scope

问题 I'm having issues with a javascript global variable (called TimeStamp) not being defined onload...at least I think that's the problem. I start with this, defining TimeStamp. $(document).ready(function(){ // AddTest(); var TimeStamp = null; waitForMsg(); }); ...waitForMsg then runs using TimeStamp and updated it on successful completion of the ajax call. At least that's the idea, but at the moment nothing runs because "TimeStamp is not defined"...even though I defined it earlier! (urgh). If I

问题 I have a script of R which takes other scripts of R and manipulates them in such a way, and also executes their code. My script uses some variables (obviously), and when the other scripts use a common variable name, I get in a mess. I wish I could execute the other script like in a capsule, such that the coinciding variables do not affect each other. I have been reading about environments, and have made a lot of trials, but I don't catch their real meaning. Example: script1.txt ___________ i

问题 I have a data frame and I'm trying to run a subset on it. In my data frame, I have a column called "start" and I'm trying to do this: sub <- subset(data,data$start==14) and I correctly get a subset of all the rows where start=14. But, when I do this: for(start in seq(1,20,by=1)) { sub <- subset(data,data$start==start) print(sub) } it does not correctly find the subsets. It just prints the entire data frame. Why is this and how do I fix it? 回答1: You can also specify the environment you're

问题 I have created a simple Jekyll page (processed and hosted by GitHub Pages) with a Liquid counter variable where I loop through some data and dump it out and count the number of items with a given property. For example: Complete Before: {{ complete }} {% for book in books %} Title: {{book.Title}} {% if book.Completed == "true" %} {% increment completed %} {% endif %} {% endfor %} Complete After: {{ complete }} Now I have the same chunk of code on two different pages, but the data in books is

问题 I'm discovering the concept of "objects" in JavaScript. I'm making an RSS Parser, and I have an error (commented). function MyParser (feed_url) { // Construct "use strict"; this.feedUrl = feed_url; this.pubArray = []; if (typeof (this.init_ok) == 'undefined') { MyParser.prototype.parse = function () { "use strict"; var thisObj = this; $.get(this.feedUrl, function (data, textStatus, jqXHR) { if (textStatus == 'success') { var xml = jqXHR.responseXML, //lastBuildDate = new Date($(xml).find(

问题 One function I was working on not too long ago had a structure like so: def function(): class Inner: #class stuff #function stuff Inner is only ever used and needed inside of function , and it isn't returned at the end of the function either. Is it a bad idea to define a local class? I've heard many things about how it's bad for performance since python has to recompile the class every single time the function is run, and since performance is what I'm aiming to achieve with this function I'm

问题 In one module, I have a binding set up for an object. There are two other modules: a testing module and a web module. The web module wants that binding to be in request scope, and the testing module wants that binding to be in singleton scope. Right now, we are just duplicating the entire binding and adding the appropriate scope. Is there a better way to do this? I am looking for a way that I can make the binding itself (it's a ToMethod binding) in the one module, and then just have the

问题 Hello to all this is my first time posting, thought it would be good since im utterly stuck. It was my understanding that switch and If/else statements in PHP do not have variable scope. My issue is I have a CSV file ( a sample one) with about 5 rows of values and I need to get it put into a mySQL DB table( the column headers are represented in my "cases" for my switch statement) BUt anyways I'm parsing the CSV file and checking to make sure that the data is in the column it should be and

问题 How to inject a session scoped bean into another session scoped bean without proxy? @Component @Scope("session") class Foo { @Inject Bar bar; } @Component @Scope("session") class Bar { } It reports error "No matching bean". Though a TARGET_CLASS scope-proxy could resolve this problem, but why do I need a proxy for same scoped beans? 回答1: My guess is - because at the injection point spring doesn't distinguish injected beans depending on the scope of the current bean. It needs a proxy to fetch

问题 I just wanted to confirm a suspicion of mine. I stumbled across an article which recommended using Socket.io in the following fashion: var app = require('express').createServer() var io = require('socket.io').listen(app); app.listen(8080); // Some unrelated stuff io.sockets.on('connection', function (socket) { socket.on('action1', function (data) { // logic for action1 }); socket.on('action2', function (data) { // logic for action2 }); socket.on('disconnect', function(){ // logic for