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Equivalent to the SharedWorker port in ServiceWorker?

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[前端(javascript) 所属分类 前端(javascript) | 发布者 店小二04 | 时间 2018 | 作者 红领巾 ] 0人收藏点击收藏

SharedWorker uses Message Port to exchange messages with ParentWorker .

ParentWorker var port = new SharedWorker('/worker.js').port; port.onmessage = function(e){ console.log(e.data); }; port.start(); port.postMessage("Hello Shared Worker. I'm Mr. Tab"); SharedWorker (worker.js) onconnect = function(e){ var port = e.ports[0]; port.onmessage = function(e){ console.log(e.data); }; port.start(); port.postMessage("Hello Mr. Tab. I'm Shared Worker."); };

What about Service Worker? Is there anything similar to SharedWorker Port?

Here's how it behaves:

// in the page: navigator.serviceWorker.controller.postMessage("Hi!"); // in the ServiceWorker: self.onmessage = function(event) { event.source; // instance of Client event.data; // "Hi!" // reply event.source.postMessage("Hey!"); }; // back in the page: navigator.serviceWorker.onmessage = function(event) { event.source; // instance of ServiceWorker event.data; // "Hey!" };

At time of writing, Chrome currently sends postmessages from ServiceWorker to Window to window.onmessage, based on an earlier spec. Also, event.source is null.

If you need a solution in the mean time, pass in your own MessageChannel. See demo at https://jakearchibald.github.io/isserviceworkerready/demos/postMessage/

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