ES6中的Promise.resolve()的作用

var foo = {
    then: (resolve, reject) => resolve('foo')
};
var resolved = Promise.resolve(foo);
相当于
var resolved = new Promise((resolve, reject) => {
    foo.then(resolve, reject)
});

resolved.then((str) => 
    console.log(str);//foo
)

　　

原文地址：https://segmentfault.com/q/1010000005330351