Javascript 如何查询SVG元素并获取其标题？

我有以下标记，其中顶级元素包含带有标题检查图标的标记：

<div data-testid="monday" role="button">
  <svg viewBox="0 0 24 24">
    <title>Check Icon</title>
    <path d="M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z"></path>
  </svg>
  <span>Monday</span>
</div>

---

使用querySelector，您还可以使用CSS选择器语法请求包含的标记：

var buttonElement = document.querySelector('[data-testid="monday"]');

// select the title element in the svg element as direct child nodes,
// if you need to be so specific:
// var titleElement1 = document.querySelector('[data-testid="monday"] > svg > title');

// or just select any title in the test object: 
var titleElement = document.querySelector('[data-testid="monday"] title');

// get the text of the title by:
alert (titleElement.textContent);

---

使用querySelector，您还可以使用CSS选择器语法请求包含的标记：

var buttonElement = document.querySelector('[data-testid="monday"]');

// select the title element in the svg element as direct child nodes,
// if you need to be so specific:
// var titleElement1 = document.querySelector('[data-testid="monday"] > svg > title');

// or just select any title in the test object: 
var titleElement = document.querySelector('[data-testid="monday"] title');

// get the text of the title by:
alert (titleElement.textContent);