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?
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>
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>
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
});
};
})();
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>