在下面的程序Xcode中,I有什么用途?
for (unsigned short int i=0; i<100; i++) {
NSLog(@"Top iOS Apps %i in App store is - %@ released on - %@",i,appStore100Apps[@"feed"][@"results"][i][@"name"],appStore100Apps[@"feed"][@"results"][i][@"releaseDate"]);
这就是我要犯的错误-
Uncaught Error: Module name "https" has not been loaded yet for context: _. Use require([])
http://requirejs.org/docs/errors.html#notloaded
at makeError (require.js:168)
at Object.localRequire [as require] (require.js:1436)
at requirejs (require.js:1797)
at Dataver
class baseClass{};
class derivedClass : public baseClass{};
baseClass *obj = new derivedClass ; // For simplicity, I amn't providing any-
// class members.
虽然发生了baseClass和derivedClass构造,但derivedClass成员对于obj是不透明的。那么,derivedClass构造有什么用呢?顺便说一句,我知道derivedC
悬而未决的问题。查看Global (gtag.js)片段,我并不真正理解arguments变量的使用。
<!-- Global site tag (gtag.js) - Google Analytics -->
<script async src="https://www.googletagmanager.com/gtag/js?id=GA_TRACKING_ID"></script>
<script>
window.dataLayer = window.dataLayer || [];
function gtag(){d
当我试图更新由"_id“过滤的JS/Node.js中的文档时,以下过滤器都没有工作,其中的值是泛型ObjectId (ObjectId('6365050650c6be6d5d090135')):
{_id : ObjectId(123....7890)}
{_id : ObjectId('123....7890')}
{_id : "ObjectId('123....7890')"}
+ other variantions I came across
对我没什么用。我有ReferenceError: ObjectId is
我有以下代码,它是教程的一部分
import csv as csv
import numpy as np
csv_file_object = csv.reader(open("train.csv", 'rb'))
header = csv_file_object.next()
data = []
for row in csv_file_object:
data.append(row)
data = np.array(data)
代码按预期工作,但我不清楚为什么用变量header在文件上调用.next()。csv_file_object不仍然是整个文件