Web Front-endJS TutorialDo script code blocks belong to macro tasks? How does it have to do with macro tasks?
Detailed explanation of the relationship between JavaScript script code block execution mechanism and macro tasks
It is crucial to understand the execution mechanism of script code blocks in JavaScript and their relationship with macro tasks. This article will explore in-depth whether script code blocks belong to macro tasks and explain their execution order.
script code blocks are not macro tasks
Many materials classify script code blocks as macro tasks, but this is not entirely accurate. The execution of script code blocks is synchronous, which is different from the asynchronous execution mechanism of macro tasks. Let's understand it with an example:
console.log('script1');
Promise.resolve().then(() => { console.log('promise1'); });
console.log('script2');
If script code block is a macro task, the expected output order should be:
<code>script1 promise1 script2</code>
However, the actual output order is:
<code>script1 script2 promise1</code>
This is because the browser encounters the HTML when parsing
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