(1)设一个泄洪闸每小时水位下降x厘米,上游流水每小时上升y厘米,由题意,得
从策划到设计制作,每一步都追求做到细腻,制作可持续发展的企业网站。为客户提供网站建设、成都网站制作、网站策划、网页设计、国际域名空间、雅安服务器托管、网络营销、VI设计、 网站改版、漏洞修补等服务。为客户提供更好的一站式互联网解决方案,以客户的口碑塑造优易品牌,携手广大客户,共同发展进步。
2y−2x=6
12x−4y=10
,
解得:
x=
11
4
y=
23
4
,
120÷(5×
11
4
-
23
4
)=15小时.
答:打开5个泄洪闸,还需15小时使水位降到安全线;
(2)设至少打开a个闸在4小时内使水位降至安全线.由题意,得
11
4
×4a-
23
4
×4=120,
解得:a=13,
答:至少打开13个泄洪闸.
我有个JS的要么?
你可以把他改下我是没时间帮你该哈!!!
!--日期框选择--
var DS_x,DS_y;
function dateSelector() //构造dateSelector对象,用来实现一个日历形式的日期输入框。
{
var myDate=new Date();
this.year=myDate.getFullYear(); //定义year属性,年份,默认值为当前系统年份。
this.month=myDate.getMonth()+1; //定义month属性,月份,默认值为当前系统月份。
this.date=myDate.getDate(); //定义date属性,日,默认值为当前系统的日。
this.inputName=''; //定义inputName属性,即输入框的name,默认值为空。注意:在同一页中出现多个日期输入框,不能有重复的name!
this.display=display; //定义display方法,用来显示日期输入框。
}
function display() //定义dateSelector的display方法,它将实现一个日历形式的日期选择框。
{
var week=new Array('日','一','二','三','四','五','六');
document.write("style type=text/css");
document.write(" .ds_font td,span { font: normal 12px 宋体; color: #000000; }");
document.write(" .ds_border { border: 1px solid #000000; cursor: hand; background-color: #DDDDDD }");
document.write(" .ds_border2 { border: 1px solid #000000; cursor: hand; background-color: #DDDDDD }");
document.write("/style");
var M=new String(this.month);
var d=new String(this.date);
if(M.length==1d.length==1){
document.write("input style='text-align:center;' id='DS_"+this.inputName+"' name='"+this.inputName+"' value='"+this.year+"-0"+this.month+"-0"+this.date+"' title=双击可进行编缉 ondblclick='this.readOnly=false;this.focus()' onblur='this.readOnly=true' readonly");}
else if(M.length==1d.length==2){
document.write("input style='text-align:center;' id='DS_"+this.inputName+"' name='"+this.inputName+"' value='"+this.year+"-0"+this.month+"-"+this.date+"' title=双击可进行编缉 ondblclick='this.readOnly=false;this.focus()' onblur='this.readOnly=true' readonly");}
else if(M.length==2d.length==1){
document.write("input style='text-align:center;' id='DS_"+this.inputName+"' name='"+this.inputName+"' value='"+this.year+"-"+this.month+"-0"+this.date+"' title=双击可进行编缉 ondblclick='this.readOnly=false;this.focus()' onblur='this.readOnly=true' readonly");}
else if(M.length==2d.length==2){
document.write("input style='text-align:center;' id='DS_"+this.inputName+"' name='"+this.inputName+"' value='"+this.year+"-"+this.month+"-"+this.date+"' title=双击可进行编缉 ondblclick='this.readOnly=false;this.focus()' onblur='this.readOnly=true' readonly");}
document.write("button style='width:60px;height:18px;font-size:12px;margin:1px;border:1px solid #A4B3C8;background-color:#DFE7EF;' type=button onclick=this.nextSibling.style.display='block' onfocus=this.blur()日期/button");
document.write("div style='position:absolute;display:none;text-align:center;width:0px;height:0px;overflow:visible' onselectstart='return false;'");
document.write(" div style='position:absolute;left:-60px;top:20px;width:142px;height:165px;background-color:#F6F6F6;border:1px solid #245B7D;' class=ds_font");
document.write(" table cellpadding=0 cellspacing=1 width=140 height=20 bgcolor=#CEDAE7 onmousedown='DS_x=event.x-parentNode.style.pixelLeft;DS_y=event.y-parentNode.style.pixelTop;setCapture();' onmouseup='releaseCapture();' onmousemove='dsMove(this.parentNode)' style='cursor:move;'");
document.write(" tr align=center");
document.write(" td width=12% onmouseover=this.className='ds_border' onmouseout=this.className='' onclick=subYear(this) title='减小年份'/td");
document.write(" td width=12% onmouseover=this.className='ds_border' onmouseout=this.className='' onclick=subMonth(this) title='减小月份'/td");
document.write(" td width=52%b"+this.year+"/bb年/bb"+this.month+"/bb月/b/td");
document.write(" td width=12% onmouseover=this.className='ds_border' onmouseout=this.className='' onclick=addMonth(this) title='增加月份'/td");
document.write(" td width=12% onmouseover=this.className='ds_border' onmouseout=this.className='' onclick=addYear(this) title='增加年份'/td");
document.write(" /tr");
document.write(" /table");
document.write(" table cellpadding=0 cellspacing=0 width=140 height=20 onmousedown='DS_x=event.x-parentNode.style.pixelLeft;DS_y=event.y-parentNode.style.pixelTop;setCapture();' onmouseup='releaseCapture();' onmousemove='dsMove(this.parentNode)' style='cursor:move;'");
document.write(" tr align=center");
for(i=0;i7;i++)
document.write(" td"+week[i]+"/td");
document.write(" /tr");
document.write(" /table");
document.write(" table cellpadding=0 cellspacing=2 width=140 bgcolor=#EEEEEE");
for(i=0;i6;i++)
{
document.write(" tr align=center");
for(j=0;j7;j++)
document.write(" td width=10% height=16 onmouseover=if(this.innerText!=''this.className!='ds_border2')this.className='ds_border' onmouseout=if(this.className!='ds_border2')this.className='' onclick=getValue(this,document.all('DS_"+this.inputName+"'))/td");
document.write(" /tr");
}
document.write(" /table");
document.write(" span style=cursor:hand onclick=this.parentNode.parentNode.style.display='none'【关闭】/span");
document.write(" /div");
document.write("/div");
dateShow(document.all("DS_"+this.inputName).nextSibling.nextSibling.childNodes[0].childNodes[2],this.year,this.month)
}
function subYear(obj) //减小年份
{
var myObj=obj.parentNode.parentNode.parentNode.cells[2].childNodes;
myObj[0].innerHTML=eval(myObj[0].innerHTML)-1;
dateShow(obj.parentNode.parentNode.parentNode.nextSibling.nextSibling,eval(myObj[0].innerHTML),eval(myObj[2].innerHTML))
}
function addYear(obj) //增加年份
{
var myObj=obj.parentNode.parentNode.parentNode.cells[2].childNodes;
myObj[0].innerHTML=eval(myObj[0].innerHTML)+1;
dateShow(obj.parentNode.parentNode.parentNode.nextSibling.nextSibling,eval(myObj[0].innerHTML),eval(myObj[2].innerHTML))
}
function subMonth(obj) //减小月份
{
var myObj=obj.parentNode.parentNode.parentNode.cells[2].childNodes;
var month=eval(myObj[2].innerHTML)-1;
if(month==0)
{
month=12;
subYear(obj);
}
myObj[2].innerHTML=month;
dateShow(obj.parentNode.parentNode.parentNode.nextSibling.nextSibling,eval(myObj[0].innerHTML),eval(myObj[2].innerHTML))
}
function addMonth(obj) //增加月份
{
var myObj=obj.parentNode.parentNode.parentNode.cells[2].childNodes;
var month=eval(myObj[2].innerHTML)+1;
if(month==13)
{
month=1;
addYear(obj);
}
myObj[2].innerHTML=month;
dateShow(obj.parentNode.parentNode.parentNode.nextSibling.nextSibling,eval(myObj[0].innerHTML),eval(myObj[2].innerHTML))
}
function dateShow(obj,year,month) //显示各月份的日
{
var myDate=new Date(year,month-1,1);
var today=new Date();
var day=myDate.getDay();
var selectDate=obj.parentNode.parentNode.previousSibling.previousSibling.value.split('-');
var length;
switch(month)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
length=31;
break;
case 4:
case 6:
case 9:
case 11:
length=30;
break;
case 2:
if((year%4==0)(year%100!=0)||(year%400==0))
length=29;
else
length=28;
}
for(i=0;iobj.cells.length;i++)
{
obj.cells[i].innerHTML='';
obj.cells[i].style.color='';
obj.cells[i].className='';
}
for(i=0;ilength;i++)
{
obj.cells[i+day].innerHTML=(i+1);
if(year==today.getFullYear()(month-1)==today.getMonth()(i+1)==today.getDate())
obj.cells[i+day].style.color='red';
if(year==eval(selectDate[0])month==eval(selectDate[1])(i+1)==eval(selectDate[2]))
obj.cells[i+day].className='ds_border2';
}
}
function getValue(obj,inputObj) //把选择的日期传给输入框
{
var myObj=inputObj.nextSibling.nextSibling.childNodes[0].childNodes[0].cells[2].childNodes;
if(obj.innerHTML)
if(obj.innerHTML.length==1myObj[2].innerHTML.length==1)
inputObj.value=myObj[0].innerHTML+"-0"+myObj[2].innerHTML+"-0"+obj.innerHTML;
else if(obj.innerHTML.length==1myObj[2].innerHTML.length==2)
inputObj.value=myObj[0].innerHTML+"-"+myObj[2].innerHTML+"-0"+obj.innerHTML;
else if(obj.innerHTML.length==2myObj[2].innerHTML.length==1)
inputObj.value=myObj[0].innerHTML+"-0"+myObj[2].innerHTML+"-"+obj.innerHTML;
else if(obj.innerHTML.length==2myObj[2].innerHTML.length==2)
inputObj.value=myObj[0].innerHTML+"-"+myObj[2].innerHTML+"-"+obj.innerHTML;
inputObj.nextSibling.nextSibling.style.display='none';
for(i=0;iobj.parentNode.parentNode.parentNode.cells.length;i++)
obj.parentNode.parentNode.parentNode.cells[i].className='';
obj.className='ds_border2'
}
function dsMove(obj) //实现层的拖移
{
if(event.button==1)
{
var X=obj.clientLeft;
var Y=obj.clientTop;
obj.style.pixelLeft=X+(event.x-DS_x);
obj.style.pixelTop=Y+(event.y-DS_y);
}
}
/***调用代码**
script language=javascript
var myDate=new dateSelector();
myDate.year=1900;//morenqiri
myDate.inputName='date'; //
myDate.display();
/script
*/
逐步教学:
1.点击聊天界面
2.点击“/”标志
3.点击“天气”
4.选择“晴天”
5.点击发送按钮
有疑问可以追问我!
希望你满意
import java.util.*;/**规则在这里 超过字数了 我吧缩进删了*/public class SolarTerm {public static void main(String[] s) throws Exception{SolarTerm st = new SolarTerm();if(s.length == 3){System.out.println(st.getSoralTerm(Integer.parseInt(s[0]), Integer.parseInt(s[1]), Integer.parseInt(s[2])));}System.out.println(st.getSoralTerm(2009, 1, 5));System.out.println(st.getSoralTerm(2009, 1, 20));System.out.println(st.getSoralTerm(2009, 1, 23));System.out.println(st.getSoralTerm(2009, 2, 18));}final static long[] STermInfo = new long[] { 0, 21208, 42467, 63836, 85337,107014, 128867, 150921, 173149, 195551, 218072, 240693, 263343,285989, 308563, 331033, 353350, 375494, 397447, 419210, 440795,462224, 483532, 504758 };private static final String[] SolarTerm = new String[] { "小寒", "大寒", "立春", "雨水","惊蛰", "春分", "清明", "谷雨", "立夏", "小满", "芒种", "夏至", "小暑", "大暑", "立秋","处暑", "白露", "秋分", "寒露", "霜降", "立冬", "小雪", "大雪", "冬至"};public SolarTerm(){}/** 核心方法 根据日期得到节气 */public String getSoralTerm(Date Date){Calendar cal = Calendar.getInstance();cal.setTime(Date);int y = cal.get(Calendar.YEAR);int m = cal.get(Calendar.MONTH) + 1;int d = cal.get(Calendar.DAY_OF_MONTH);return getSoralTerm(y, m, d);}/** 核心方法 根据日期(y年m月d日)得到节气 */public String getSoralTerm(int y, int m, int d){String solarTerms;if (d == sTerm(y, (m - 1) * 2)) solarTerms = SolarTerm[(m - 1) * 2];else if (d == sTerm(y, (m - 1) * 2 + 1)) solarTerms = SolarTerm[(m - 1) * 2 + 1];else{//到这里说明非节气时间 solarTerms = "";}return solarTerms;}// ===== y年的第n个节气为几日(从0小寒起算)private int sTerm(int y, int n) {Calendar cal = Calendar.getInstance();cal.set(1900, 0, 6, 2, 5, 0);long temp = cal.getTime().getTime();cal.setTime(new Date( (long) ((31556925974.7 * (y - 1900) + STermInfo[n] * 60000L) + temp)));return cal.get(Calendar.DAY_OF_MONTH);}}
不知道你想要干什么……什么连续下雨?
用到UI吗?
把每个雨滴当做对象,抽象出来一个雨滴的类,里面包含雨落下的方向,速度,和失效的条件(落到地上了)。
再建立一个包含所有雨滴的容器,UI展示是通过容器里面获得的雨点对象来展示。
这样,容器里面每多出一个雨点对象,页面上就多出一个雨点。用完的对象从容器里面拿出来就好
1:从官方下载这个引用.jar包
2:到Web App Libraries →引用.jar包
3:org.apache.commons.dbutils→选择你要的查看的class文件.
4:这时候会显示source not found,这时候点击 attach source,
然后找到你下载的commons-dbutils-1.2-sources.jar,把它引入.
5:如果你想要自己改源代码,就ctrl+A,然后选中你的项目名,paste粘贴.
这样会自己动生成文件,及包.