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*单例模式不能通过 new 类名(); 来实例化对象class Person{ private static $interion; private $pop = array(); private function __construct(){} public function getInterion... 阅读全文
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left join #左连接又叫外连接 left join 返回左表中所有记录和右表中连接字段相等的记录test_user表phpcvs表SQL: select * from test_user left join phpcvs on test_user.id=phpcvs.id执行结果如下图:... 阅读全文
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jq-1 info dataType的类型ajax是向服务器请求数据No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not ... 阅读全文