Menyahlantun dan pendikit ialah teknik yang digunakan untuk mengoptimumkan prestasi dengan mengawal kekerapan pelaksanaan fungsi sebagai tindak balas kepada peristiwa yang kerap (cth., menaip, menatal, mengubah saiz).
Menyahlantun menangguhkan pelaksanaan fungsi sehingga selepas tempoh masa tertentu berlalu sejak kali terakhir ia digunakan.
import React, { useState, useEffect } from 'react'; const DebouncedSearch = () => { const [searchTerm, setSearchTerm] = useState(''); const [debouncedValue, setDebouncedValue] = useState(''); useEffect(() => { const handler = setTimeout(() => { setDebouncedValue(searchTerm); }, 500); // Delay of 500ms return () => { clearTimeout(handler); // Cleanup on input change }; }, [searchTerm]); useEffect(() => { if (debouncedValue) { console.log('API Call with:', debouncedValue); // Make API call here } }, [debouncedValue]); return ( <input type="text" placeholder="Search..." value={searchTerm} onChange={(e) => setSearchTerm(e.target.value)} /> ); }; export default DebouncedSearch;
Pendikitan memastikan bahawa fungsi dilaksanakan paling banyak sekali dalam selang masa tertentu, tidak kira berapa kali ia dicetuskan semasa selang itu.
import React, { useEffect } from 'react'; const ThrottledScroll = () => { useEffect(() => { const handleScroll = throttle(() => { console.log('Scroll event fired'); }, 1000); // Execute at most once every 1000ms window.addEventListener('scroll', handleScroll); return () => { window.removeEventListener('scroll', handleScroll); }; }, []); return <div> <hr> <h3> <strong>3. Using Libraries (Optional)</strong> </h3> <p>Instead of implementing custom debounce/throttle, you can use popular libraries like:</p> <h4> <strong>Lodash</strong> </h4> <p>Install:<br> </p> <pre class="brush:php;toolbar:false">npm install lodash
Penggunaan:
import { debounce, throttle } from 'lodash'; // Debounce Example const debouncedFunc = debounce(() => console.log('Debounced!'), 500); // Throttle Example const throttledFunc = throttle(() => console.log('Throttled!'), 1000);
Pasang:
npm install react-use
Penggunaan:
import { useDebounce, useThrottle } from 'react-use'; const Demo = () => { const [value, setValue] = useState(''); const debouncedValue = useDebounce(value, 500); const throttledValue = useThrottle(value, 1000); useEffect(() => { console.log('Debounced:', debouncedValue); console.log('Throttled:', throttledValue); }, [debouncedValue, throttledValue]); return ( <input value={value} onChange={(e) => setValue(e.target.value)} placeholder="Type something..." /> ); }; export default Demo;
Feature | Debouncing | Throttling |
---|---|---|
Execution | Executes once after the user stops firing events for a specified time. | Executes at regular intervals during the event. |
Use Cases | Search input, resizing, form validation. | Scroll events, button clicks, API polling. |
Performance | Reduces the number of function calls. | Limits execution to once per interval. |
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