柯里化

var increase = function(){

var arr = []

return function(){

if(arguments.length == 0){

let noParamNum = arr.reduce((prev,cur)=>{

return prev+cur

},0)

console.log(noParamNum)

}else{

[].push.apply(arr,arguments)

let paramNum = arr.reduce((prev,cur)=>{

return prev+cur

},0)

console.log(paramNum)

}

}

}()