首页<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <style> #father { width: 300px; height: 300px; background-color: pink; margin: 100 auto; } </style> </head> <body> <div id="father"> <div id="son"></div> <div></div> <div></div> </div> <script> let i = document.querySelector(".father") console.log(i); </script> </body> </html>

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <style> #father { width: 300px; height: 300px; background-color: pink; margin: 100 auto; } </style> </head> <body> <div id="father"> <div id="son"></div> <div></div> <div></div> </div> <script> let i = document.querySelector(".father") console.log(i); </script> </body> </html>

时间: 2023-11-16 12:40:39 浏览: 193

根据你提供的代码，你的 HTML 中的 `div` 元素的 `id` 属性为 `father`，而不是 `class` 属性。因此，你应该使用 `querySelector("#father")` 来选择 `id` 为 `father` 的元素，而不是 `querySelector(".father")`。以下是修改后的代码： ```html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <style> #father { width: 300px; height: 300px; background-color: pink; margin: 100 auto; } </style> </head> <body> <div id="father"> <div id="son"></div> <div></div> <div></div> </div> <script> let i = document.querySelector("#father") console.log(i); </script> </body> </html> ``` 现在，变量 `i` 将会指向 `id` 为 `father` 的元素，并且不再是空值。

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