<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
Try adding this to the <head>
tag in your html file.
(尝试将其添加到html文件的<head>
标记中。)
Javascript does not support the $
operator without also using the jQuery api.
(如果不同时使用jQuery API,则Javascript不支持$
运算符。)
The code i just gave you to place in your <head>
tag is a link to the google cdn for the jQuery library.(我刚刚给您放置在<head>
标记中的代码是指向jQuery库的google cdn的链接。)
This will make it so the $
operator should work.(这样就可以使$
运算符起作用。)
give it a try.(试试看。)
You say the error is on your lambda expression but i'm afraid that i do not have too much knowledge on that front.
(您说错误在您的lambda表达式上,但是我在那方面恐怕没有太多知识。)
Please let me know if this solution worked, otherwise you will have to take a deeper look into lambda expressions.(请让我知道该解决方案是否有效,否则您将不得不更深入地研究lambda表达式。)
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