当一个方法花费的时间超过预期时,是否使用Javascript方法来提醒用户?[闭门]

除非您具有全局作用域,否则需要传入两个处理程序

function doSocketRequest(normalHandler, tooLongHandler) {
    let timer = null;
    
    // set timeout to 5 seconds, if we hit it then trigger "tooLongHandler"
    timer = setTimeout(tooLongHandler, 5000);
    
    // When we receive our socket response for the event, clear the time and trigger "normalHandler"
    socket.on('some_event_response', (response) => {
        clearTimeout(timer);
        normalHandler(response)
    });
    
    // Emit to server
    socket.emit('some_event', ...etcetc);   
}