javascript - 是否可以终止正在运行的网络 worker ？

Question

我有一个网络 worker 使用 ajax 请求运行一项耗时的例行任务。我可以在不等待它们完成的情况下从主线程终止它们吗？

这就是我生成和终止它的方式:

$("button.parse-categories").click(function() {
    if (parseCategoriesActive==false) {
        parseCategoriesActive = true;
        parseCategoriesWorker = new Worker("parseCategories.js");


        $("button.parse-categories-cancel").click(function() {
            parseCategoriesWorker.terminate();
            parseCategoriesActive = false;
        });             
    }
});

这是 worker 代码:

function myAjax(url, async, callback) {
    xmlhttp = new XMLHttpRequest();
    xmlhttp.onreadystatechange=function() {
        if (xmlhttp.readyState==4 && xmlhttp.status==200)
            callback(xmlhttp.responseText);
        if (xmlhttp.readyState==4 && xmlhttp.status!=200) {
            self.postMessage("error");
            throw "error in ajax: "+xmlhttp.status;
        }
    }
    xmlhttp.open("GET", url, async);
    xmlhttp.send();
}

var parseCategoriesActive = true;
var counter = 0;
do {
    myAjax('parser.php', false, function(resp) {
        if (resp=='success')
            parseCategoriesActive = false;
        else {
            counter += Number(resp);
            self.postMessage(counter);
        }       
    });
} while (parseCategoriesActive==true);

Answer 1

你可以使用 terminate() 杀死任何网络 worker .

引自 MDN :

The Worker.terminate() method immediately terminates the Worker. This does not offer the worker an opportunity to finish its operations; it is simply stopped at once.