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Frontend Development

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var foo = bar === 'xxx' ? true : false;
// 更好的代码是：
var foo = bar === 'xxx';

两个和三个等号的判断，都是得到布尔值。

	// create context with no upfront defaultValue
	// without having to do undefined check all the time
	function createCtx<A>() {
	const ctx = React.createContext<A \| undefined>(undefined)
	function useCtx() {
	const c = React.useContext(ctx)
	if (!c) throw new Error("useCtx must be inside a Provider with a value")
	return c
	}
	return [useCtx, ctx.Provider] as const

	<html>
	<body>
	<script>
	// @author: ideawu
	// @link: http://www.ideawu.net/blog/archives/1021.html
	var swap_count = 0;
	var cmp_count = 0;

	// https://gist.github.com/wintercn/c30464ed3732ee839c3eeed316d73253
	function wintercn_qsort(arr, start, end){

	// UPDATE: In 2023, you should probably stop using this! The narrow version of Safari that
	// does not support `nomodule` is probably not being used anywhere. The code below is left
	// for posterity.

	/**
	* Safari 10.1 supports modules, but does not support the `nomodule` attribute - it will
	* load <script nomodule> anyway. This snippet solve this problem, but only for script
	* tags that load external code, e.g.: <script nomodule src="nomodule.js"></script>
	*
	* Again: this will not prevent inline script, e.g.:

	function get(uri) {
	return http(uri,'GET');
	}
	function post(uri,data) {
	if(typeof data === 'object' && !(data instanceof String \|\| (FormData && data instanceof FormData))) {
	var params = [];
	for(var p in data) {
	if(data[p] instanceof Array) {
	for(var i = 0; i < data[p].length; i++) {
	params.push( encodeURIComponenet(p) + '[]=' + encodeURIComponenet(data[p][i]);

	//Chrome上能用的
	["Image", "Audio", "MediaController", "TrackEvent", "Option", "PopStateEvent", "HashChangeEvent", "PageTransitionEvent", "Event", "CustomEvent", "MutationObserver", "Document", "FormData", "XMLHttpRequest", "FormData", "IDBVersionChangeEvent", "StorageEvent", "RTCSessionDescription", "RTCIceCandidate", "MediaStreamEvent", "Notification", "Blob", "FileReader", "ErrorEvent", "Worker", "SharedWorker", "TransitionEvent"]

	//标准里有但是还不能用的
	["RelatedEvent", "DragEvent", "AnonXMLHttpRequest", "RTCPeerConnection", "RTCPeerConnectionIceEvent", "DataChannelEvent", "ClipboardEvent", "FileReaderSync", "BlobBuilder", "FileSaver", "ParGroup", "SeqGroup", "Animation", "PseudoElementReference", "KeyframeAnimationEffect", "PathAnimationEffect", "TimingEvent", "AnimationEvent"]

	// @license http://opensource.org/licenses/MIT
	// copyright Paul Irish 2015


	// Date.now() is supported everywhere except IE8. For IE8 we use the Date.now polyfill
	// github.com/Financial-Times/polyfill-service/blob/master/polyfills/Date.now/polyfill.js
	// as Safari 6 doesn't have support for NavigationTiming, we use a Date.now() timestamp for relative values

	// if you want values similar to what you'd get with real perf.now, place this towards the head of the page
	// but in reality, you're just getting the delta between now() calls, so it's not terribly important where it's placed

	function getCommonParent(el1,el2){

	var parents1 = [];
	var el = el1;
	while(el) {
	parents1.unshift(el);
	el = el.parentNode;
	}

	var parents2 = [];