Mongodb update array $pull modifier

1. $pull modifier deletes qualifying elements from the array in the following format: { $pull: { <field1>: <value|condition>, <field2>: <value|condition>, ... } } 2. Specify a value to delete all lists Give a document under a stores collection { _id: 1, fruits: [ "apples", "pears", "oranges", "grapes", "bana ...

Posted on Mon, 20 Jul 2020 10:53:53 -0400 by maniac1aw

JQuery Source Understanding (1)

When you look at the JQuery source code, you can use StackOverFlow to search for answers to related questions and often find satisfactory answers quickly. 1. Extend JQuery to a global object Extend JQuery to a global object so that you can use $directly in your js code to represent JQuery. // Expose jQuery to the glo ...

Posted on Mon, 20 Jul 2020 10:47:40 -0400 by stvs

JQuery Source Understanding (1)

When you look at the JQuery source code, you can use StackOverFlow to search for answers to related questions and often find satisfactory answers quickly. 1. Extend JQuery to a global object Extend JQuery to a global object so that you can use $directly in your js code to represent JQuery. // Expose jQuery to the glo ...

Posted on Mon, 20 Jul 2020 10:47:48 -0400 by Sergeant

android system camera returns picture (original)

Jurisdiction <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"></uses-permission> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></u ...

Posted on Mon, 20 Jul 2020 10:33:36 -0400 by Arya

When ajax parses json data, date appears in seconds (1511352532000)

1. Description of the problem: When parsing json data through ajax on a jsp page, it is found that date-type data is displayed in seconds, similar to 1511352532000. 2. Analysis: The format 1511352532000 is a millisecond format for date-type data, which means that it is a problem with the display format of the data, because the background ...

Posted on Sun, 19 Jul 2020 12:23:03 -0400 by taskhill

Linux remote SSH uses certificate-secured login (what do you do-zgbn)

Linux Remote SSH Using Certificate Secure Login Server: Ali Cloud Server Operating System: CentOS 7 (Linux) Remote client: Xshell5 (SSH certificate) Logged in user: root Create public and private keys on the server side Log in to the system using the root user and be in the default directory for the current root ...

Posted on Sun, 19 Jul 2020 12:17:54 -0400 by romilbm

Kids learn Java (6): encapsulation

Object oriented has three characteristics: Encapsulation, Inheritance and Polymorphism. This section covers encapsulation. Procedure 1 class Woman { private String name; private int age; private Man husband; public void setName(String name) { this.name = name; } public String getName() { return ...

Posted on Sun, 19 Jul 2020 11:51:29 -0400 by kael.shipman

Android: East East Record of Multiuser UserHandle

Waste paper.png Android's multiuser has something called UserHandle, which is related to multiuser.Now record it. 1. Look at each process root 3051 2 0 0 rescuer_th 0000000000 S kbase_event system 3138 522 2002840 89588 SyS_epoll_ 70add58a60 S com.hehe.usbselection u0_a23 3342 523 1475732 94212 SyS_epoll_ ...

Posted on Sun, 19 Jul 2020 11:42:50 -0400 by voltrader

References in Java and JNI (strong, soft, weak, virtual)

1. Strong References (Objects) Features: Strong references provide direct access to the target object. Will not be recycled. Two, soft reference (SoftReference class) Features: When GC reclaims based on JVM memory, JVM reclaims when it finds it is out of memory Conditions for freeing up space: JVM found insufficient m ...

Posted on Sun, 19 Jul 2020 11:33:27 -0400 by amitkrathi

References in Java and JNI (strong, soft, weak, virtual)

1. Strong References (Objects) Features: Strong references provide direct access to the target object. Will not be recycled. Two, soft reference (SoftReference class) Features: When GC reclaims based on JVM memory, JVM reclaims when it finds it is out of memory Conditions for freeing up space: JVM found insufficient m ...

Posted on Sun, 19 Jul 2020 11:35:19 -0400 by Mikersson