function today(time) {
    var date = time || new Date()
    var year = date.getFullYear()
    var month = (date.getMonth() + 1) < 10 ? ("0" + (date.getMonth() + 1)) : date.getMonth() + 1
    var day = date.getDate() < 10 ? ("0" + date.getDate()) : date.getDate()
    return (year + "" + month + "" + day)
}
today()
// "20180410"
today(new Date())
// "20180410"
英文书信的格式
 For a one minute self-introduction it is very important to be clear and concise. People tend to switch off very early on in a conversation if you spend too much time on one point. Start by introducing your name, where you are from, what you are doing, and then move onto what is relevant to the conversation. If you are introducing yourself in a work environment, you then need to talk about your vocational role, however if you are talking in a social context, you should talk about your hobbies and interests and less about your career.希望能帮助到你，望采纳！！！...
求一篇雅思写作范文
 你好，我是世纪雅思学生，我问我们老师，一下是我的老师给回答的：In present-day society, plastic containers and utensils are extensively used in big cities and the countryside alike. They are so common-place and I would hazard the guess that each one of us has seen, at one time or another, the unsightly scene of plastic bags swirling in the wind. These plastic shopping bags, chopsticks, to-go boxes and mineral-water bottles, to name but a few, when not properly disposed of, create a colossal amount of non-biodegradable refuse. Therefore, some people argue that we have embarked upon a “throw-away” era when plastic rubbish is largely dumped indiscriminately and irresponsibly (this act is often labeled “white pollution” on account of the color of plastic wastes). Personally, I wholeheartedly support their view. There are numerous reasons for this worrisome phenomenon coming into being. To begin with, at present the bulk of people who shop and/or eat out regularly are still poorly-informed, uninformed or misinformed about the pernicious influence that non-biodegradable pollutants exert on the ecosystem, which is the main culprit in the global-scale mishandling of the plastic wastes. The chief component of such trash is polythene, which cannot decompose on landfill sites over the process of the next hundreds of years if no major scientific breakthrough comes along in polythene treatment. Thus, such trash must be dealt with collectively rather than be scattered like tumbleweeds. Secondly, the proliferation of plastic shopping bags and eating ware is largely fuelled by the surging, headlong consumerism. Plastic containers and utensils are lighter in weight, cheaper (often free of charge) in price and water-proof in performance. These superior properties make them preferable to their paper and cloth counterparts in customers' eyes; and as consumer satisfaction reigns supreme in contemporary society, compared with superb portability, affordability and utility, how to dispose of them is the last thing the customers are concerned about. Additionally, plastic bags, wrap and containers are also commercially feasible since they are cheaper to manufacture, ship and store. These mercenary considerations also have prompted the good old cloth or paper bags to be supplanted by plastic bags but over the phasing-out process, few stores and restaurants advocate or encourage the use of environmentally-benign disposal of plastic trash, hence the whole slew of non-biodegradable garbage and environmental hazards ensue. Given the scale and severity of “white pollution”, we must take immediate steps to address this scourge. In the first place, we must do our utmost to enhance people's awareness of how persistent and devastating non-biodegradable trash can be to our environment and our posterity's. Secondly, retail stores and dining establishments should spare no effort in encouraging their customers to reuse plastic packing items. Furthermore, indiscriminate and irresponsible dumping of household garbage or personal junk should be outlawed by the legislature and heavy fines or even jail terms must be imposed on those compulsive litterbugs who fail to get their act together. Then, on the part of the biochemical researchers and technologists, scientific research must be launched here and now in pursuit of effectual ways to convert non-biodegradable refuse to biodegradable refuse. Last but not least, the government must not shirk its obligations in mobilizing scientific resources and rallying popular support in the crusade against “white pollution”. Neither should pay just lip service to relevant research and campaigns if no enough funding can be obtained otherwise. Additionally, I am convinced a customer tax levied by the government on the use of plastic bags will also help to curb this massive “white pollution”. The havoc non-biodegradable refuse can wreak on the ecosystem is beyond our imagination. It can eventually devastate soil, water and the aquatic and terrestrial biota. We must start combating this environmental catastrophe before the ecosystem irretrievably breaks down under the reign of the minute plastic debris. 要是还有需要，请和我们世纪雅思的老师沟通吧~~
求java中Calendar类的用法例子（并附每条注释） 
Calendar类（理解） Calendar类是采用手工的方式取得日期，可以通过此类精确到毫秒，此类的定义如下：public abstract class Calendar extends Object implements Serializable, Cloneable, Comparable 这个类本身是一个抽象类，抽象类要想实例化肯定使用子类：GregorianCalendar package org.lxh.api.datedemo; import java.util.Calendar; import java.util.GregorianCalendar; public class CalendarDemo { public static void main(String[] args) { Calendar calendar = new GregorianCalendar(); System.out.println(＂YEAR: ＂ + calendar.get(Calendar.YEAR)); System.out.println(＂MONTH: ＂ + (calendar.get(Calendar.MONTH) + 1)); System.out.println(＂DATE: ＂ + calendar.get(Calendar.DATE)); System.out.println(＂HOUR_OF_DAY: ＂ + calendar.get(Calendar.HOUR_OF_DAY)); System.out.println(＂MINUTE: ＂ + calendar.get(Calendar.MINUTE)); System.out.println(＂SECOND: ＂ + calendar.get(Calendar.SECOND)); System.out.println(＂MILLISECOND: ＂ + calendar.get(Calendar.MILLISECOND)）； } } 但是现在有一个问题，如果每次取时间都按照这种方式取的话，那么得累死，那么能不能设计一个类，可以通过此 类直接取得时间呢，例如：现在给出了如下的一个接口：package org.lxh.api.datedemo; public interface DateTime {/***取得日期* @return 日期的字符串，例如：2009-12-22*/ public String getDate（) ；/***取得日期时间* @return 日期时间的字符串，例如：2009-12-22 11:06:23.345*/ public String getDateTime（) ；/***取得时间戳* @return 返回时间戳的字符串，例如：20091222110623345*/ public String getTimeStamp（) ； } 前面需要补0的问题需要注意，例如：01。
package org.lxh.api.datedemo; import java.util.Calendar; import java.util.GregorianCalendar; public class DateTimeImpl implements DateTime { private Calendar calendar; public DateTimeImpl() { this.calendar = new GregorianCalendar(); } public String getDate() { StringBuffer buf = new StringBuffer(); buf.append(calendar.get(Calendar.YEAR)).append(＂-＂); buf.append(this.addZero((calendar.get(Calendar.MONTH) + 1), 2)).append(＂-＂); buf.append(this.addZero(calendar.get(Calendar.DATE), 2)); return buf.toString(); } public String getDateTime() { StringBuffer buf = new StringBuffer(); buf.append(calendar.get(Calendar.YEAR)).append(＂-＂); buf.append(this.addZero((calendar.get(Calendar.MONTH) + 1), 2)).append(＂-＂); buf.append(this.addZero(calendar.get(Calendar.DATE), 2)).append(＂ ＂); buf.append(this.addZero(calendar.get(Calendar.HOUR_OF_DAY), 2)).append(＂:＂) ; buf.append(this.addZero(calendar.get(Calendar.MINUTE), 2)).append(＂:＂) ; buf.append(this.addZero(calendar.get(Calendar.SECOND), 2)).append(＂.＂) ; buf.append(this.addZero(calendar.get(Calendar.MILLISECOND), 3)) ; return buf.toString(); } @Override public String getTimeStamp() { StringBuffer buf = new StringBuffer(); buf.append(calendar.get(Calendar.YEAR)); buf.append(this.addZero((calendar.get(Calendar.MONTH) + 1), 2)); buf.append(this.addZero(calendar.get(Calendar.DATE), 2)); buf.append(this.addZero(calendar.get(Calendar.HOUR_OF_DAY), 2)); buf.append(this.addZero(calendar.get(Calendar.MINUTE), 2)) ; buf.append(this.addZero(calendar.get(Calendar.SECOND), 2)) ; buf.append(this.addZero(calendar.get(Calendar.MILLISECOND), 3)) ; return buf.toString(); } private String addZero(int num, int len) { StringBuffer buf = new StringBuffer(); buf.append(num); while (buf.length() buf.insert(0, 0); } return buf.toString(); } }
看你解答的英语特别好,有没有好的学习方法,比如英语单选
 解释如下做好单选很不容易的。
单项选择填空是这些年来高考试题中一直采用的一种题型，做好单项选择填空需要掌握选择填空的答题技巧，以便提高答题的准确率。
选择填空的答题技巧如下：一、整体把握，注意语境这些年来，单项选择填空淡化了对所谓“纯”语法和“纯”词汇的考查，而是在特定的语境中对语法和词汇进行考查，这就增加了考试的难度。
因此，考生必须具有综合运用语言的能力。
答题时我们必须读完全部信息，利用特定的语境来选出正确答案。
例如：—When shall we meet again？—Make it____day you like?it's all the same to me.?NMET1996?A. one B. any C. another D. some从语法角度看，A、B、C、D四个选项均可修饰day这一单词，但句子中提供了“it's all the same to me”这一特定信息，正确的答案只能是B。
—Good morning?Grand Hotel.—Hello?I'd like to book a room for the night of the 18th and 19th.—____？NMET2001?A. What can I do for you?B. Just a minute?please.C. What's the matter?D. At your service.该题属于情景对话题。
A的意思是“你需要帮忙吗？”或“我能为您做什么？”属服务员的客气话。
C的意思是询问出了什么事。
D的意思是“听您的吩咐”或“为您效劳”。
B的意思则为“请稍等”。
根据对话情境，只有选B合适。
二、注意排除思维定势的干扰在学习过程中，同学们进行了相当多的习题练习，因此对有些类型的题目自然而然地会产生思维定势。
当碰到一些已经发生了变化的新题目，如果不作分析而是凭老经验，想当然办事，势必造成错误。
为此，必须排除思维定势的干扰，以便选出正确的答案。
例如：—Have you seen____pen?I left it here this morning.—Is it____black one?I think I saw it somewhere.?NMET1997?A. a?the B. the?the C. the?a D. a?a在做这道题时，不少考生误用了“表示前面的话里或上文提到过的人或事物要用定冠词”这一语法规则，将A作为正确答案。
其实，这里的black one并非特指上文提到的pen。
答话人表达的是“是一支黑色的钢笔吗”这一意思，故正确答案是D。
—She can't help____the house because she's busy making a cake.？上海1997?A. to clean B. cleaningC. cleaned D. being cleanedcan't help后接-ing形式是同学们经常碰到的，但必须注意到can't help+-ing这一结构中can't help表示的是“情不自禁”的意思。
当can't help表示“不能帮助”时后面则要接不定式而不能接-ing形式，因此该题应选A。
—Alice?you feed the bird today？____？—But I fed it yesterday.?NMET1999?A. do you B. will youC. did't you D. don't you本题用的是带主语的祈使句，正确答案是B。
一般来说，英语中的祈使句是以动词原形开头的，但是为了指明是向谁提出请求或命令，主语也可以表示出来。
命题人有意地使用了主语，使得一些考生错误地认为此句不是祈使句而选错了答案。
三、注意分析句子成分明确句子成分特别是选项在句子中所担任的句子成分，有时对于我们选择正确答案是很有帮助的。
例如：On Saturday afternoon?Mr. Green went to the market?____some bananas and visited his cousin.?Met1991?A. bought B. buying C. to buy D. buy对句子稍作分析，我们就会发现本句中的空白处的句子成分与went、visited是三个并列谓语，后两个谓语用and加以连接，正确答案毫无疑问是A。
Is this factory____you visited last Friday?A. which B.where C. the one D. there应该知道这个句子的主语为this factory?this是定语？？is是连系动词当谓语，空白处缺少的是表语，所以C项是正确答案（the one后面省略了关系代词which或that）。
如果我们在factory前面加上定冠词the，答案则应选A，因为此时factory成了句子的表语。
四、注意捕获句子中的隐含信息为了考查考生观察问题、分析问题的能力，高考选择题中常常会把一些重要的信息隐含在语境之中，而不是直截了当地告诉考生。
因此，答题时必须十分注意获取隐含的信息。
例如：—Are the new rules working？—Yes.____books are stolen.?NMET1999?A. Few B. More C. Some D. None此题中的Yes提供了很重要的信息，它说明了答话人已肯定了新的规章在起作用，故正确答案是A。
至于D项中的none是不能当定语的，故不能选。
—Can you come on Monday or Tuesday？—I'm afraid____day is possible.?NMET1998?A. either B. neither C. some D. any此题中的“I'm afraid”就是隐含信息，它说明了答话人所持的是否定态度，也就是说星期一、星期二这两天都不行，所以B是正确的答案。
五、注意句式的变化在考查考生对基础知识的掌握过程中，命题人常会通过改变句子结构的方式来增加试题难度。
碰到这类题材时，要沉着冷静，仔细分析，以便选出正确的答案。
例如：John plays football____?if not better than?David.?NMET1994?A. as well B. as well asC. so well D. so well as这种把原级与比较级的用法混在同一个句子当中的用法，在中学教科书中并没有出现，考生碰到这种题目自然会感到很陌生。
如果我们冷静地思考一下就会明白if not better than是插...
     
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