var sys = require('sys');
var exec = require('child_process').exec;
var cmd = 'whoami';
var child = exec( cmd,
function (error, stdout, stderr)
{
var username=stdout.replace('\r\n','');
}
);
var username = ?
如何从exec函数外部找到用户名?
发布于 2013-10-18 14:29:15
您可以向exec函数传递回调。当exec函数确定用户名时,您将使用该用户名调用回调。
var child = exec(cmd, function(error, stdout, stderr, callback) {
var username = stdout.replace('\r\n','');
callback( username );
});
由于JavaScript的异步特性,您不能这样做:
var username;
var child = exec(cmd, function(error, stdout, stderr, callback) {
username = stdout.replace('\r\n','');
});
child();
console.log( username );
这是因为行console.log( username );
不会等到上面的函数完成。
回调说明:
var getUserName = function( callback ) {
// get the username somehow
var username = "Foo";
callback( username );
};
var saveUserInDatabase = function( username ) {
console.log("User: " + username + " is saved successfully.")
};
getUserName( saveUserInDatabase ); // User: Foo is saved successfully.
发布于 2013-10-18 15:25:33
您可以在具有回调的函数中编写"exec“语句...像这样
var sys = require('sys');
var exec = require('child_process').exec;
var cmd = 'whoami';
function execChild(callback){
var child = exec( cmd,
function (error, stdout, stderr)
{
username=stdout.replace('\r\n','');
callback(username);
}
)};
execChild(function(username){
console.log(username);
});
https://stackoverflow.com/questions/19442829
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