[英]JavaScript - returning value from anonymous function parameter
I am using npm 'powershell' package for executing PowerShell commands and reading related output. 我正在使用npm'powershell'软件包执行PowerShell命令并读取相关输出。 I want to write a function that would return standard command output (so that I could call the the function and use its return value in assertions etc.).
我想编写一个将返回标准命令输出的函数(以便我可以调用该函数并在断言中使用其返回值等)。
const PowerShell = require("powershell");
var myFunction = function (command) {
let ps = new PowerShell(command);
ps.on("error", err => {
console.error(err);
});
ps.on("output", data => {
console.log(data);
//return data; <-- this does not work
});
ps.on("error-output", data => {
console.error(data);
});
ps.on("end", code => {
console.log("The end");
});
};
I want myFunction
to return data value (from standard output). 我希望
myFunction
返回数据值(从标准输出)。 However, I don't know how to do it properly. 但是,我不知道该怎么做。 Could you please advise?
您能否提一些建议?
Look into how callbacks work. 研究回调如何工作。 An example for your function would be
您的功能的一个例子是
var myFunction = function (command, callback) {
// code
ps.on("output", data => {
callback(data)
});
// code
};
myFunction('ls', function (data) {
console.log('The callback data:', data);
});
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