
JQuery实现Input失去焦点内容为空时背景变红
<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><title></title><meta charset="utf-8" /><script src="js/jquery-1.8.3.js"&g…
<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><title></title><meta charset="utf-8" /><script src="js/jquery-1.8.3.js"&g…