如何在JavaScript中通过XPATH获取元素？

Question

我有一个非常基本的代码。它只是在单击时更改按钮的样式。使用 getElementById 时效果很好，但我想用 XPATH 的方式。我是 JavaScript 的新手。我做错了什么，我该如何实现？

代码：

<!DOCTYPE html>
<html>
<body>

<p id="demo">Click the button to change the layout of this paragraph</p>

<button onclick="myFunction()">Click Me!</button>

<script>
function myFunction() {
  let x = document.getElementByXpath("//html[1]/body[1]/button[1]");
  x.style.fontSize = "25px"; 
  x.style.color = "red"; 
}
</script>

</body>
</html>

Answer 1

看看document.evaluate()

function getElementByXpath(path) {
  return document.evaluate(path, document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
}

function myFunction() {
  let x = getElementByXpath("//html[1]/body[1]/button[1]");
  x.style.fontSize = "25px"; 
  x.style.color = "red"; 
}

<p id="demo">Click the button to change the layout of this paragraph</p>

<button onclick="myFunction()">Click Me!</button>

如何在JavaScript中通过XPATH获取元素？

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