87,955
社区成员
![](https://csdnimg.cn/release/cmsfe/public/img/topic.427195d5.png)
![](https://csdnimg.cn/release/cmsfe/public/img/me.40a70ab0.png)
![](https://csdnimg.cn/release/cmsfe/public/img/task.87b52881.png)
![](https://csdnimg.cn/release/cmsfe/public/img/share-circle.3e0b7822.png)
setTimeout(function(){
console.log(500+':500')
},500)
setTimeout(function(){
console.log(200+':200')
},200)
var timeout = function(n) {
return new Promise(function( resolve ){
setTimeout(resolve, n);
});
};
timeout(500).then(function(){
console.log(500+':500');
return timeout(200);
}).then(function() {
console.log(200+':200');
});
// 或者
timeout(500).then(function(){
console.log(500+':500');
}).then(function() {
return timeout(200);
}).then(function() {
console.log(200+':200');
});