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该模块中定义了36种不同的状态，以及状态的解释信息，还有一个模块方法，这个模块相对简单

36种状态

1个json字符串定义了36个元素，每一元素代表了一个状态，每一个状态有一个名称，然后对应一个json字符串，该json字符串中有code值和summary值：code为整形，summary值为string字符串。

var codes = {

Success: {

code: 0,

summary: 'The command executed successfully.'

},

NoSuchDriver: {

code: 6,

summary: 'A session is either terminated or not started'

},

NoSuchElement: {

code: 7,

summary: 'An element could not be located on the page using the given search parameters.'

},

NoSuchFrame: {

code: 8,

summary: 'A request to switch to a frame could not be satisfied because the frame could not be found.'

},

UnknownCommand: {

code: 9,

summary: 'The requested resource could not be found, or a request was received using an HTTP method that is not supported by the mapped resource.'

},

StaleElementReference: {

code: 10,

summary: 'An element command failed because the referenced element is no longer attached to the DOM.'

},

ElementNotVisible: {

code: 11,

summary: 'An element command could not be completed because the element is not visible on the page.'

},

InvalidElementState: {

code: 12,

summary: 'An element command could not be completed because the element is in an invalid state (e.g. attempting to click a disabled element).'

},

UnknownError: {

code: 13,

summary: 'An unknown server-side error occurred while processing the command.'

},

ElementIsNotSelectable: {

code: 15,

summary: 'An attempt was made to select an element that cannot be selected.'

},

JavaScriptError: {

code: 17,

summary: 'An error occurred while executing user supplied JavaScript.'

},

XPathLookupError: {

code: 19,

summary: 'An error occurred while searching for an element by XPath.'

},

Timeout: {

code: 21,

summary: 'An operation did not complete before its timeout expired.'

},

NoSuchWindow: {

code: 23,

summary: 'A request to switch to a different window could not be satisfied because the window could not be found.'

},

InvalidCookieDomain: {

code: 24,

summary: 'An illegal attempt was made to set a cookie under a different domain than the current page.'

},

UnableToSetCookie: {

code: 25,

summary: 'A request to set a cookie\'s value could not be satisfied.'

},

UnexpectedAlertOpen: {

code: 26,

summary: 'A modal dialog was open, blocking this operation'

},

NoAlertOpenError: {

code: 27,

summary: 'An attempt was made to operate on a modal dialog when one was not open.'

},

ScriptTimeout: {

code: 28,

summary: 'A script did not complete before its timeout expired.'

},

InvalidElementCoordinates: {

code: 29,

summary: 'The coordinates provided to an interactions operation are invalid.'

},

IMENotAvailable: {

code: 30,

summary: 'IME was not available.'

},

IMEEngineActivationFailed: {

code: 31,

summary: 'An IME engine could not be started.'

},

InvalidSelector: {

code: 32,

summary: 'Argument was an invalid selector (e.g. XPath/CSS).'

},

SessionNotCreatedException: {

code: 33,

summary: 'A new session could not be created.'

},

MoveTargetOutOfBounds: {

code: 34,

summary: 'Target provided for a move action is out of bounds.'

},

NoSuchContext: {

code: 35,

summary: 'No such context found.'

}

};

一个模块方法

if (typeof module !== "undefined") {

//首先将codes所指的json字符串赋值给模块对象codes(可以供外部调用)

module.exports.codes = codes;

//然后定义供外部调用的函数getSummaryByCode

module.exports.getSummaryByCode = function (code) {

//以10进制来解析code

code = parseInt(code, 10);

for (var c in codes) {

if (typeof codes[c].code !== "undefined" && codes[c].code === code) {

//根据code值找到对应的summary描述信息

return codes[c].summary;

}

}

return 'An error occurred';

};

}

当其他模块加载status模块的时候，该模块自身会检查是否已经初始化过了，如果没有初始化，那就需要执行if方法体的代码。if方法就是将保存36种状态的json字符串串提供给外界，且提供了一个根据code值找到summary值的函数getSummaryByCode。