http_proxy switch functions

.bash_profile

function proxy_off(){
    unset http_proxy
    unset https_proxy
    brew services stop polipo
    echo -e "已关闭代理"
}

function proxy_on() {
    export no_proxy="localhost,127.0.0.1,localaddress,.localdomain.com"
    export http_proxy="http://127.0.0.1:8123"
    export https_proxy=$http_proxy
    brew services start polipo
    echo -e "已开启代理"
}