Javascript |如何使用类名

问题描述 投票:0回答:1
打印第二个元素

如何使用类名“ nameAnswer”打印第二个元素。它说:undefined为什么?

HTML:

<h1 class="nameAnswer" value="dog"></h1>
<h1 class="nameAnswer" value="cat"></h1>
<h1 class="nameAnswer" value="fish"></h1>

JAVASCRIPT:

var count = document.getElementsByClassName("nameAnswer").length;
if(count>1){
var answ = document.getElementsByClassName('nameAnswer'[2]).value;
alert(answ);
}
javascript
1个回答
0
投票

尝试此方法

var count = document.getElementsByClassName("nameAnswer").length;
if(count>1){
  var answ = count[2].value;
  alert(answ);
}

0
投票

您需要在括号后面加上[2]。或只是执行以下操作:

var nameAnswers = document.getElementsByClassName("nameAnswer");
var count = nameAnswers.length;
if(count > 1){
    var answer = nameAnswers[2].value;
    alert(answer);
}

0
投票

尝试一下:

const val = document.querySelector('.nameAnswer:nth-child(2)').getAttribute('value')

console.log(val)
<h1 class="nameAnswer" value="dog"></h1>
<h1 class="nameAnswer" value="cat"></h1>
<h1 class="nameAnswer" value="fish"></h1>
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