如何循环遍历 HTML 元素

Question

此代码使得当用户单击其中一种颜色 (color1-4) 时，它会设置display所有鞋子的 CSS 属性，none但单击的颜色除外，其display设置为block. 代码看起来很脏，雇主不会批准。我将如何着手制作一个 for 循环，或者以其他方式使代码更清晰？color2.addEventListener('click', () => {    shoe.style.display = "none";    shoe3.style.display = "none";    shoe5.style.display = "none";    shoe2.style.display = "block";    console.log('u removed it and added another');});color3.addEventListener('click', () => {    shoe.style.display = "none";    shoe3.style.display = "none";    shoe5.style.display = "none";    shoe2.style.display = "none";    shoe3.style.display = "block";    console.log('u removed it and added another');});color4.addEventListener('click', () => {    shoe.style.display = "none";    shoe3.style.display = "none";    shoe5.style.display = "none";    shoe3.style.display = "none";    shoe5.style.display = "block";    console.log('u removed it and added another');});color1.addEventListener('click', () => {    shoe.style.display = "block";    shoe2.style.display = "none";    shoe3.style.display = "none";    shoe4.style.display = "none";    shoe5.style.display = "none";    console.log('u removed it and added another');});color2.addEventListener('click', () => {    shoe.style.display = "none";    shoe3.style.display = "none";    shoe5.style.display = "none";    shoe2.style.display = "block";    console.log('u removed it and added another');});

Answer 1

您需要使用 Array 和自定义函数来操作 DOM 元素，这是一个基本示例：

var shoes = [s1,s2,s3]; //DOM element arrays

colorShoe = (shoe) =>{

  for(let i=0; i<shoes.length;i++){

    if(shoes[i] === shoe){

      //Handling style

    }

}

Answer 2

如果你不想使用 array ，你可以这样做。只需使用 window['var name'+the index number] 然后你可以在后面添加你想做的事情 :D 谢谢 :D

color3.addEventListener('click', () => {

        for (var i = 1; i <= 5; i++) {

            if (i == 3) shoe.style.display = "block";

            else {

                window['shoe'+i].style.display = "none";

            }

        }

        console.log('u removed it and added another');

    });

    color4.addEventListener('click', () => {

        for (var i = 1; i <= 5; i++) {

            if (i == 4) shoe.style.display = "block";

            else {

                window['shoe'+i].style.display = "none";

            }

        }

        console.log('u removed it and added another');

    });

    color1.addEventListener('click', () => {

        for (var i = 1; i <= 5; i++) {

            if (i == 1) shoe.style.display = "block";

            else {

                window['shoe'+i].style.display = "none";

            }

        }

        console.log('u removed it and added another');

    });

Answer 3

请检查一下，看看您是否可以像下面这样修改您的代码：

const colorList = [color1, color2, color3]; // you can add more

const shoeList = [shoe1, shoe2, shoe3]; // you can add more

[color1, color2, color3].forEach((color, colorIndex) => {

  color.addEventListener('click', () => {

    shoeList.forEach((shoe, shoeIndex) => {

      if (colorIndex === shoeIndex) {

        shoe.style.display = "block";

      } else {

        shoe.style.display = "none";

      }

    });

  });

});