VueJS Vuex-在状态更改时解决的承诺?

你可以 vm.$watch wrap that with a promise .

function watch(vm, fn) {
  return new Promise(resolve => {
    const watcher = vm.$watch(fn, (newVal) => {
      resolve(newVal);
      watcher(); // cleanup;
    });
  });
}

let change = await watch(vm, () => state.foo); // will resolve when state.foo changes

内部 async function

注意:一般来说,这不是一个很好的模式,在大多数情况下,使用 computed property

subscribe

new Promise(resolve => {
      let unsubscribeFn = this.$store.subscribe(mutation => {
        if (mutation.type === "MY_MUTATION") {
          unsubscribeFn();
          resolve();
        }
      });
    });