我在 h3 标签中存储了一些名字,当我按下一个按钮时,我希望它们一次只突出显示一个,然后停在一个随机的名字上。
<div class="all-names">
<h3 class="name-one"><span class="line">Name One</span></h3>
<h3 class="name-two">Name2</h3>
<h3 class="name-three">Name3</h3>
<h3 class="name-four">Name4</h3>
<h3 class="name-five">Name5</h3>
<h3 class="name-six">Name6</h3>
<h3 class="name-seven">Name7</h3>
<h3 class="name-eight">Name8</h3>
<h3 class="name-nine">Name9 <span class="arrow"></span></h3>
</div>
姓名one如果不是星期一必须划掉,如果不是星期一也不会高亮
const nameOne = document.querySelector(".name-one")
const goBtn = document.querySelector(".btn")
let allNames = document.querySelector(".all-names")
const isOne = document.querySelector(".answer")
const date=new Date();
const isMonday = date.getDay();
if(isMonday === 1) {
setTimeout(() => {
isOne.textContent = 'yes'
}, 600);
} else {
setTimeout(() => {
isOne.textContent = 'no'
}, 600);
let nameArray = []
goBtn.onclick = function() {
const elements = document.getElementsByTagName("h3")
for (i=0; i < elements.length; i++) {
teamArray.push(elements[i])
// let noNameOne = nameArray.shift() //i would like to remove nameOne whenever it is not a monday;
let randomName = Math.floor(Math.random() * nameArray.length)
nameArray[randomName].style.backgroundColor= "white"
nameArray.forEach(randomName => {
nameArray[randomName].style.backgroundColor= "none"
});
}
}
现在的代码,它会产生控制台错误:
TypeError: Cannot read properties of undefined (reading 'style')
at app.js:44:35
at Array.forEach (<anonymous>)
at goBtn.onclick (app.js:43:19)
(
如果我删除 forEach 位,当我按下按钮时,它将突出显示几个随机名称。所以问题是这些: