摘要:
e:first-child , e:nth-child就是选择第几个e的意思 <!DOCTYPE html> <html lang="zh-cn"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="I 阅读全文
摘要:
input输入框在鼠标选中时边框会变化 就是外边框outline 设置outline:0;或者outline:none;即可取消 <!DOCTYPE html> <html lang="zn-cn"> <head> <meta charset="UTF-8"> <meta http-equiv="X 阅读全文