https://kknews.cc/zh-tw/finance/zpxln2q.html [開發經驗分享][JavaScript]浮點數運算出現一堆小數位數 https://dotblogs.com.tw/WillianHsiaoDotNetBLog/2020/01/15/JavascriptFloatCaculateBug?fbclid=IwAR0SnYG7FnesbfENWCsOT_ceGxqab6Q1dksJ3qIr-pe65m55wNBlWLc0Ns0 精確的浮點數運算 ? https://medium.com/pyladies-taiwan/%E7%B2%BE%E7%A2%BA%E7%9A%84%E6%B5%AE%E9%BB%9E%E6%95%B8%E9%81%8B%E7%AE%97-28d34e652e51
Choices.js tom-select
https://stackoverflow.com/questions/784929/what-is-the-not-not-operator-in-javascript https://stackoverflow.com/questions/29312123/how-does-the-double-exclamation-work-in-javascript value !value !!value false true false true false true null true false undefined true false 0 true false -0 true false 1 false true -5 false true NaN true false '' true false ‘hello’ true false
https://stackoverflow.com/questions/6600868/set-default-value-of-javascript-object-attributes``` // default num: 0, unit: ‘pics’ function items(op) { const { num, unit } = Object.assign({}, { num: 0, unit: ‘pics’}, op); }
https://1loc.dev/