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使用虚拟现实和App Inventor进行实验 · App Inventor 2 中文网
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该项目是麻省理工学院 App Inventor 2011 年 Google Summer of Code 活动的一部分。它描述了使用 Google Cardboard SDK 为 App Inventor 添加虚拟功能的实验。有两个演示项目可以作为未来实验的基础。
简介
人们对虚拟现实 (VR) 和增强现实 (A...
final keyword in method parameters [duplicate]
I often encounter methods which look like the following:
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The object 'DF__*' is dependent on column '*' - Changing int to double
...ing_default;
ALTER TABLE Movie ALTER COLUMN rating DECIMAL(2) NOT NULL;
-- sets up a new default constraint with easy to remember name
ALTER TABLE Movie ADD CONSTRAINT rating_default DEFAULT ((1.0)) FOR rating;
You can combine those last 2 statements so you alter the column and name the constraint...
SVN checkout ignore folder
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Then to get the contents of 'bar' down:
$ cd bar && svn update --set-depth infinity
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@synthesize vs @dynamic, what are the differences?
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@synthesize will generate getter and setter methods for your property.
@dynamic just tells the compiler that the getter and setter methods are implemented not by the class itself but somewhere else (like the superclass or will be provided at runtime).
Uses for ...
How to overwrite the previous print to stdout in python?
If I had the following code:
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Are unused CSS images downloaded?
... }
</style>
</head>
<body>
<?php if(isset($_GET['foo'])) {
file_put_contents('test.txt', $_SERVER['HTTP_USER_AGENT']);
} ?>
</body>
</html>
If test.txt is populated with the browser's user agent, then the image is downloaded. This was not...
Using Gulp to Concatenate and Uglify files
...d gulp-concat both work nicely with gulp-sourcemaps now. Just make sure to set the newLine option correctly for gulp-concat; I recommend \n;.
Original Answer (Dec 2014): Use gulp-uglifyjs instead. gulp-concat isn't necessarily safe; it needs to handle trailing semi-colons correctly. gulp-uglify a...
What is the default access modifier in Java? [duplicate]
What is the default access modifier for a method or an instance variable if I do not state it explicitly?
13 Answers
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Why does document.querySelectorAll return a StaticNodeList rather than a real Array?
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Yeah, like Kev said: qSA resultset is static, getElementsByTagName() resultset is dynamic.
– joonas.fi
Jul 23 '15 at 12:35
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