1、安装package control插件；
2、安装markdown preview插件；
3、在preference选择key binding user，输入
{ "keys": ["alt+m"], "command": "markdown_preview", "args": { "target": "browser"} },{ "keys": ["alt+v"], "command": "markdown_preview", "args": { "target": "save"} },{ "keys": ["alt+c"], "command": "markdown_preview", "args": { "target": "clipboard"} }
