使用Javascript選擇嵌套元素

Question

如何選擇嵌套元素

例如

我們有這樣的事情（這是列表頁上看起來LinkedIn搜索人員時等）

<li class="page-list">
      <ol>
            <li class="active">1</li>
            <li><button data-ember-action="" data-ember-action-6289="6289" data-is-animating-click="true">2</button></li>
            <li><button data-ember-action="" data-ember-action-6291="6291">3</button></li>
            <li><button data-ember-action="" data-ember-action-6293="6293">4</button></li>
            <li><button data-ember-action="" data-ember-action-6295="6295">5</button></li>
            <li><button data-ember-action="" data-ember-action-6297="6297">6</button></li>
            <li><button data-ember-action="" data-ember-action-6299="6299">7</button></li>
            <li><button data-ember-action="" data-ember-action-6301="6301">8</button></li>
            <li><button data-ember-action="" data-ember-action-6303="6303">9</button></li>
            <li><button data-ember-action="" data-ember-action-6305="6305">10</button></li>
      </ol>
    </li>

現在，就像這樣，頁面上有多個li元素，但只有一個元素帶有<li class="page-list">

現在，從這個li我想點擊/選擇這個

<button data-ember-action="" data-ember-action-6291="6291">3</button>

它進一步嵌套在<li>

[問題]有人可以幫助我，告訴我如何選擇/點擊這個？ 另外我不能使用data-ember-action因為在data-ember-action-6289中，6289不是固定的和隨機的（對於不同的搜索可能不同），因此當我創建一個腳本來執行操作時，它不會了解data-ember-action中的數字。

Answer 1

一個簡單的querySelector會這樣做：

 console.log(document.querySelector('[data-ember-action-6291="6291"]')) 

 <li class="page-list"> <ol> <li class="active">1</li> <li><button data-ember-action="" data-ember-action-6289="6289" data-is-animating-click="true">2</button></li> <li><button data-ember-action="" data-ember-action-6291="6291">3</button></li> <li><button data-ember-action="" data-ember-action-6293="6293">4</button></li> <li><button data-ember-action="" data-ember-action-6295="6295">5</button></li> <li><button data-ember-action="" data-ember-action-6297="6297">6</button></li> <li><button data-ember-action="" data-ember-action-6299="6299">7</button></li> <li><button data-ember-action="" data-ember-action-6301="6301">8</button></li> <li><button data-ember-action="" data-ember-action-6303="6303">9</button></li> <li><button data-ember-action="" data-ember-action-6305="6305">10</button></li> </ol> </li> 

如果您不能指望data-屬性，那么只需選擇ol的第三個子項：

 console.log( document.querySelector('.page-list li:nth-child(3)') ); 

 <li class="page-list"> <ol> <li class="active">1</li> <li><button data-ember-action="" data-ember-action-6289="6289" data-is-animating-click="true">2</button></li> <li><button data-ember-action="" data-ember-action-6291="6291">3</button></li> <li><button data-ember-action="" data-ember-action-6293="6293">4</button></li> <li><button data-ember-action="" data-ember-action-6295="6295">5</button></li> <li><button data-ember-action="" data-ember-action-6297="6297">6</button></li> <li><button data-ember-action="" data-ember-action-6299="6299">7</button></li> <li><button data-ember-action="" data-ember-action-6301="6301">8</button></li> <li><button data-ember-action="" data-ember-action-6303="6303">9</button></li> <li><button data-ember-action="" data-ember-action-6305="6305">10</button></li> </ol> </li>