如何在闭包内部访问变量

Question

可以帮助读取封闭中的变量。 我知道通过具有带有return语句的函数，我可以获得值。

var getCounter = (function () {
    var counter = 10;
    return function () {return counter;}
})();

getCounter(); produces 10

没有返回函数，有没有办法访问或读取变量？

Answer 1

var getCounter = (function () {
    this.counter = 10;
})();

console.log(counter);

要么

var getCounter = (function () {
        counter = 10;
    })();

    console.log(counter);

jsfiddle

Answer 2

我不知道为什么你需要在这里关闭

var getCounter = (function () {
  counter = 10;
  return counter;
})();
// As you wrote a closure it is self executed so getCounter variable has the counter value; 
var x = getCounter; 

Answer 3

您也可以尝试一下

 var counter; var getCounter = (function() { counter = 10; })();