摘要：
<!DOCTYPE html> <html> <head> <title>多选框</title> <meta charset="utf-8"> <style> *{margin:20; padding:0;} </style> </head> <body> <ul> <li><input type= 阅读全文
摘要：
<!Doctype html> <html> <head> <meta charset="utf-8"> <style> *{margin:0;padding:0;} #div{width:100px;height:300px;background:green;position:absolute;l 阅读全文