在函數外如何調用此函數？

Question

function firstFunction()
{
  stringWord = "Hello World";
  function secondFunction()//How to call this function in thirdfunction() ??
  {
    alert(stringWord);
  }
} 

function thirdFunction()
{
  run = setTimeout( ... , 5000);
}

嗨，我為此放棄。 有人可以幫助我或有其他方式調用該函數嗎？

Answer 1

嘗試這個：

 function firstFunction()
        {
          stringWord = "Hello World";
          this.secondFunction = function()//How to call this function in thirdfunction() ??
          {
            alert(stringWord);
          }
        }
        var instand = new firstFunction();
        function thirdFunction(){
            run = setTimeout( 'instand.secondFunction()', 5000);
        }

希望能有所幫助。

Answer 2

function firstFunction()
{
  stringWord = "Hello World";
  return function secondFunction()//How to call this function in thirdfunction() ??
  {
    alert(stringWord);
  };
}

secondFunction = firstFunction(); 

function thirdFunction()
{
  run = setTimeout( 'secondFunction()' , 5000);
}

JSFiddle： http : //jsfiddle.net/DRfzc/

Answer 3

有沒有辦法來調用secondFunction()從外面firstFunction()而無需修改firstFunction() 如果可以接受，請繼續閱讀...

方法1：修改firstFunction()以返回對secondFunction()的引用：

function firstFunction() {
  stringWord = "Hello World";
  return function secondFunction() {
    alert(stringWord);
  }
}
// And then call `firstFunction()` in order to use the function it returns:
function thirdFunction() {
  run = setTimeout(firstFunction(), 5000);
}
// OR
var secondFunc = firstFunction();
function thirdFunction() {
  run = setTimeout(secondFunc, 5000);
}   

方法2：擁有firstFunction()付諸參考secondFunction()在其范圍以外的變量訪問：

var secondFunc;
function firstFunction() {
  stringWord = "Hello World";
  function secondFunction() {
    alert(stringWord);
  }
  window.secondFunc = secondFunction;  // to make a global reference, AND/OR
  secondFunc = secondFunc; // to update a variable declared in same scope
                           // as firstFunction()
}
firstFunction();
function thirdFunction() {
  run = setTimeout(secondFunc, 5000);
}

請注意，無論使用哪種方法，您都必須在嘗試使用內部函數之前實際調用 firstFunction() 。

Answer 4

var stringWord;
function firstFunction()
{
  stringWord = "Hello World";
  secondFunction();
} 

 function secondFunction()
  {
    alert(stringWord);
  }

function thirdFunction()
{
  run = setTimeout( 'secondFunction()' , 5000);
}