es6-proxy

//利用 Proxy，可以将读取属性的操作（get） 
var pipe = function (value){
    let funStack = []
    var oproxy = new Proxy({}, {
        get: function(pipeObject, fnName){
            console.log("方法名称----》", fnName, pipeObject, funStack)
            if(fnName === "get"){
                
                return funStack.reduce(function(val, fn){
                    console.log("val--->", val, "fn------->", eval(fn+"("+val+")"), typeof fn)
                    
                    return eval(fn+"("+val+")")
                    // return val
                },value)
            }
            funStack.push(fnName)
            return oproxy
        }
    })
    return oproxy;
}
var double = n => n * 2;
var pow = n => n * n;
var reserveInt = n => n.toString().split("").reverse().join("") | 0;
var num = pipe(3).double.pow.reserveInt.get;
console.log(num)  //63