如何修复错误:TypeError:elements.classList 未定义? [英] How to fix error: TypeError: elements.classList is undefined?

问题描述

我正在尝试使用 classList 向具有名为icon"的类的每个元素添加一个名为blackbackdrop"的类.不幸的是它不起作用，因为错误 TypeError: elements.classList is undefined

I'm trying to add a class called "blackbackdrop" to every element that has a class called "icon" using classList. Unfortunately it does not work because of error TypeError: elements.classList is undefined

我正在使用此代码:

function blackBackDropIcon() {
  var elements = document.getElementsByClassName("icon");
  elements.classList.add('blackbackdrop');
}

推荐答案

试试这个

   function blackBackDropIcon() {
        var elements = document.getElementsByClassName("icon");
        for (i = 0; i < elements.length; i++) {
            elements[i].classList.add('blackbackdrop');
        }
    }

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