javascript - querySelectorAll 不适用于伪类 nth-last-child

Question

我有这个 javascript 代码:

var fieldsets = document.querySelectorAll('fieldset:nth-last-child("-n+2")');
console.log('fieldsets' + fieldsets);

我有 4 个字段集

我在 chrome 检查器中收到此错误:

Uncaught SyntaxError: Failed to execute 'querySelectorAll' on 'Document': 'fieldset:nth-last-child("-n+2")' is not a valid selector. 

希望有人能帮忙! 谢谢 :)!

Answer 1

您不需要在参数表达式周围加上引号。

var fieldsets = document.querySelectorAll('fieldset:nth-last-child(-n+2)');