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?
将Adria的响应放在一个可复制粘贴的函数中,该函数适用于当前的Chrome和FF,但不适用于IE10 (worker from blob会导致安全错误)。
var newWorker = function (funcObj) {
// Build a worker from an anonymous function body
var blobURL = URL.createObjectURL(new Blob(
['(', funcObj.toString(), ')()'],
{type: 'application/javascript'}
));
var worker = new Worker(blobURL);
// Won't be needing this anymore
URL.revokeObjectURL(blobURL);
return worker;
}
下面是一个工作示例http://jsfiddle.net/ubershmekel/YYzvr/
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
});
};
})();
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>
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>
这只是上面的一个补充-我在jsFiddle中有一个很好的模板用于测试web worker。而不是Blob,它使用jsFiddles ?js api:
function workerFN() {
self.onmessage = function(e) {
switch(e.data.name) {
case "" :
break;
default:
console.error("Unknown message:", e.data.name);
}
}
}
// This is a trick to generate real worker script that is loaded from server
var url = "/echo/js/?js="+encodeURIComponent("("+workerFN.toString()+")()");
var worker = new Worker(url);
worker.addEventListener("message", function(e) {
switch(e.data.name) {
case "" :
break;
default:
console.error("Unknown message:", e.data.name);
}
})
有普通的web worker模板和共享worker模板。