据我所知，web worker需要写在一个单独的JavaScript文件中，并像这样调用:
new Worker('longrunning.js')
我正在使用闭包编译器来合并和缩小我所有的JavaScript源代码，我不希望将我的worker放在单独的文件中进行分发。有什么办法可以做到吗?
new Worker(function() {
//Long-running work here
});
既然一级函数对JavaScript如此重要，为什么标准的后台工作方式必须从web服务器加载整个其他JavaScript文件呢?
当前回答
https://developer.mozilla.org/es/docs/Web/Guide/Performance/Using_web_workers
// Syntax: asyncEval(code[, listener])
var asyncEval = (function () {
var aListeners = [], oParser = new Worker("data:text/javascript;charset=US-ASCII,onmessage%20%3D%20function%20%28oEvent%29%20%7B%0A%09postMessage%28%7B%0A%09%09%22id%22%3A%20oEvent.data.id%2C%0A%09%09%22evaluated%22%3A%20eval%28oEvent.data.code%29%0A%09%7D%29%3B%0A%7D");
oParser.onmessage = function (oEvent) {
if (aListeners[oEvent.data.id]) { aListeners[oEvent.data.id](oEvent.data.evaluated); }
delete aListeners[oEvent.data.id];
};
return function (sCode, fListener) {
aListeners.push(fListener || null);
oParser.postMessage({
"id": aListeners.length - 1,
"code": sCode
});
};
})();
其他回答
http://www.html5rocks.com/en/tutorials/workers/basics/#toc-inlineworkers
如果您希望动态地创建工作人员脚本，或者创建一个自包含的页面，而不必创建单独的工作人员文件，该怎么办?使用Blob()，您可以通过将工作代码的URL句柄创建为字符串，将工作代码“内联”到与主逻辑相同的HTML文件中
BLOB inline worker的完整示例:
<!DOCTYPE html> <script id="worker1" type="javascript/worker"> // This script won't be parsed by JS engines because its type is javascript/worker. self.onmessage = function(e) { self.postMessage('msg from worker'); }; // Rest of your worker code goes here. </script> <script> var blob = new Blob([ document.querySelector('#worker1').textContent ], { type: "text/javascript" }) // Note: window.webkitURL.createObjectURL() in Chrome 10+. var worker = new Worker(window.URL.createObjectURL(blob)); worker.onmessage = function(e) { console.log("Received: " + e.data); } worker.postMessage("hello"); // Start the worker. </script>
一个简单的承诺版本，Function#callAsWorker，它接受一个thisArg和参数(就像call一样)，并返回一个承诺:
Function.prototype.callAsWorker = function (...args) { return new Promise( (resolve, reject) => { const code = `self.onmessage = e => self.postMessage((${this.toString()}).call(...e.data));`, blob = new Blob([code], { type: "text/javascript" }), worker = new Worker(window.URL.createObjectURL(blob)); worker.onmessage = e => (resolve(e.data), worker.terminate()); worker.onerror = e => (reject(e.message), worker.terminate()); worker.postMessage(args); }); } // Demo function add(...nums) { return nums.reduce( (a,b) => a+b ); } // Let the worker execute the above function, with the specified arguments add.callAsWorker(null, 1, 2, 3).then(function (result) { console.log('result: ', result); });
有一些答案，但这里是另一个内联版本。
注意:“self”参数纯粹是为了检测目的而做的修饰，实际的工作代码从第一个大括号开始，self是正常的
inlineWorker ( "hello world",// initial message to send to worker function(self){ // inline worker code. self.onmessage = function (e) { self.postMessage("thinking..."); for (var i=0;i<100000000;i++) { var r = Math.random(); } self.postMessage(e.data.toUpperCase()); } },function(e){ // optional message handler document.getElementById("log").innerHTML= "from worker:"+e.data; }); function inlineWorker (msg,fn,onMsg) { var w=window, U=!!w.webkitURL?w.webkitURL:w.URL, src=fn.toString(), s=src.indexOf('{'), e=src.lastIndexOf('}'), worker = new Worker(U.createObjectURL( new Blob([ src.substring(s+1,e-1) ], { type: "text/javascript" }) )); if (typeof onMsg==="function") { worker.addEventListener("message",onMsg); } if (msg) { worker.postMessage(msg); } return worker; } <div id="log"></div>
看一下vkThread插件。使用htis插件，你可以在主代码中获取任何函数，并在线程(web worker)中执行它。所以，你不需要创建一个特殊的“web-worker文件”。
http://www.eslinstructor.net/vkthread/
——瓦迪姆
我发现CodePen目前不语法高亮内联<script>标签，不是type="text/javascript"(或没有类型属性)。
因此，我设计了一个类似但略有不同的解决方案，使用带break的标记块，这是摆脱<script>标记而不创建包装器函数(这是不必要的)的唯一方法。
<!DOCTYPE html> <script id="worker1"> worker: { // Labeled block wrapper if (typeof window === 'object') break worker; // Bail if we're not a Worker self.onmessage = function(e) { self.postMessage('msg from worker'); }; // Rest of your worker code goes here. } </script> <script> var blob = new Blob([ document.querySelector('#worker1').textContent ], { type: "text/javascript" }) // Note: window.webkitURL.createObjectURL() in Chrome 10+. var worker = new Worker(window.URL.createObjectURL(blob)); worker.onmessage = function(e) { console.log("Received: " + e.data); } worker.postMessage("hello"); // Start the worker. </script>
