# 프로토타입 함수

## 프로토타입 함수

> function 함수명 (매개변수1, 매개변수2, .....){\
>     this.속성명 = 새 값;\
> }
>
> 함수명 prototype.함수명 = function(){\
>     자바스크립트 코드;\
> }
>
> let 참조변수 (인스턴스 네임) = new 함수명 ();

## 샘플 1

```javascript
function func7(num1, str1, str2){
    this.youNum = num1;
    this.youStr1 = str1;
    this.youStr2 = str2;
}
func7.prototype.result = function(){
    let str = "";
        str += this.youNum + ". ";
        str += this.youStr1 + "가 ";
        str += this.youStr2 + "되었습니다.";
        return str;
}
let javas = new func7(7, "함수", "실행");
document.write(javas.result());

//7. 함수가 실행되었습니다.
```

## 샘플 2

```javascript
function CheckWeight(name, height, weight){
    this.userName = name;
    this.userHeight = height;
    this.userWeight = weight;
    this.minWeight;
    this.maxWeight;
}
CheckWeight.prototype.getInfo = function(){
    let str = "";
    str +="이름:" + this.userName + ", ";
    str +="키:" + this.userHeight + ", ";
    str +="몸무게:" + this.userWeight + ", ";
    return str;
}
CheckWeight.prototype.getResult = function(){
    this.minWeight = (this.userHeight - 100) * 0.9 - 5;
    this.maxWeight = (this.userHeight - 100) * 0.9 + 5;

    if ( this.userHeight >= this.minWeight && this.userWeight < this.maxWeight ){
        return "정상 몸무게입니다.";
    } else if( this.userWeight < this.minWeight) {
        return "정상 몸무게보다 미달입니다.";
    } else{
        return "정상 몸무게보다 초과입니다.";
    }
}

let hwang = new CheckWeight("장아름","158","50");
document.write(hwang.getInfo());
document.write(hwang.getResult());
//이름:장아름, 키:158, 몸무게:50, 정상 몸무게입니다.
```


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