http://www.sucker-fly.com/archives/519 
function a(){ 
var i=0; 
function b(){ 
alert(++i); 
} 
return b; 
} 
var c = a(); 
c();
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