It is different from es6-Promise,when resolve a promise.below is the code and result

[vickygaogao]

below is the code and result

code

    function fn1() {
        console.log("async1 start", 1);
        return new Promise((r) => {
          r(fn2());                                          // resolve a promise
        }).then(() => console.log("async1 end", 4));
      }

      function fn2() {
        console.log("async2", 2);
        return new Promise((r) => {
          r(123);
        });
      }

      setTimeout(() => {
        console.log("timeout", 8);
      }, 0);

      fn1();

      new Promise((r) => {
        console.log("promise", 3);
        r();
      })
        .then((d) => {
          console.log("promise2", 5);
        })
        .then((d) => {
          console.log("promise3", 6);
        })
        .then((d) => {
          console.log("promise4", 7);
        });

es6-Promise result

lie result