JavaScript for decent coding

Jiedao jdon 2021-05-03 23:29:26
javascript decent coding


Avoid relying on null The difference between and undefined. This often leads to code vulnerability . Use non mandatory equality when checking the equality of any one of them (==)null. Avoid using both to represent different types of “ No value ” situation , for example “unknown field” And “no value for today”.

Be careful not to use true and false check zero . If there are numbers , It usually needs to be treated in the same way as any other number - Unlike other false values .

Floating point operation , There are common pitfalls . Consider doing and doing as little as possible on the client side / Or use JavaScript Of Digital Library .

Pay attention to the function support in different browsers . Or use only those supported by all browsers supported by the application , Or perform incremental enhancement . see also I can use [url=https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise#Browser_compatibility]MDN Document page [/url] Reference on , Browser compatibility table and ECMAScript Compatibility table . Use linter plug-in unit Automatically perform compatibility checks . Some features may be transformed by your build settings , Or is it polyfilled - Make them available in older browsers .

avoid setTimeout() Or something like vulnerability or incomprehension . Through careful selection ( Usually by trial and error ) Run a piece of code after a time delay , It may happen, it may be difficult to achieve / The plan of repair . The reason why this method works ( At least for some time ) Little known to the author , And lead to fragile and unpredictable behavior - Especially when the delay is nonzero .

Pay attention to instance methods that mutate in situations that may not be expected . These include Array On the spot reverse(), And many Moment.js Method ( Seriously consider alternatives , Such as date-fns or Luxon).

Array sort() Convert elements to strings , And sort them alphabetically by default . For anything but strings , It's not likely to be what you want - The function of comparator must be given .

character string replace() Replace the first match only when using a string as a pattern . Global substitution requires regular expressions .

Try to avoid duck Type checking . If the duck To change , They break easily , And it doesn't convey the intention very well .

Avoid layout bumps caused by cross read and write . Group read and write as much as possible Lead to layout / The properties of rearrangement .

Avoid overwork in response to user input . This includes calculation , Screen updates and requests to the server . Consider removing jitters or limiting keyboard input and certain types of mouse events .

Avoid using outdated technology . The progress of language continues to bring about the renewal of many traditional technologies , A better alternative . Use them . Examples include async / await And template string .

 

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https://qdmana.com/2021/05/20210503232846402T.html

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