update src/utils/hackTimer.js.

在worker中封装定时器

Signed-off-by: 周旭湘 <3423729430@qq.com>

src/utils/hackTimer.js

@@ -0,0 +1,147 @@
+(function (workerScript) {
+	if (!/MSIE 10/i.test (navigator.userAgent)) {
+		try {
+			let blob = new Blob (["\
+let fakeIdToId = {};\
+onmessage = function (event) {\
+	let data = event.data,\
+		name = data.name,\
+		fakeId = data.fakeId,\
+		time;\
+	if(data.hasOwnProperty('time')) {\
+		time = data.time;\
+	}\
+	switch (name) {\
+		case 'setInterval':\
+			fakeIdToId[fakeId] = setInterval(function () {\
+				postMessage({fakeId: fakeId});\
+			}, time);\
+			break;\
+		case 'clearInterval':\
+			if (fakeIdToId.hasOwnProperty (fakeId)) {\
+				clearInterval(fakeIdToId[fakeId]);\
+				delete fakeIdToId[fakeId];\
+			}\
+			break;\
+		case 'setTimeout':\
+			fakeIdToId[fakeId] = setTimeout(function () {\
+				postMessage({fakeId: fakeId});\
+				if (fakeIdToId.hasOwnProperty (fakeId)) {\
+					delete fakeIdToId[fakeId];\
+				}\
+			}, time);\
+			break;\
+		case 'clearTimeout':\
+			if (fakeIdToId.hasOwnProperty (fakeId)) {\
+				clearTimeout(fakeIdToId[fakeId]);\
+				delete fakeIdToId[fakeId];\
+			}\
+			break;\
+	}\
+}\
+"]);
+			// Obtain a blob URL reference to our worker 'file'.
+			workerScript = window.URL.createObjectURL(blob);
+		} catch (error) {
+			/* Blob is not supported, use external script instead */
+		}
+	}
+	let worker,
+		fakeIdToCallback = {},
+		lastFakeId = 0,
+		maxFakeId = 0x7FFFFFFF, // 2 ^ 31 - 1, 31 bit, positive values of signed 32 bit integer
+		logPrefix = 'HackTimer.js by turuslan: ';
+	if (typeof (Worker) !== 'undefined') {
+		function getFakeId () {
+			do {
+				if (lastFakeId == maxFakeId) {
+					lastFakeId = 0;
+				} else {
+					lastFakeId ++;
+				}
+			} while (fakeIdToCallback.hasOwnProperty (lastFakeId));
+			return lastFakeId;
+		}
+		try {
+			worker = new Worker (workerScript);
+			window.reliableSetInterval = function (callback, time /* , parameters */) {
+				let fakeId = getFakeId ();
+				fakeIdToCallback[fakeId] = {
+					callback: callback,
+					parameters: Array.prototype.slice.call(arguments, 2)
+				};
+				worker.postMessage ({
+					name: 'setInterval',
+					fakeId: fakeId,
+					time: time
+				});
+				return fakeId;
+			};
+			window.reliableClearInterval = function (fakeId) {
+				if (fakeIdToCallback.hasOwnProperty(fakeId)) {
+					delete fakeIdToCallback[fakeId];
+					worker.postMessage ({
+						name: 'clearInterval',
+						fakeId: fakeId
+					});
+				}
+			};
+			window.reliableSetTimeout = function (callback, time /* , parameters */) {
+				let fakeId = getFakeId ();
+				fakeIdToCallback[fakeId] = {
+					callback: callback,
+					parameters: Array.prototype.slice.call(arguments, 2),
+					isTimeout: true
+				};
+				worker.postMessage ({
+					name: 'setTimeout',
+					fakeId: fakeId,
+					time: time
+				});
+				return fakeId;
+			};
+			window.reliableClearTimeout = function (fakeId) {
+				if (fakeIdToCallback.hasOwnProperty(fakeId)) {
+					delete fakeIdToCallback[fakeId];
+					worker.postMessage ({
+						name: 'clearTimeout',
+						fakeId: fakeId
+					});
+				}
+			};
+			worker.onmessage = function (event) {
+				let data = event.data,
+					fakeId = data.fakeId,
+					request,
+					parameters,
+					callback;
+				if (fakeIdToCallback.hasOwnProperty(fakeId)) {
+					request = fakeIdToCallback[fakeId];
+					callback = request.callback;
+					parameters = request.parameters;
+					if (request.hasOwnProperty ('isTimeout') && request.isTimeout) {
+						delete fakeIdToCallback[fakeId];
+					}
+				}
+				if (typeof (callback) === 'string') {
+					try {
+						callback = new Function (callback);
+					} catch (error) {
+						console.log (logPrefix + 'Error parsing callback code string: ', error);
+					}
+				}
+				if (typeof (callback) === 'function') {
+					callback.apply (window, parameters);
+				}
+			};
+			worker.onerror = function (event) {
+				console.log (event);
+			};
+		} catch (error) {
+			console.log (logPrefix + 'Initialisation failed');
+			console.error (error);
+		}
+	} else {
+		console.log (logPrefix + 'Initialisation failed - HTML5 Web Worker is not supported');
+	}
+}) ('HackTimerWorker.js');