没有循环节点JS将数据插入变量

Question

我尝试将数据插入变量中，并在节点js内部函数中循环循环，但是当我尝试将数据推入电报bot时，变量为空，如何正确地将数据插入变量。

错误：

代码：

async function brokeServer(listServer) {
    let nothing = '';
    for (const newServer of listServer) {
        
        ping.sys.probe(newServer.srv_ip, async function(isAlive){
            let msg = isAlive ? 'host ' + newServer.srv_ip + ' is alive' : 'host ' + newServer.srv_ip + ' is dead';

            //console.log(msg);

            let myspace = '\n';
            nothing+=myspace;
            nothing+=msg;

              
        });
    
    }

    MeikelBot.sendMessage(-721865824, nothing);
    
}

Answer 1

它的原因是ping.sys.probe仍然具有异步且尚未正确处理。您需要将其转换为Promise，然后应该与async函数一起使用＆amp; <代码> 循环。

示例（请注意，未经测试）：

function ProbePromise(server_ip) {
    return new Promise((resolve) => {
        ping.sys.probe(server_ip, async function(isAlive){
            resolve(isAlive)
        })
    })
}

async function brokeServer(listServer) {
    let nothing = '';
    for (const newServer of listServer) {
        // use the promise version of Probe
        let isAlive = await ProbePromise(newServer.srv_ip)
        let msg = isAlive ? 'host ' + newServer.srv_ip + ' is alive' : 'host ' + newServer.srv_ip + ' is dead';
        //console.log(msg);
        let myspace = '\n';
        nothing+=myspace;
        nothing+=msg;
    }

    MeikelBot.sendMessage(-721865824, nothing);
}