规则
1、微任务，包括：setTimeout，setInterval、setImmediate
2、宏任务，包括：原生Promise、process.nextTick
3、执行规则
3.1 执行同步任务
3.2 执行微任务队列
3.3 执行宏任务队列
示例
1、题目
console.log('1');
setTimeout(function() {
console.log('2');
process.nextTick(function() {
console.log('3');
})
new Promise(function(resolve) {
console.log('4');
resolve();
}).then(function() {
console.log('5')
})
})
process.nextTick(function() {
console.log('6');
})
new Promise(function(resolve) {
console.log('7');
resolve();
}).then(function() {
console.log('8')
})
setTimeout(function() {
console.log('9');
process.nextTick(function() {
console.log('10');
})
new Promise(function(resolve) {
console.log('11');
resolve();
}).then(function() {
console.log('12')
})
})
2、答案
待补充
