小编Jap*_*boy的帖子

function doSomethingWith(param)
{
    document.body.addEventListener(
        'scroll',
        function()
        {
            document.write(param);
        },
        false
    ); // An event that I want to remove later
}
setTimeout(
    function()
    {
        document.body.removeEventListener('scroll', HANDLER ,false);
            // What HANDLER should I specify to remove the anonymous handler above?
    },
    3000
);
doSomethingWith('Test. ');

我正在学习Python.希望有人指出我正确的方式.
这就是我想在下面做的事情:

def decorate(function):
    def wrap_function(*args, **kwargs):
        str = 'Hello!'  # This is what I want
        return function(*args, **kwargs)
    return wrap_function

@decorate
def print_message():
    # I'd like to pass 'str' as mentioned above
    # to any functions' argument like below:
    print(str)  # 'str' is same as above

任何的想法？提前致谢.

我目前正在编写JavaScript并且对回调感到困惑.我发现它不是那种内置函数...
我现在正在阅读O'Relly JavaScript第5版,它显示的示例代码如下所示:

getText = function(url, callback) // How can I use this callback?
{
    var request = new XMLHttpRequest();
    request.onreadystatechange = function()
    {
        if (request.readyState == 4 && request.status == 200)
        {
            callback(request.responseText); // Another callback here
        }
    }
    request.open('GET', url);
    request.send();
}

基本上,我想我不明白一般的想法callback......有人可以写一个示例代码来利用callback上述优势吗？

我是JavaScript编程的新手.我现在正在处理我的Google Chrome扩展程序.这是不起作用的代码......:P

我希望getURLInfo函数返回其JSON对象,并希望将其放入resp.有人可以修改我的代码让它工作吗？

function getURLInfo(url)
{
    var xhr = new XMLHttpRequest();
    xhr.open
        (
            "GET",
            "http://RESTfulAPI/info.json?url="
                + escape(url),
            true
        );
    xhr.send();
    xhr.onreadystatechange = function()
    {
        if (xhr.readyState == 4)
        {
            return JSON.parse(xhr.responseText);
        }
    }
}
var resp = getURLInfo("http://example.com/") // resp always returns undefined...

提前致谢.

我正在使用谷歌Chrome 10并编写JavaScript来检测滚动结束.

要检测滚动结束window,下面的代码工作正常:

window.addEventListener(
    'scroll',
    function()
    {
        var scrollTop = document.documentElement.scrollTop ||
            document.body.scrollTop;
        var offerHeight = document.body.offsetHeight;
        var clientHeight = document.documentElement.clientHeight;
        if (offsetHeight <= scrollTop + clientHeight)
        {
            // Scroll end detected
        }
    },
    false
);

现在我想检测指定元素的滚动结束,例如<section id="box" style="height: 500px; overflow: auto;">
这是无法正确检测的代码:

document.getElementById('box').addEventListener(
    'scroll',
    function()
    {
        var scrollTop = document.getElementById('box').scrollTop;
        var offerHeight = document.getElementById('box').offsetHeight;
        var clientHeight = document.getElementById('box').clientHeight;
        if (offsetHeight <= scrollTop + clientHeight)
        {
            // This is called before scroll end!
        }
    },
    false
); …

我现在正在尝试使用Browserify,我遇到了问题.

我总是使用Backbone和Lodash而不是Underscore,所以我为Browserify写了一些shim脚本:

shims/lodash.js:

'use strict';
/* global window,require,module */
require('../vendor/lodash.underscore-1.2.0');
module.exports = window._;

shims/backbone.js:

'use strict';
/* global window,require,module */
require('../vendor/backbone-1.0.0');
module.exports = window.Backbone;

app.coffee:

'use strict'
$ = require './shims/jquery'
_ = require './shims/underscore'
Backbone = require './shims/backbone'

我实际上grunt-coffeeify用来构建Browserify模块,它在下面说错误:

Running "coffeeify:source" (coffeeify) task
Warning: module "underscore" not found from "/Users/User/proj/src/js/vendor/backbone-1.0.0.js" Use --force to continue.

我应该更改什么才能正常工作Backbone？提前致谢.

UPDATE

不知何故,它适用于以下代码:

shims/lodash.js:

'use strict';
/* global require,module */
module.exports = require('../vendor/lodash-1.2.0');

shims/backbone.js:

'use strict';
/* global …

我现在将我的小型Google App Engine应用程序迁移到Heroku平台.我实际上并没有使用Bigtable,并且webapp2大大降低了我的迁移成本.

现在我一直坚持处理静态文件.

有没有好的做法？如果是的话,请带我到那里.

提前致谢.

编辑

好吧,我现在正在使用paste我的WSGI服务器.而且paste.StaticURLParser()应该是什么我需要实现静态文件处理程序.但是我不知道如何将它与它集成webapp2.WSGIApplication().谁能帮助我？

也许我需要覆盖webapp2.RequestHandler类才能paste.StaticURLParser()正确加载;

import os
import webapp2
from paste import httpserver

class StaticFileHandler(webapp2.RequestHandler):
    u"""Static file handler"""

    def __init__(self):
        # I guess I need to override something here to load
        # `paste.StaticURLParser()` properly.
        pass

app = webapp2.WSGIApplication([(r'/static', StaticFileHandler)], debug=True)


def main():
    port = int(os.environ.get('PORT', 5000))
    httpserver.serve(app, host='0.0.0.0', port=port)

if __name__ == '__main__':
    main()

任何帮助将不胜感激!