html5 worker example (1) Why the test does not work_html5 tutorial skills

function messageHandler(e) {
postMessage("worker says: " e.data " too");
}
addEventListener("message", messageHandler, true);
postMessage("2222222222");

< head>




-->


< ;script type="text/javascript">
if(typeof(Worker)!=="undefined"){
console.log("zhichi worke");
}else{
console.log("no support!");
}
function messageHandler(e){
console.log(e.data);
}
function errorHandler(e){
console.log(e.message, e);
}
var myWorker = new Worker("task.js");
myWorker.addEventListener("message", messageHandler, true);
myWorker.addEventListener("error", errorHandler, true);
myWorker.postMessage("1 fangsong d");


< /html>