摘要：
<!DOCTYPE html><html><head><meta charset="UTF-8"><title>Insert title here</title><style type="text/css"> .ok{color: green;} .error{color: red;} </styl 阅读全文
摘要：
<!DOCTYPE html><html><head><meta charset="UTF-8"><title>Insert title here</title><script type="text/javascript">//Number var n=3.1415926; console.log( 阅读全文