console

console.log(object [, object, ...])

console.info(object [, object, ...])

console.error(object [, object, ...])

var str = 'hello world';
console.log('--->>>%s', str);

常用格式代码：

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按照教程添加前端

https://developers.google.com/web/fundamentals/codelabs/push-notifications?hl=zh-cn

后端服务使用web-push

需要审核key:

https://console.firebase.google.com/project/test-22de3/settings/cloudmessaging/web:Mzg2N2Q4MzgtNmY5MS00YTAzLTkzYTItMDc2NTczZWJkYmE2?hl=zh-cn

服务端需要能正 …

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注意备份将要安装系统的电脑内容

官网教程：https://support.apple.com/zh-cn/HT201372

• U盘抹掉格式为：Mac OS 扩展（日志式） 重命名为：UM
• 下载镜像High.Sierra.dmg并打开
• 打开 …

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https://tyler.io/so-uh-i-think-catalina-10154-broke-ssh/

方案一

.ssh/config文件添加 ProxyCommand nc %h %p

如：

host vps
hostname xx.xxx.com
user root
ProxyCommand nc %h %p

方案二

brew install openssh

~/.bash_profile 添加: export PATH="/usr/local/sbin:$PATH"

source ~/.bash_profile

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重点：toFixed不是四舍五入

MDN:

toFixed() 方法使用定点表示法来格式化一个数。

Chrome：

console.log((0.005).toFixed(2)) -> 0.01
console.log((0.015).toFixed(2)) -> 0.01
console.log((0.025).toFixed(2)) -> 0.03
console.log((0.035 …

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MDN:

lang 全局属性 参与了元素语言的定义。这个语言是不可编辑元素写入的语言，或者可编辑元素应该写入的语言。标签包含 …

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1. 删除默认英文输入法
   1. 关闭SIP
   2. 打开~/Library/Preferences/com.apple.HIToolbox.plist文件,删除ABC相关内容后重启
2. 修改中文输入入法为shift切换中英文
   1. 使用https://github.com/Eronana/scimex插件修改(需重启)
   2. 可 …

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安装

下载地址：https://dev.mysql.com/downloads/mysql/ - wget https://cdn.mysql.com//Downloads/MySQL-5.7/mysql-server_5.7.21-1ubuntu14.04_amd64.deb-bundle.tar

• tar -xf mysql-server_5.7.21-1ubuntu14.04_amd64.deb-bundle.tar
• sudo apt-get update
• sudo apt-get upgrade
• apt-get install libaio1
• sudo dpkg -i mysql-common_5.7.21-1ubuntu14.04_amd64 …

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L_SHIFT+R_SHIFT+B

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https://stackoverflow.com/questions/11598786/how-to-replace-non-printable-unicode-characters-javascript

most of which are quite printable

https://blog.csdn.net/ranjio_z/article/details/51993040?utm_source=blogxgwz8

http://www.unicode.org/charts/PDF/U2000.pdf

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