如何在闭包内访问变量

Question

可以帮助读取闭包内的变量。我知道通过使用return语句的函数我可以得到值。

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

getCounter(); produces 10

有没有办法在没有返回功能的情况下访问或读取变量？

Answer 1

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

console.log(counter);

或

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

    console.log(counter);

jsfiddle

Answer 2

我不知道为什么你需要一个闭包，

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

你也可以尝试这个，

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