Node Selenium ChromeDriver Ubuntu NoSuchSessionError：此驱动程序实例没有有效的会话ID

Question

嘿我正在尝试在

上启动Selenium实例

• OS：Ubuntu 16.04 64bit / Linux 4.4.0-36-generic
• 节点：v6.5.0
• NPM：3.10.3
• “chromedriver”：“^ 2.23.1”，
• “selenium-webdriver”：“^ 3.0.0-beta-2”，

我一直收到这个错误。

/var/www/node-bin/portlight-orders/node_modules/selenium-webdriver/lib/webdriver.js:432
        throw new error.NoSuchSessionError(
        ^

NoSuchSessionError: This driver instance does not have a valid session ID (did you call WebDriver.quit()?) and may no longer be used.
    at WebDriverError (/var/www/node-bin/portlight-orders/node_modules/selenium-webdriver/lib/error.js:27:5)
    at NoSuchSessionError (/var/www/node-bin/portlight-orders/node_modules/selenium-webdriver/lib/error.js:122:5)
    at checkHasNotQuit (/var/www/node-bin/portlight-orders/node_modules/selenium-webdriver/lib/webdriver.js:432:15)
    at Driver.schedule (/var/www/node-bin/portlight-orders/node_modules/selenium-webdriver/lib/webdriver.js:393:5)
    at Driver.quit (/var/www/node-bin/portlight-orders/node_modules/selenium-webdriver/lib/webdriver.js:480:23)
    at exitHandler (/var/www/node-bin/portlight-orders/api/services/Selenium.js:12:9)
    at emitOne (events.js:96:13)
    at process.emit (events.js:188:7)
    at process._fatalException (bootstrap_node.js:296:26)

瞥了一眼我发现chromedriver正在运行 http://image.prntscr.com/image/dfc336afbf6f46d59017b4135e9547c3.png

var webdriver = require('selenium-webdriver'),
    By = webdriver.By,
    until = webdriver.until;

var driver = new webdriver.Builder()
    .forBrowser('chrome')
    .build();

module.exports = driver;

function exitHandler(options, err) {
    driver.quit()
}

//do something when app is closing
process.on('exit', exitHandler.bind(null,{cleanup:true}));

//catches ctrl+c event
process.on('SIGINT', exitHandler.bind(null, {exit:true}));

//catches uncaught exceptions
process.on('uncaughtException', exitHandler.bind(null, {exit:true}));

Answer 1

在使用任何驱动程序实例之前，请检查该驱动程序会话是否处于活动状态，我们有两种情况 1.会话ID存在  如果会话ID存在，那么我们可以更进一步 2.会话ID不存在 所以我们不能再进一步停止