使用原型链 或者class 实现一个计算器完成链式调用

1.使用class类

class myCalculator{
    constructor(value){
        this.value = value
    }
    add(newValue){
        this.value = this.value + newValue
        return this
    }
    reduction(newValue){
        this.value = this.value - newValue
        return this
    }
    take(newValue){
        this.value = this.value * newValue
        return this
    }
    division(newValue){
        this.value = this.value / newValue
        return this
    }
}
var num = new myCalculator(1)
var a = num.add(2).reduction(2).take(5).division(2)
console.log(a);

2.使用原型链

function myCalculator(num){
    this.num = num;
}
myCalculator.prototype.add = function(newNum){
    this.num = this.num + newNum
    return this
}
myCalculator.prototype.redu = function(newNum){
    this.num = this.num - newNum
    return this
}
myCalculator.prototype.take = function(newNum){
    this.num = this.num * newNum
    return this
}
myCalculator.prototype.division = function(newNum){
    this.num = this.num / newNum
    return this
}
var sum = new myCalculator(5);
sum.add(2).redu(3).take(3).division(3)
console.log(sum)  //打印4