18.状态模式

var States = {
        state0 : function(){
            console.log(0)
        },
        state1 : function() {
            console.log(1)
        },
        state2 : function() {
            console.log(2)
        },
        state3 : function() {
            console.log(3)
        }
    }
    var ResultState = (function() {
        function show(result) {
            States['state' + result] && States['state' + result]()
        }
        return {
            show : show
        }
    })()
    ResultState.show(3)

    //  状态模式动作
    var lastAction = ''
    function changeAction(action) {
        if (action == 'jump') {
            // jump
        } else if (action == 'move') {
            // move
        } else {
            // other
        }
        lastAction = action
    }
    var MarryState = function() {
        var _currnetState = {},
        state = {
            jump: function() {
                console.log('jump')
            },
            move: function() {
                console.log('move')
            },
            shoot: function() {
                console.log('shoot')
            },
            squat: function() {
                console.log('squat')
            }
        }
        var changeState = function () {
            var arg = arguments
            _currnetState = {}
            if(arg.length) {
                for (let index = 0; index < arg.length; index++) {
                    const element = arg[index];
                    _currnetState[arg[index]] = true
                }
            }
            return this
        }
        var goes = function () {
            // console.log('one goes')
            for (const i in _currnetState) {
                // console.log(i,_currnetState, _currnetState[i])
                state[i] && state[i]();
            }
            return this
        }
        return {
            change: changeState,
            goes: goes
        }
    }
    MarryState().change('jump','shoot').goes().goes()
    var marry = new MarryState()
    // marry.change('jump','shoot').goes().goes()