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Glory to Heroes.

💢 Interview Questions: Event loop mechanism

#js #interview #eventLoop

Question: Give an explanatory note on the event loop mechanism.

answer:

The event loop mechanism mainly has the following processes:

🍉Synchronous tasks are executed on the main thread, forming an execution context stack.

🍓Once all synchronous tasks in the execution stack have been executed, the system will read the asynchronous tasks in the queue, such as Promise.then(), setTimeout, AJAX callbacks, etc.

🍆The asynchronous task will be added to the task queue

🥑Once the execution stack is cleared, the system checks the task queue. If it is not empty, the first task is taken out and placed on the execution stack for execution.

🥦The main thread repeats the process of alternating execution of the stack and queue, thereby realizing queued execution of threads.
The event loop allows synchronous tasks and asynchronous tasks to be executed alternately in the same thread, making full use of CPU resources. This is important for JavaScript that supports UI interaction and responsiveness.

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🚳 Interview Questions: Ajax implementation

#js #interview #ajax

Implement an ajax request function that supports Promise:

🍣Send a request using the XMLHttpRequest object

🍛Initialize the open method, configure the request method and url

🍷Add onload and onerror callback functions

🧉onload determines whether the status code is within the range of 200–300 resolve, otherwise reject

🫘onerror directly reject

🥧After the request is successful, resolve returns response, and after failure, reject reports an error.

🥟Support options to configure request parameters and request body

🍱Returns a Promise object, which can be processed externally using then/catch

Analysis: Promise is used to encapsulate asynchronous ajax requests and achieve a synchronous programming style.

🚳 Interview Questions: JSONP cross-domain implementation

#js #interview #jsonp

Analysis: Create the script node script.src, set the callback function callbackName, parse the parameters and splice the URL, dynamically insert it into the body to implement JSONP cross-domain request, and return the Promise interface.

📵 Interview Questions: Implement deep cloning

#js #interview #deepClone

Analysis: Recursively implement deep cloning of objects and arrays, returning basic types directly, and reference types recursively call deep cloning hierarchically.

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🚱 Interview Questions: Function currying

#js #interview #deepClone #patterns

Analysis: Currying of the add function is achieved by recursively calling a function that continues to accept parameters.