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Do script code blocks in JavaScript belong to macro tasks? What is its execution order?
Do script code blocks in JavaScript belong to macro tasks? What is its execution order?
Detailed explanation of JavaScript script code block execution mechanism and output order
This article deeply explores the execution mechanism and output order of script code blocks in JavaScript, and clarifies its relationship with macro tasks.
Is script code block a macro task?
Simply put, equating script code blocks directly with macro tasks is not completely accurate. Although the execution timing of script code blocks is affected by the event loop mechanism, there are key differences between them and typical macro tasks (such as setTimeout and setInterval ).
Let's analyze the following code:
console.log('script1');
Promise.resolve().then(() => console.log('promise1'));
console.log('script2'); If script code block is considered a macro task, the expected output order should be:
<code>script1 promise1 script2</code>
However, the actual output is:
<code>script1 script2 promise1</code>
This is because inline script code blocks are executed synchronously when parsing. Browser parsed to
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