JS中Promise 的使用

class A:

     public static testFunc(): (() => Promise< boolean>)[]

    {

         cc. log( "进入第一层Promise")

         let tempLoadTemplates = [

            [ "First Func",   function() {     cc. log( "this is function 1");} ],

            [ "Second Func", function() {     cc. log( "this is function 2");}  ],

            [ "Thrid Func",   function() {     cc. log( "this is function 3");}  ],

            [ "Fouth Func",   function() {     cc. log( "this is function 4");}  ],

        ];

         let testPrmise : (() => Promise< boolean>)[] = [];

         for ( var i = 0; i != 4; i++)

        {

             cc. log( "I 的值为 : " + i);

             const TempTable = tempLoadTemplates[ i];

             const name      = TempTable[ 0];

             const fuc       = TempTable[ 1];

             const ci        = i;

             testPrmise. push(() => {

                 return new Promise< boolean>( async ( completed, failed) => {

                     cc. log( "这是第一层Pormis ====>" + "Step : " + ci); //==>输出正常

                     cc. log( "这是第一层Pormis ====>" + "Step : " + i); //==>输出 4

                     //结论 对于Promise中的闭包参数传值 必须用const 修饰符 否则将被赋值为最后一次设定的值

                     //这边就可以在这里让TestFunction做相应的操作

                     //比如读取数据 等等

                     await this. TestFunction( name, fuc);

                     if ( i % 2 == 0)

                         completed( true);

                     else failed( "Do Failed");

                })

            });

        }

         cc. log( "压入完毕！");

         cc. log( testPrmise);

         return testPrmise;

    }

     private static TestFunction( name, functionAddr)

    {

         cc. log( name);

         functionAddr();

    }

class B: