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dataUrl.slice(5, separatorIndex) : ""; var payload = separatorIndex >= 0 ? dataUrl.slice(separatorIndex + 1) : ""; var mimeMatch = /^([^;]+)/.exec(metadata); var mimeType = mimeMatch ? mimeMatch[1] : "image/png"; var blob = null; try { if (metadata.toLowerCase().indexOf(";base64") >= 0) { var binary = root.atob(payload); var bytes = new Uint8Array(binary.length); for (var index = 0; index < binary.length; index += 1) { bytes[index] = binary.charCodeAt(index); } blob = new root.Blob([bytes], { type: mimeType }); } else { blob = new root.Blob([decodeURIComponent(payload)], { type: mimeType }); } } catch (e) { blob = null; } root.setTimeout(function() { callback(blob); }, 0); }; } if (root.URL && typeof root.URL.canParse !== "function") { root.URL.canParse = function(url, base) { try { if (base === undefined) { new root.URL(url); } else { new root.URL(url, base); } return true; } catch (e) { return false; } }; } if (typeof root.requestIdleCallback !== "function") { root.requestIdleCallback = function(callback) { var start = Date.now(); return root.setTimeout(function() { callback({ didTimeout: false, timeRemaining: function() { return Math.max(0, 50 - (Date.now() - start)); } }); }, 1); }; } if (typeof root.cancelIdleCallback !== "function") { root.cancelIdleCallback = function(id) { root.clearTimeout(id); }; } if (typeof root.AbortController === "undefined") { var AbortSignalPolyfill = function() { this.aborted = false; this.onabort = null; }; AbortSignalPolyfill.prototype.addEventListener = function(type, listener) { if (type === "abort") { this.onabort = listener; } }; AbortSignalPolyfill.prototype.removeEventListener = function(type, listener) { if (type === "abort" && this.onabort === listener) { this.onabort = null; } }; AbortSignalPolyfill.prototype.dispatchEvent = function(event) { if (event && event.type === "abort" && typeof this.onabort === "function") { this.onabort.call(this, event); } return true; }; root.AbortController = function AbortController() { this.signal = new AbortSignalPolyfill(); }; root.AbortController.prototype.abort = function() { if (this.signal.aborted) { return; } this.signal.aborted = true; this.signal.dispatchEvent({ type: "abort" }); }; } } catch (e) {} })();

Horsehead Nebula

Cygnus widefield

Horsehead Nebula

M42

未命名作品

M81 M82

Rosette Nebula