Javascript調用子函數並從函數內部獲取返回

Question

在很長的功能中，我需要先獲得用戶選項，然后才能繼續執行腳本。

這個想法是用這樣的東西來獲得選擇的值（'a'或'b'）：

function myMainFct {

  // a lot of lines here

    if(a_Defined_Value_Is_Ok) { var option="a"; }

    else {
      var choose = "<a onclick=\"myOption('a')\">A</a><a onclick=\"myOption('b')\">B</a>";
      // here I put the <a> choices in a div

        // now the subfunction
        function myOption(x) { return x; }

        // what will happen when I'll get the value
        if (x)  { var option=x; }
    }

    if (option=="a") {
      // let's continue the script for users with "a" option
    }

    else if (option=="b") {
      // let's continue the script for those with "b" option
    }

    // end of common main function
} 

Answer 1

與您的語法保持一致：

var x = (function myOption(x) { return x; })();

Answer 2

您需要將選項處理代碼放在單獨的函數中。

function myMainFct {

  //  a lot of lines here

  if(a_Defined_Value_IsOk) 
    myCompletion("a");

  else {
    var choose = "<a onclick=\"myCompletion('a')\">A</a><a onclick=\"myCompletion('b')\">B</a>";
    // here I put the <a> choices in a div

  }
  // end of common main function
}

function myCompletion(option) {

  if (option=="a") { 
    // let's continue the script for users with "a" option
  }

  else if (option=="b") {
    // let's continue the script for those with "b" option
  }

} 

Answer 3

我終於找到了另一個解決方案。 它不是最好的，但是可以。

function myOption(x) { myMainFct(x); } // return to main function when called

function myMainFct(x) {

  // a lot of lines here

  if(a_Defined_Value_Is_Ok) { var option="a"; }

  else {
    var choose = "<a onclick=\"myOption('a')\">A</a><a onclick=\"myOption('b')\">B</a>";
    // here I put the <a> choices in a div

    if (x)  { var option=x; }
  }

  if (option=="a") {
    // let's continue the script for users with "a" option
  }

  else if (option=="b") {
    // let's continue the script for those with "b" option
  }

  // end of common main function
}