let PromiseStructure = {

        promiseState:{ //存储数据及状态
            status:'',
            value:''
        },

        sealed:boolean, //Promise是否已有状态，有的话就封锁

        next:[
            // then/catch节点
        ]

        then,

        catch
    }

     let then/catch节点 = {

        fn,   //处理函数

        next:[
            // then/catch节点
        ],

        type, //表明是处理then/catch的函数

        then, //链式API

        catch //链式API
    }