摘要:
高级查询: 1.连接查询 select * from Info,Nation #得出的结果称为笛卡尔积select * from Info,Nation where Info.Nation = Nation.Code join on连接 select * from Info join Nation 阅读全文
摘要:
1、Window.document对象 一、找到元素: docunment.getElementById("id");根据id找,最多找一个; var a =docunment.getElementById("id");将找到的元素放在变量中; docunment.getElementByName( 阅读全文