const promise1 = new Promise(function(resolve,reject) {
setTimeout(function() {
resolve('promise1');
},3000);
});
const promise2 = new Promise(function(resolve,reject) {
setTimeout(function() {
resolve('promise2');
},3000);
});
promise2.then(function(value) {
console.log(value);
promise1.then(function(value) {
console.log(value);
});
});
输出:* 3秒钟后,两者同时显示
promise2 promise1
我期望的是,三秒钟后,将首先显示promise2,然后再过三秒钟,将显示promise1,因为promise1仅应在控制台登录promise2 .then()之后执行。