javascript 执行机制

原创于 2019-06-09 22:50:00 发布 · 135 阅读

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本文深入探讨了JavaScript事件循环机制，详细解释了同步代码、setTimeout、process.nextTick和Promise在执行顺序中的作用，帮助读者理解JavaScript异步编程的核心原理。

事件循环Event Loop
https://segmentfault.com/a/1190000013102056
https://www.cnblogs.com/intangible/p/8066979.html

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')
    })
})
//1 7,6,8,2,4,3,5,9,11,10,12