选项卡效果

    let left = this.document.querySelectorAll(".left li");  //左侧
    let right = this.document.querySelectorAll(".right");  //右侧
console.log(left);

console.log(right);
    for (let j = 0; j < left.length; j++) {
        left[j].addEventListener("click", function () {
            for (let i = 0; i < right.length; i++) {
                right[i].style.display = "none"
            }
            
                right[j].style.display = "block"
           
        })
    }

}