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用矩阵管理成绩表 - App Inventor 2 矩阵块入门案例 · App Inventor 2 中文网
...：把成绩表装进矩阵
第 2 关：查任意一格的成绩
第 3 关：改成绩（原地修改）
第 4 关：算某一行（某名学生）的平均分
第 5 关：整表转置，横过来看
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How to check if remote branch exists on a given remote repository?
...h-name
In case branch-name is found you will get the following output:
b523c9000c4df1afbd8371324083fef218669108 refs/heads/branch-name
Otherwise no output will be sent.
So piping it to wc will give you 1 or 0:
$ git ls-remote --heads git@github.com:user/repo.git branch-name | wc -l
Alterna...
JoeDevCamera 扩展：在布局中显示相机预览，程序控制拍照与录像 · App Inventor 2 中文网
...本信息
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宽高比 9:16
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启动相机并拍照
录制视频（一个按钮切...
How should I validate an e-mail address?
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32 Answers
32
Active
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How to 'minify' Javascript code
.../shorter
var a=10;
a+='';//String
a*=1;//Number
Round a number
var a=10.3899845
var b=Math.round(a);
//same as
var b=(a+.5)|0;//numbers up to 10 decimal digits (32bit)
Floor a number
var a=10.3899845
var b=Math.floor(a);
//same as
var b=a|0;//numbers up to 10 decimal digits (32bit)
switch ca...
event.preventDefault() vs. return false
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13 Answers
13
Active
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How to get the difference between two arrays of objects in JavaScript
...g only native JS, something like this will work:
a = [{ value:"4a55eff3-1e0d-4a81-9105-3ddd7521d642", display:"Jamsheer"}, { value:"644838b3-604d-4899-8b78-09e4799f586f", display:"Muhammed"}, { value:"b6ee537a-375c-45bd-b9d4-4dd84a75041d", display:"Ravi"}, { value:"e97339e1-939d-47ab-974c-1b68c...
Remove all special characters, punctuation and spaces from string
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378
This can be done without regex:
>>> string = "Special $#! characters spaces 888323...