myvyang

1. 只有函数有 prototype 属性。默认情况下，func.ptototype = {constructor: func} ，即 func.ptototype.constructor == func
2. 任何对象都有 __proto__ 属性，指向自己的 [[Prototype]] ，即原型链的上一层
3. 例如，var c = new func() ，则 c.__proto__ === func.ptototype 
4. 如果 var c = 1 ，约等于 var c = Number(1) ，因此 c.__proto__ === Number.prototype 
5. 可以看到 x.__proto__ 永远都不会是一个函数，但是永远都会是某个 func.prototype

myvyang

certificate verify failed: unable to get local issuer certificate

sudo /Applications/Python\ 3.8/Install\ Certificates.command

myvyang

echo "rdr pass proto tcp from any to any port {9111} -> 127.0.0.1 port 5555" | sudo pfctl -Ef -
sudo pfctl -s nat    



编辑
sudo vim /etc/pf.anchors/custom


清理：

myvyang

设置VPN服务器 https://jonsview.com/how-to-setup-os-x-10-9-as-a-l2tp-vpn-server-without-apples-server-app
设置自动开机 sudo pmset autorestart 1

myvyang

adb shell pm list packages
adb shell pm clear com.package.app
adb uninstall com.package.app
adb install -t debug.apk

myvyang

1. 如果判断一个元素是否在DOM中可见？

return (el.offsetParent === null)

见 https://stackoverflow.com/questions/19669786/check-if-element-is-visible-in-dom

myvyang

[global]
index-url=https://pypi.tuna.tsinghua.edu.cn/simple
trusted-host=pypi.tuna.tsinghua.edu.cn
disable-pip-version-check=true
timeout=30

myvyang

cd "$(brew --repo)"
git remote set-url origin https://mirrors.ustc.edu.cn/brew.git

cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core"
git remote set-url origin https://mirrors.ustc.edu.cn/homebrew-core.git

echo 'export HOMEBREW_BOTTLE_DOMAIN=https://mirrors.ustc.edu.cn/homebrew-bottles' >> ~/.zshrc
source ~/.zshrc

npm config set registry http://registry.npm.taobao.org/

myvyang

def json_structure(j):
    """
        JSON有三种结构：字面值(int, bool, str), dict, list
        为简化处理，将list通过转换视为dict结构，key为序号。
            ["a", 1] -> {"0": "a", "1": 1}

        这个函数返回json的结构信息，"值"会被丢弃。
        {"a": 1, "b": ["n", false]}
            ->

myvyang

REQ: GET /api/v1/object/{number}/property
REQ: POST /api/v1/object/{number}/action
       {"xx": "xx"}

RES: {
        "code": 0/1/-1,
        "msg": "",
        "resp": {
        }