JS代理模式

class ReadImg{
    constructor(fileName){
        this.fileName = fileName
        this.loadFromDisk()
    }
    display(){
        console.log("display..............."+this.fileName)
    }
    loadFromDisk(){
        console.log("loading............."+this.fileName)
    }
}

class ProxyImg{
    constructor(fileName){
        this.readImg = new ReadImg(fileName)
    }
    display(){
        this.readImg.display()
    }
}

let proxyzImg = new ProxyImg('1.png')
proxyzImg.display()