怎么个欸两个function合并成一个
var imgs = ['1.jpg', '2.jpg','3.jpg'];

// 显示图片的数量
var imgCount = 1;
var index = 0;
function rightClick(){
    
    index -= imgCount;
    
    
    if(index < 0)
    {
        index = 0;
        return;
    
    }
    document.getElementById("img1").setAttribute('src', imgs[(index)%3]);
    document.getElementById("img2").setAttribute('src', imgs[(index + 1)%3]);
    document.getElementById("img3").setAttribute('src', imgs[(index+2)%3]);
}
function leftClick(){
    index += imgCount;
    if(index > imgs.length){
        index = imgs.length;
        return;
    }
    document.getElementById("img1").setAttribute('src', imgs[(index)%3]);
    document.getElementById("img2").setAttribute('src', imgs[(index +1)%3]);
    document.getElementById("img3").setAttribute('src', imgs[(index+2)%3]);
    
}