执行过程:
每当执行栈为空时,就检查微任务,有则进栈执行,栈空了再去查微任务,
直到没有微任务时,去宏任务中取一个进栈执行,栈空了又开始检查微任务,循环往复,直至全都为空
宏任务:
I/O (click事件、fs.writeFile)
setTimeout
setInterval
setImmediate (nodejs)
requestAnimationFrame
微任务
process.nextTick (nodejs)
Promise.then().catch()
-
console.log(1); setTimeout(function () { console.log(2); }, 0) new Promise((resolve, reject) => { reject(true); setTimeout(function () { resolve(false); }, 1000); new Promise((resolve, reject) => { resolve(false); }).then(() => { console.log(6); }, () => { console.log(7); }); }).then(() => { console.log(3); }).catch(() => { console.log(4); }); console.log(5); // 1 5 6 4 2
原文地址:https://www.cnblogs.com/tianxiaxuange/p/10201867.html
时间: 2024-10-07 22:33:24