Javascript:无法停止setTimeout

Question

我正在使用代理服务器检查程序并使用以下代码使用setTimeout函数以大约5秒的间隔启动请求;

        function check() {

            var url = document.getElementById('url').value;
            var proxys = document.getElementById('proxys').value.replace(/\n/g,',');

            var proxys = proxys.split(",");

            for (proxy in proxys) {

                var proxytimeout = proxy*5000;

                t = setTimeout(doRequest, proxytimeout, url, proxys[proxy]);

            }
        }

但是一旦他们开始我就无法阻止他们!

        function stopcheck() {

            clearTimeout(t);

        }

修复或更好的方法将更受欢迎.

谢谢Stack Overflow社区!

Answer 1

您的代码有两个主要问题:

1. t 每次超时都会被覆盖,每次迭代都会丢失对先前超时的引用.
2. t可能不是一个全局变量,因此stopcheck()可能无法"看到" t.

更新功能:

function check() {
    var url         = document.getElementById('url').value;
    var proxys      = document.getElementById('proxys').value.replace(/\n/g,',');
    var timeouts    = [];
    var index;
    var proxytimeout;

    proxys = proxys.split(",");
    for (index = 0; index < proxys.length; ++index) {
        proxytimeout                = index * 5000;
        timeouts[timeouts.length]   = setTimeout(
            doRequest, proxytimeout, url, proxys[index];
        );
    }

    return timeouts;
}

function stopcheck(timeouts) {
    for (var i = 0; i < timeouts.length; i++) {        
        clearTimeout(timeouts[i]);
    }
}

使用示例:

var timeouts = check();

// do some other stuff...

stopcheck(timeouts);