webworker不能做的事：
不能访问document对象
不能访问window对象
不能访问parent对象
专用线程
主页面index.html
<!DOCTYPE html>
<html lang="en">
<head>
<title>test</title>
</head>
<body>
<script type="text/javascript">
onload = function(){
var worker = new Worker('index.js');
worker.onmessage = function(event) {
console.log("Result:" + event.data);
};
worker.onerror = function(error) {
console.log("error:" + error.message);
console.log("filename:" + error.filename);
console.log("lineno:" + error.lineno);
}
setTimeout(function(){
worker.terminate();
},2000)
}
</script>
</body>
</html>脚本文件index.js
function test(n){
return n;
}
var n = 0;
setInterval(function(){
n++;
postMessage(test(n))
},1000);共享线程
页面文件index.html
<!DOCTYPE html>
<html lang="en">
<head>
<title>test</title>
</head>
<body>
<script type="text/javascript">
var worker = new SharedWorker('index.js')
worker.port.onmessage = function(event){
console.log('data：', event.data)
}
worker.port.start()
window.worker = worker;
window.worker.port.postMessage('get')
window.worker.port.postMessage('send message')
</script>
</body>
</html>脚本文件index.js
var data = ''
onconnect = function (e) {
var port = e.ports[0];
port.onmessage = function (e) {
if (e.data === 'get') {
port.postMessage(data);
} else {
data = e.data;
}
}
}