Abh*_*lvi 5 html javascript xpath dom
我有一个非常基本的代码。它只是更改单击时按钮的样式。使用时效果很好，getElementById但我想这样做XPATH。我是 JavaScript 新手。我做错了什么以及如何实现这一目标？
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>
Ale*_* Yu 13
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>
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