摘要:
if(""){//false}if(" "){//true中间有一个空格}if("abc"){//true} 阅读全文
摘要:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <title>meun.html</title> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="this is 阅读全文