练习题1： ``` console.log('script start'); setTimeout(function() { console.log('setTimeout'); }, 0); Promise.resolve().then(function() { console.log('promise1'); }).then(function() { console.log('promise2'); }); console.log('script end'); ``` 练习题2： ``` console.log('script start'); setTimeout(function() { console.log('timeout1'); }, 10); new Promise(resolve => { console.log('promise1'); resolve(); setTimeout(() => console.log('timeout2'), 10); }).then(function() { console.log('then1') }) console.log('script end'); ```