如何在閉包內部訪問變量

Question

可以幫助讀取封閉中的變量。 我知道通過具有帶有return語句的函數，我可以獲得值。

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

getCounter(); produces 10

沒有返回函數，有沒有辦法訪問或讀取變量？

Answer 1

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

console.log(counter);

要么

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

    console.log(counter);

jsfiddle

Answer 2

我不知道為什么你需要在這里關閉

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

您也可以嘗試一下

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