JavaScript Event Loop机制详解与Vue.js中nextTick的实践应用

contains only platform code. [3.1].

Here “platform code” means engine, environment, and promise implementation code. In practice, this requirement ensures that onFulfilled and onRejected execute asynchronously, after the event loop turn in which then is called, and with a fresh stack. This can be implemented with either a “macro-task” mechanism such as setTimeout or setImmediate, or with a “micro-task” mechanism such as MutationObserver or process.nextTick. Since the promise implementation is considered platform code, it may itself contain a task-scheduling queue or “trampoline” in which the handlers are called.

规范请求，onFulfilled 必须在履行高低文┞坊(Execution Context Stack) 只包含平台代码(platform code) 后才能履行。平台代码指引擎，情况，Promise 实现代码等。实践上来说，这个请求包管了>

// 测试代码

console.log('main1');

// 该函数仅在 Node.js 情况下可以应用

process.nextTick(function() {

console.log('process.nextTick1');

});

setTimeout(function() {

console.log('setTimeout');

process.nextTick(function() {

console.log('process.nextTick2');

});

}, 0);

new Promise(function(resolve, reject) {

console.log('promise');

resolve();

}).then(function() {

console.log('promise then');

});

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