Day 015

最新推荐文章于 2024-07-15 23:50:35 发布

原创最新推荐文章于 2024-07-15 23:50:35 发布 · 168 阅读

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JavaScript

1、创建新节点
创建一个具体的元素： createElement()
创建一个文本节点：createTextNode()
2、添加、移除、替换、插入
添加：appendChild()
移除：removeChild()
替换：replaceChild()
插入：insertBefore() 在已有的子节点前插入一个新的子节点
3、查找
通过标签名称：getElementsByTagName()
通过元素的Name属性的值：getElementsByName()
通过元素Id：getElementById()

MySQL

CREATE TABLE food(
    id INT PRIMARY KEY NOT NULL UNIQUE AUTO_INCREMENT,
    name VARCHAR(20) NOT NULL,
    company VARCHAR(30) NOT NULL,
    price FLOAT,
    produce_time YEAR,
    validity_time INT,
    address VARCHAR(50)
);

INSERT  INTO  food  
VALUES(NULL,'AA饼干','AA饼干厂', 2.5 ,'2013', 3 ,'北京');

UPDATE food SET address='内蒙古',price=3.2 WHERE name='CC牛奶';

UPDATE food SET validity_time=5 WHERE address='北京';

DELETE FROM food WHERE validity_time < (2017-produce_time);

DELETE FROM food WHERE address='北京';

Java

package test;

public class Day014 {
    public static void main(String[] args) {
        System.out.println("兑换方式如下：");
        int a, b, c, count = 0;
        for (a = 0; a <= 10; a++)
            for (b = 0; b <= 20; b++)
                for (c = 0; c <= 100; c++)
                    if (((a + b + c) == 20) && (10 * a + 5 * b + c == 100)) {
                        System.out.println("10元张数：" + a + ", 5元张数" + b + ", 1元张数：" + c);
                        count++;
                    }
        System.out.println("一共有" + count + "种兑换方法。");
    }
}