console 命令行工具 X clear
console
<html>
    <body>
        <button id="button">按我</button>
    </body>
    <script>
        var MacroCommand = function(){
            return {
                commandsList:[],
                add:function( command ) {
                    this.commandsList.push( command );
                },
                execute: function(){
                    for( var i=0,command; command = this.commandsList[i++];) {
                        command.execute();
                    }
                }
            };
        }
        var openAcCommand = {
            execute: function(){
                console.log('打开空调'');
            }
        }
    </script>
</html>