摘要: <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>js 点击事件</title> <script> function cherk(us){ if(us==''){ alert("请输入用户名") } } fun 阅读全文
posted @ 2019-12-16 23:48 recommencer 阅读(1012) 评论(0) 推荐(0)