直接代码分析一波： import java.util.*;
public class Ex12 {
public static void main(String[] args) {
Class c1 = new Double(0).getClass();
Class c2 = new Integer(0).getClass();
Clas
背景属性background-color：red；background-image：url（图片地址）；background-repeat:no-repeat;//repeat-x;repeat-y;repeat是否平铺background-positon:left ;//right center top center bottom展开方式backgroun
背景属性background-color：red；background-image：url（图片地址）；background-repeat:no-repeat;//repeat-x;repeat-y;repeat是否平铺background-positon:left ;//right center top center bottom展开方式backgroun
