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不要使用Scrollview渲染大量数据项
\n\n\nScrollView组件一次渲染所有子级,处理大量数据会直接影响应用程序的性能。为了处理大量项目，React Native提供了一个名为的组件FlatList。此组件可确保项目被延迟加载，以使应用程序不会消耗不一致的内存。
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不要使用Scrollview渲染大量数据项
\n\n\nScrollView组件一次渲染所有子级,处理大量数据会直接影响应用程序的性能。为了处理大量项目，React Native提供了一个名为的组件FlatList。此组件可确保项目被延迟加载，以使应用程序不会消耗不一致的内存。
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var parser = require('cron-parser');\n\ntry {\n var interval = parser.parseExpression('*/2 * * * *');\n\n console.log('Date: ', interval.next().toString()); // Sat Dec 29 2012 00:42:00 GMT+0200 (EET)\n console.log('Date: ', interval.next().toString()); // Sat Dec 29 2012 00:44:00 GMT+0200 (EET)\n\n console.log('Date: ', interval.prev().toString()); // Sat Dec 29 2012 00:42:00 GMT+0200 (EET)\n console.log('Date: ', interval.prev().toString()); // Sat Dec 29 2012 00:40:00 GMT+0200 (EET)\n} catch (err) {\n console.log('Error: ' + err.message);\n}使用变量判断
\nuseEffect(() => {\nlet isComponentMounted = true;\nconst fetchData = async () => {\n const response = await fetch('https://jsonplaceholder.typicode.com/todos/1');\n const newData = await response.json();\n if(isComponentMounted) {\n setTodo(newData);\n }\n};\nfetchData();\nreturn () => {\n isComponentMounted = false;\n}\n}, []);推荐方案:对于http请求使用DOM标准中的AbortController取消
\nuseEffect(() => {\nlet abortController = new AbortController();\nconst fetchData = async () => {\n try {\n const response = await fetch('https://jsonplaceholder.typicode.com/todos/1', {\n signal: abortController.signal,\n });\n const newData = await response.json();\n setTodo(newData);\n }\n catch(error) {\n if (error.name === 'AbortError') {\n // Handling error thrown by aborting request\n }\n }\n};\nfetchData();\nreturn () => {\n abortController.abort();\n}\n}, []);财务软件Flexcube令人困惑的界面，导致银行意外地偿还了全部贷款的本金-其中大部分要到2023年才到期。
"}},{"node":{"frontmatter":{"title":"近3万台Mac设备感染了新型Silver Sparrow恶意软件","publish":true,"cover":"https://pics1.baidu.com/feed/b58f8c5494eef01f8a4cbf9ddac8802dbd317dc8.jpeg?token=2fbc7bec485395b8b41c4c4d13042896&s=7AA7A944C3B285CA447E90830300E0CB","showCover":true,"date":"2021-02-28","category":"security","url":"https://baijiahao.baidu.com/s?id=1692530519049327993&wfr=spider&for=pc","author":"E安全","translator":"","tags":["free"],"priority":1},"html":""}}]}}