CocosCreator框架设计Demo,内容在这篇文章介绍：

(function () { 'use strict'; function errMsg(errCode, msg) { return (msg || "") + " (SystemJS Error#" + errCode + " " + "https://git.io/JvFET#" + errCode + ")"; } var hasSymbol = typeof Symbol !== 'undefined'; var hasSelf = typeof self !== 'undefined'; var hasDocument = typeof document !== 'undefined'; var envGlobal = hasSelf ? self : global; var baseUrl; if (hasDocument) { var baseEl = document.querySelector('base[href]'); if (baseEl) baseUrl = baseEl.href; } if (!baseUrl && typeof location !== 'undefined') { baseUrl = location.href.split('#')[0].split('?')[0]; var lastSepIndex = baseUrl.lastIndexOf('/'); if (lastSepIndex !== -1) baseUrl = baseUrl.slice(0, lastSepIndex + 1); } var backslashRegEx = /\\/g; function resolveIfNotPlainOrUrl (relUrl, parentUrl) { if (relUrl.indexOf('\\') !== -1) relUrl = relUrl.replace(backslashRegEx, '/'); // protocol-relative if (relUrl[0] === '/' && relUrl[1] === '/') { return parentUrl.slice(0, parentUrl.indexOf(':') + 1) + relUrl; } // relative-url else if (relUrl[0] === '.' && (relUrl[1] === '/' || relUrl[1] === '.' && (relUrl[2] === '/' || relUrl.length === 2 && (relUrl += '/')) || relUrl.length === 1 && (relUrl += '/')) || relUrl[0] === '/') { var parentProtocol = parentUrl.slice(0, parentUrl.indexOf(':') + 1); // Disabled, but these cases will give inconsistent results for deep backtracking //if (parentUrl[parentProtocol.length] !== '/') // throw Error('Cannot resolve'); // read pathname from parent URL // pathname taken to be part after leading "/" var pathname; if (parentUrl[parentProtocol.length + 1] === '/') { // resolving to a :// so we need to read out the auth and host if (parentProtocol !== 'file:') { pathname = parentUrl.slice(parentProtocol.length + 2); pathname = pathname.slice(pathname.indexOf('/') + 1); } else { pathname = parentUrl.slice(8); } } else { // resolving to :/ so pathname is the /... part pathname = parentUrl.slice(parentProtocol.length + (parentUrl[parentProtocol.length] === '/')); } if (relUrl[0] === '/') return parentUrl.slice(0, parentUrl.length - pathname.length - 1) + relUrl; // join together and split for removal of .. and . segments // looping the string instead of anything fancy for perf reasons // '../../../../../z' resolved to 'x/y' is just 'z' var segmented = pathname.slice(0, pathname.lastIndexOf('/') + 1) + relUrl; var output = []; var segmentIndex = -1; for (var i = 0; i < segmented.length; i++) { // busy reading a segment - only terminate on '/' if (segmentIndex !== -1) { if (segmented[i] === '/') { output.push(segmented.slice(segmentIndex, i + 1)); segmentIndex = -1; } } // new segment - check if it is relative else if (segmented[i] === '.') { // ../ segment if (segmented[i + 1] === '.' && (segmented[i + 2] === '/' || i + 2 === segmented.length)) { output.pop(); i += 2; } // ./ segment else if (segmented[i + 1] === '/' || i + 1 === segmented.length) { i += 1; } else { // the start of a new segment as below segmentIndex = i; } } // it is the start of a new segment else { segmentIndex = i; } } // finish reading out the last segment if (segmentIndex !== -1) output.push(segmented.slice(segmentIndex)); return parentUrl.slice(0, parentUrl.length - pathname.length) + output.join(''); } } /* * Import maps implementation * * To make lookups fast we pre-resolve the entire import map * and then match based on backtracked hash lookups * */ function resolveUrl (relUrl, parentUrl) { return resolveIfNotPlainOrUrl(relUrl, parentUrl) || (relUrl.indexOf(':') !== -1 ? relUrl : resolveIfNotPlainOrUrl('./' + relUrl, parentUrl)); } function resolveAndComposePackages (packages, outPackages, baseUrl, parentMap, parentUrl) { for (var p in packages) { var resolvedLhs = resolveIfNotPlainOrUrl(p, baseUrl) || p; var rhs = packages[p]; // package fallbacks not currently supported if (typeof rhs !== 'string') continue; var mapped = resolveImportMap(parentMap, resolveIfNotPlainOrUrl(rhs, baseUrl) || rhs, parentUrl); if (!mapped) { targetWarning('W1', p, rhs, 'bare specifier did not resolve'); } else outPackages[resolvedLhs] = mapped; } } function resolveAndComposeImportMap (json, baseUrl, outMap) { if (json.imports) resolveAndComposePackages(json.imports, outMap.imports, baseUrl, outMap, null); var u; for (u in json.scopes || {}) { var resolvedScope = resolveUrl(u, baseUrl); resolveAndComposePackages(json.scopes[u], outMap.scopes[resolvedScope] || (outMap.scopes[resolvedScope] = {}), baseUrl, outMap, resolvedScope); } for (u in json.depcache || {}) outMap.depcache[resolveUrl(u, baseUrl)] = json.depcache[u]; for (u in json.integrity || {}) outMap.integrity[resolveUrl(u, baseUrl)] = json.integrity[u]; } function getMatch (path, matchObj) { if (matchObj[path]) return path; var sepIndex = path.length; do { var segment = path.slice(0, sepIndex + 1); if (segment in matchObj) return segment; } while ((sepIndex = path.lastIndexOf('/', sepIndex - 1)) !== -1) } function applyPackages (id, packages) { var pkgName = getMatch(id, packages); if (pkgName) { var pkg = packages[pkgName]; if (pkg === null) return; if (id.length > pkgName.length && pkg[pkg.length - 1] !== '/') { targetWarning('W2', pkgName, pkg, "should have a trailing '/'"); } else return pkg + id.slice(pkgName.length); } } function targetWarning (code, match, target, msg) { console.warn(errMsg(code, "Package target " + msg + ", resolving target '" + target + "' for " + match)); } function resolveImportMap (importMap, resolvedOrPlain, parentUrl) { var scopes = importMap.scopes; var scopeUrl = parentUrl && getMatch(parentUrl, scopes); while (scopeUrl) { var packageResolution = applyPackages(resolvedOrPlain, scopes[scopeUrl]); if (packageResolution) return packageResolution; scopeUrl = getMatch(scopeUrl.slice(0, scopeUrl.lastIndexOf('/')), scopes); } return applyPackages(resolvedOrPlain, importMap.imports) || resolvedOrPlain.indexOf(':') !== -1 && resolvedOrPlain; } /* * SystemJS Core * * Provides * - System.import * - System.register support for * live bindings, function hoisting through circular references, * reexports, dynamic import, import.meta.url, top-level await * - System.getRegister to get the registration * - Symbol.toStringTag support in Module objects * - Hookable System.createContext to customize import.meta * - System.onload(err, id, deps) handler for tracing / hot-reloading * * Core comes with no System.prototype.resolve or * System.prototype.instantiate implementations */ var toStringTag = hasSymbol && Symbol.toStringTag; var REGISTRY = hasSymbol ? Symbol() : '@'; function SystemJS () { this[REGISTRY] = {}; } var systemJSPrototype = SystemJS.prototype; systemJSPrototype.import = function (id, parentUrl) { var loader = this; return Promise.resolve(loader.prepareImport()) .then(function() { return loader.resolve(id, parentUrl); }) .then(function (id) { var load = getOrCreateLoad(loader, id); return load.C || topLevelLoad(loader, load); }); }; /