万象更新 Html5 - h5: h5 通过 web worker 实现多线程（演示如何转移数据的所有权）
示例如下:
h5\webWorker\worker_transferable.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>通过 web worker 实现多线程（演示如何转移数据的所有权）</title>
</head>
<body>
<!--注：运行本示例时，必须要在一个 web server 中运行，不能通过直接打开本地文件的方式运行-->
<button id="buttonStartThread">启动 worker 线程</button>
<div id="result"></div>
<script>
let buttonStartThread = document.getElementById('buttonStartThread');
buttonStartThread.onclick = function() {
let worker = new Worker('worker_transferable.js');
/**
* worker 的 postMessage 的第 2 个参数是一个对象数组（对象必须是 ArrayBuffer 或 MessagePort 或 ImageBitmap 类型）
* 其用于将指定数据的所有权从当前上下文转移到 worker 的上下文（即当前上下文会清除掉这些数据，从而减少内存开销）
*/
let buffer1 = new ArrayBuffer(8);
let buffer2 = new ArrayBuffer(16);
// buffer1 length:8, buffer2 length:16
console.log(`buffer1 length:${buffer1.byteLength}, buffer2 length:${buffer2.byteLength}`);
worker.postMessage({
b1: buffer1,
b2: buffer2
});
// buffer1 length:8, buffer2 length:16
console.log(`buffer1 length:${buffer1.byteLength}, buffer2 length:${buffer2.byteLength}`);
worker.postMessage({
b1: buffer1,
b2: buffer2
}, [buffer1, buffer2]); // 将 buffer1 和 buffer2 的所有权从当前上下文转移到 worker 的上下文
// buffer1 length:0, buffer2 length:0
console.log(`buffer1 length:${buffer1.byteLength}, buffer2 length:${buffer2.byteLength}`); // buffer1 和 buffer2 在当前上下文中被清空了
}
</script>
</body>
</html>
h5\webWorker\worker_transferable.js
onmessage = function(event) {
};
标签：byteLength,万象更新,worker,h5,length,多线程,buffer1,buffer2 From： https://www.cnblogs.com/webabcd/p/18428719/html5_h5_webWorker_worker_transferable