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函数内部引用类型的变量被外部使用,函数是否会释放?

  1. 函数内的变量赋值给外部
var global1
(function() {
    var a = {}
    var b = [1]
    global1 = b
})()
  1. 函数内部的变量返回给外部
var global2
global2 = (function() {
    var a = {}
    var b = [2]
    return b
})()

上述2个例子中的函数是否会释放,函数内部的a b 是否会释放?

另外,是否可以利用Chrome工具查看函数是否会释放?

谢谢大神们~


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
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1 Answer

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by (71.8m points)

chrome可以查看调用栈作用域对象:
image.png

变量ab都是函数内的局部变量,保存在栈内的(变量引用指向的值{}[2]保持在堆内的),函数执行完后变量本身就释放了。但是堆中的数据[2]由于被全局变量global1引用着 不会被回收


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
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