如何使用模块将函数移动到 NightwatchJS 脚本之外？

Question

如果我在 Nightwatch 脚本中编写了多个函数 - 如下所示 - 我如何将它们移到脚本之外以便其他脚本也能使用？

function firstFunction (aaa, callback) {
    // do async stuff
    callback(result)
}

function secondFunction (bbb, callback) {
    firstFunction (aaa, function (result) {
    // do async stuff
    callback(result)
    }
}

secondFunction (ccc, function (result) {
    // script actions/verifications
}

我只想将最后一部分（脚本操作）保留在我的脚本中，并将函数移到外面以便其他脚本也可以使用。

LE：我创建了一个名为 Utils 的单独文件夹，我在其中创建了 2 个文件 - getColumnValues.js 和 getTableColumns.js（我的函数在脚本中运行）。

我的文件内容：

// getTableColumns.js（第一个函数）

exports.getTableColumns = function (tableSelector, callback) {
    var columnNames = [];
    var tableHeaderSelector = tableSelector + ' > tbody > tr:nth-of-type(1) > th';
    this.api.elements('css selector', tableHeaderSelector, function (objectResults) {
        for (var i in objectResults.value) {
            this.elementIdAttribute(objectResults.value[i].ELEMENT, 'innerText', function(result) {
                columnNames.push(result.value);
                if (columnNames.length == objectResults.value.length) {
                    callback(columnNames);
                }
            });
        }
    });
}

// getColumnValues.js（第二个函数）

var path = require('path'); var utils = require( path.resolve( __dirname, "./getTableColumns" ) );

exports.getColumnValues = function (columnName, tableSelector, callback) {
    utils.getTableColumns(tableSelector, function (columnList) {
        var columnIndex = columnList.indexOf(columnName) + 1;
        var columnValues = [];
        cellSelector = tableSelector + ' > tbody > tr:nth-of-type(3) > td:nth-of-type(' + columnIndex + ')';
        this.api.element('css selector', cellSelector, function (objectResult) {
            this.elementIdAttribute(objectResult.value.ELEMENT, 'childElementCount', function(result1) {
                for (var j = 2; j < 22; j++) {
                    cellSelector = tableSelector + ' > tbody > tr:nth-of-type(' + j + ') > td:nth-of-type(' + columnIndex + ')';
                    this.api.element('css selector', cellSelector, function (objectResult) {
                        this.elementIdAttribute(objectResult.value.ELEMENT, 'innerText', function(result) {
                            columnValues.push(result.value);
                            if (columnValues.length == 20) {
                                callback(columnValues);
                            }
                        });
                    });             
                }
            });
        }); 
    });
}

//myScript.js

var utils = require('../../lib/utils/getColumnValues.js');
utils.getColumnValues('Route', 'table.table-striped', function (result) {
//do something
}

当我运行这样的脚本时，我得到这个错误：“ReferenceError: client is not defined 在 Object.exports.getTableColumns (C:\automation\lib\utils\getTableColumns.js:4:9) 在 Object.exports.getColumnValues (C:\automation\lib\utils\getColumnValues.js:5:15)"

如果我使用 this.api 更改客户端，我会收到此错误：

Running:  Demo test
 ✖ TypeError: Cannot read property 'elements' of undefined
    at Object.exports.getTableColumns (C:\automation\lib\utils\getTableColumns.js:4:17)
    at Object.exports.getColumnValues (C:\automation\lib\utils\getColumnValues.js:5:15)
    at Object.Demo test (C:\automation\tests\Kite\demotest1.js:55:16)
    at Module.call (C:\automation\lib\nightwatch\lib\runner\module.js:62:34)
    at C:\automation\lib\nightwatch\lib\runner\testcase.js:70:29

FAILED:  1 errors (15ms)

 _________________________________________________

 TEST FAILURE: 1 error during execution,  0 assertions failed, 0 passed. (93ms)

 × Kite\demotest1

   - Demo test (15ms)

     Error while running [Kite / Demotest1 / Demo test]:

     TypeError: Cannot read property 'elements' of undefined
       at Object.exports.getTableColumns (C:\automation\lib\utils\getTableColumns.js:4:17)
       at Object.exports.getColumnValues (C:\automation\lib\utils\getColumnValues.js:5:15)
       at Object.Demo test (C:\automation\tests\Kite\demotest1.js:55:16)
       at Module.call (C:\automation\lib\nightwatch\lib\runner\module.js:62:34)
       at C:\automation\lib\nightwatch\lib\runner\testcase.js:70:29

Answer 1

是：

使用您的函数创建一个文件，并将它们公开为一个模块
通过要求您之前创建的文件在两个脚本中使用您的函数

就这么简单：

// utils/getTableColumns
// Note the first argument: client
exports.getTableColumns = (client, tableSelector, callback) => {
  // use the client here
  client.api.element('css selector', tableSelector, () => {
    callback();
  });
}

在你的第二个文件中：

var utils = require('../../lib/utils/getColumnValues.js');


describe("suite" , () => {
  it("should test", test);
});

function test(client){
  // Pass the client as an argument
  utils.getColumnValues(client, 'Route', 'table.table-striped', function (result) {
    //do something
  }
}

如何使用模块将函数移动到 NightwatchJS 脚本之外？

How to move functions outside a NightwatchJS script using modules?

nightwatch.js