首页 > 代码库 > JS函数大全 莫名其妙找到的
JS函数大全 莫名其妙找到的
1 .document.write(""); 输出语句
2 .JS中的注释为//
3 .传统的HTML文档顺序是:document->html->(head,body)
4 .一个浏览器窗口中的DOM顺序是:window->(navigator,screen,history,location,document)
5 .得到表单中元素的名称和值:document.getElementById("表单中元素的ID号").name(或value)
6 .一个小写转大写的JS: document.getElementById("output").value = http://www.mamicode.com/document.getElementById("input").value.toUpperCase();
7 .JS中的值类型:String,Number,Boolean,Null,Object,Function
8 .JS中的字符型转换成数值型:parseInt(),parseFloat()
9 .JS中的数字转换成字符型:(""+变量)
10 .JS中的取字符串长度是:(length)
11 .JS中的字符与字符相连接使用+号.
12 .JS中的比较操作符有:==等于,!=不等于,>,>=,<.<=
13 .JS中声明变量使用:var来进行声明
14 .JS中的判断语句结构:if(condition){}else{}
15 .JS中的循环结构:for([initial expression];[condition];[upadte expression]) {inside loop}
16 .循环中止的命令是:break
17 .JS中的函数定义:function functionName([parameter],...){statement[s]}
18 .当文件中出现多个form表单时.可以用document.forms[0],document.forms[1]来代替.
19 .窗口:打开窗口window.open(), 关闭一个窗口:window.close(), 窗口本身:self
20 .状态栏的设置:window.status="字符";
21 .弹出提示信息:window.alert("字符");
22 .弹出确认框:window.confirm();
23 .弹出输入提示框:window.prompt();
24 .指定当前显示链接的位置:window.location.href="http://www.mamicode.com/URL"
25 .取出窗体中的所有表单的数量:document.forms.length
26 .关闭文档的输出流:document.close();
27 .字符串追加连接符:+=
28 .创建一个文档元素:document.createElement(),document.createTextNode()
29 .得到元素的方法:document.getElementById()
30 .设置表单中所有文本型的成员的值为空:
var form = window.document.forms[0]
for (var i = 0; i<form.elements.length;i++){
if (form.elements[i].type == "text"){
form.elements[i].valuehttp://www.mamicode.com/= "";
}
}
31 .复选按钮在JS中判断是否选中:document.forms[0].checkThis.checked (checked属性代表为是否选中返回TRUE或FALSE)
32 .单选按钮组(单选按钮的名称必须相同):取单选按钮组的长度document.forms[0].groupName.length
33 .单选按钮组判断是否被选中也是用checked.
34 .下拉列表框的值:document.forms[0].selectName.options[n].value (n有时用下拉列表框名称加上.selectedIndex来确定被选中的值)
35 .字符串的定义:var myString = new String("This is lightsword");
36 .字符串转成大写:string.toUpperCase(); 字符串转成小写:string.toLowerCase();
37 .返回字符串2在字符串1中出现的位置:String1.indexOf("String2")!=-1则说明没找到.
38 .取字符串中指定位置的一个字符:StringA.charAt(9);
39 .取出字符串中指定起点和终点的子字符串:stringA.substring(2,6);
40 . 数学函数:Math.PI(返回圆周率),Math.SQRT2
(返回开方),Math.max(value1,value2)返回两个数中的最在值, Math.pow(value1,10)返回value1的十次方,Math.round(value1)四舍五入函数,Math.floor (Math.random()*(n+1))返回随机数
41 .定义日期型变量:var today = new Date();
42 .日期函数列表:dateObj.getTime()得到时间,dateObj.getYear()得到年份,dateObj.getFullYear()得到四位的年份,dateObj.getMonth()得到月份,dateObj.getDate()得到日,dateObj.getDay()得到日期几, dateObj.getHours()得到小时,dateObj.getMinutes()得到分,dateObj.getSeconds()得到秒, dateObj.setTime(value)设置时间,dateObj.setYear(val)设置年,dateObj.setMonth(val) 设置月,dateObj.setDate(val)设置日,dateObj.setDay(val)设置星期几,dateObj.setHours设置小时,dateObj.setMinutes(val)设置分,dateObj.setSeconds(val)设置秒 [注意:此日期时间从0开始计]
43 .FRAME的表示方式: [window.]frames[n].ObjFuncVarName,frames["frameName"].ObjFuncVarName,frameName.ObjFuncVarName
44 .parent代表父亲对象,top代表最顶端对象
45 .打开子窗口的父窗口为:opener
46 .表示当前所属的位置:this
47 .当在超链接中调用JS函数时用:(Javascript:)来开头后面加函数名
48 .在老的浏览器中不执行此JS:<!-- //-->
49 .引用一个文件式的JS:<script type="text/Javascript" src="http://www.mamicode.com/aaa.js"></script>
50 .指定在不支持脚本的浏览器显示的HTML:<noscript></noscript>
51 . 当超链和ONCLICK事件都有时,则老版本的浏览器转向a.html,否则转向b.html.例:<a href="http://www.mamicode.com/a.html" onclick="location.href=http://www.mamicode.com/‘b.html‘;return false">dfsadf</a>
52 .JS 的内建对象有:Array,Boolean,Date,Error,EvalError,Function,Math,Number,Object, RangeError,ReferenceError,RegExp,String,SyntaxError,TypeError,URIError
53 .JS中的换行:\n
54 . 窗口全屏大小:<script>function fullScreen(){ this.moveTo(0,0);this.outerWidth=screen.availWidth;this.outerHeight=screen.availHeight;}window.maximize=fullScreen;</script>
55 .JS中的all代表其下层的全部元素
56 .JS中的焦点顺序:document.getElementByid("表单元素").tabIndex = 1
57 .innerHTML 的值是表单元素的值:如<p id="para">"how are <em>you</em>"</p>,则innerHTML的值就是:how are <em>you</em>
58 .innerTEXT的值和上面的一样,只不过不会把<em>这种标记显示出来.
59 .contentEditable可设置元素是否可被修改,isContentEditable返回是否可修改的状态.
60 .isDisabled判断是否为禁止状态.disabled设置禁止状态
61 .length取得长度,返回整型数值
62 .addBehavior()是一种JS调用的外部函数文件其扩展名为.htc
63 .window.focus()使当前的窗口在所有窗口之前. onfocus获取焦点
64 .blur()指失去焦点.与FOCUS()相反. onblur失去焦点
65 .select()指元素为选中状态.
66 .防止用户对文本框中输入文本:onfocus="this.blur()"
67 .取出该元素在页面中出现的数量:document.all.tags("div(或其它HTML标记符)").length
68 .JS中分为两种窗体输出:模态和非模态.window.showModaldialog(),windo
w.showModeless()
69 .状态栏文字的设置:window.status=‘文字‘,默认的状态栏文字设置:window.defaultStatus = ‘文字.‘;
70 .添加到收藏夹:external.AddFavorite("http://www.xrss.cn","jaskdlf");
71 .JS中遇到脚本错误时不做任何操作:window.onerror = doNothing; 指定错误句柄的语法为:window.onerror = handleError;
72 .JS中指定当前打开窗口的父窗口:window.opener,支持opener.opener...的多重继续.
73 .JS中的self指的是当前的窗口
74 .JS中状态栏显示内容:window.status="内容"
75 .JS中的top指的是框架集中最顶层的框架
76 .JS中关闭当前的窗口:window.close();
77 .JS中提出是否确认的框:if(confirm("Are you sure?")){alert("ok");}else{alert("Not Ok");}
78 .JS中的窗口重定向:window.navigate("http://www.sina.com.cn");
79 .JS中的打印:window.print()
80 .JS中的提示输入框:window.prompt("message","defaultReply");
81 .JS中的窗口滚动条:window.scroll(x,y)
82 .JS中的窗口滚动到位置:window.scrollby
83 .JS中设置时间间隔:setInterval("expr",msecDelay)或setInterval(funcRef,msecDelay)或setTimeout
84 .JS中的模态显示在IE4+行,在NN中不行:showModalDialog("URL"[,arguments][,features]);
85 .JS 中的退出之前使用的句柄:function verifyClose(){event.returnValue="http://www.mamicode.com/we really like you and hope you will stay longer.";}} window.onbeforeunload=verifyClose;
86 .当窗体第一次调用时使用的文件句柄:onload()
87 .当窗体关闭时调用的文件句柄:onunload()
88 .window.location的属性: protocol(http:),hostname(www.example.com),port(80),host(www.example.com:80),pathname("/a/a.html"),hash("#giantGizmo",指跳转到相应的锚记),href(全部的信息)
89 .window.location.reload()刷新当前页面.
89 -1.parent.location.reload()刷新父亲对象(用于框架)
89 -2.opener.location.reload()刷新父窗口对象(用于单开窗口)
89 -3.top.location.reload()刷新最顶端对象(用于多开窗口)
90 .window.history.back()返回上一页,window.history.forward()返回下一页,window.history.go(返回第几页,也可以使用访问过的URL)
91 .document.write()不换行的输出,document.writeln()换行输出
92 .document.body.noWrap=true;防止链接文字折行.
93 .变量名.charAt(第几位),取该变量的第几位的字符.
94 ."abc".charCodeAt(第几个),返回第几个字符的ASCii码值.
95 .字符串连接:string.concat(string2),或用+=进行连接
96 .变量.indexOf("字符",起始位置),返回第一个出现的位置(从0开始计算)
97 .string.lastIndexOf(searchString[,startIndex])最后一次出现的位置.
98 .string.match(regExpression),判断字符是否匹配.
99 .string.replace(regExpression,replaceString)替换现有字符串.
100 .string.split(分隔符)返回一个数组存储值.
101 .string.substr(start[,length])取从第几位到指定长度的字符串.
102 .string.toLowerCase()使字符串全部变为小写.
103 .string.toUpperCase()使全
部字符变为大写.
104 .parseInt(string[,radix(代表进制)])强制转换成整型.
105 .parseFloat(string[,radix])强制转换成浮点型.
106 .isNaN(变量):测试是否为数值型.
107 .定义常量的关键字:const,定义变量的关键字:var
108 .push,添加数组元素,splice,删除数组元素,splice还可以进行替换元素splice(1,2),1为位置,2为要删除的个数。
109 获得 星期的日期:
if(new Date().getDay()==0) week="周日"
if(new Date().getDay()==1) week="周一"
if(new Date().getDay()==2) week="周二"
if(new Date().getDay()==3) week="周三"
if(new Date().getDay()==4) week="周四"
if(new Date().getDay()==5) week="周五"
if(new Date().getDay()==6) week="周六"
document.write((new Date().getMonth()+1)+"月"+new Date().getDate()+"日 "+week);
var d = new Date();
var vYear = d.getFullYear();
var vMon = (d.getMonth()+1)<10 ? "0" + (d.getMonth()+1) : (d.getMonth()+1);
var vDay = d.getDate()<10 ? "0" + d.getDate() : d.getDate();
var vHour = d.getHours()<10 ? "0" + d.getHours() : d.getHours();
var vMin1 = d.getMinutes()<10 ? "0" + d.getMinutes() : d.getMinutes();
var vMin = (d.getMinutes()+5)<10 ? "0" + (d.getMinutes()+5) : (d.getMinutes()+5);
var vSec = d.getSeconds()<10 ? "0" + d.getSeconds() : d.getSeconds();
var now_date = vYear + "-" + vMon + "-" + vDay +" " + vHour + ":"+ vMin1 + ":" + vSec;
110.escape 字符转换成所有计算机都可以使用的东东
111.unescape 将转换过的字符转换为正常的字符
112.jmask.dataQueue.splice(0,1); 从数组dataQueue去掉一个元素,位置是0
---------------
缓存解决方法:
self.location("mon.html");作用重新导入页面
---------------------------------------------
播放器最大化:
videoPlayer 为html里某个元素的ID
<script for="videoPlayer" event="onmouseup()">
if(videoPlayer.playState==3)
{
videoPlayer.fullScreen = ‘true‘;
}
</script>
----------------------------
得到某个元素的高度
this.oHtmlObj.all(‘tip‘).style.top = this.calculateOffsetTop(this.oContainer.oHtmlObj);
CheckBoxLable.prototype.calculateOffsetTop = function(field){
return this.calculateOffset(field, "offsetTop");
}
CheckBoxLable.prototype.calculateOffset = function(field, attr){
var offset = 0;
while(field) {
offset += field[attr];
field = field.offsetParent;
}
//alert("offset="+offset);
return offset;
}
------------------------------------
动态加滚动条:
<div style="width:195px;height:373px;overflow: auto">
</div>
隐藏x轴滚动条:
overflow-x: scroll
overflow-x: hidden
overflow-x: auto !important
style="width:190px;height:270px;overflow:scroll;overflow-x: auto;overflow-x:hidden;overflow-y:auto"
-------------------------------------------
//获得键盘事件:向上:window.event.keyCode==38 ,向下window.event.keyCode==40,回车key
Code=13 TAB键 keyCode=9
function document.onkeydown(){
if ((event.keyCode==38)){
}
if ((event.keyCode==40)){
}
}
-------------------------------
如何从一个日期中减掉几个小时
<script language = javascript><
var date = new date();
var date = new date(date.utc(date.getyear(),date.getmonth(),date.getdate(),date.gethours(),date.getminutes(),date.getseconds()) - 5*60*60*1000);
document.write(date);
//-script>
-------------
处理时间的例子:
1。解决2000问题
function y2k(number) { return (number < 1000) ? number + 1900 : number; }
2。检查日期是否合法
// 当输入参数为isdate(dd,mm,ccyy)时,表示要检查年,月,日
// 当输入参数为isdate(dd,mm) 表示默认年为当前年
// 当输入参数为isdate(dd) 表示默认年,月为当前年月
// 注意输入月份保证在1-12以内。
function isdate (day,month,year) {
var today = new date();
year = ((!year) ? y2k(today.getyear())year);
month = ((!month) ? today.getmonth():month-1);
if (!day) return false
var test = new date(year,month,day);
if ( (y2k(test.getyear()) == year) &&
(month == test.getmonth()) &&
(day == test.getdate()) )
return true;
else
return false
}
以下是调用例子:
if (isdate(31,2,1997))
document.write("valid");
else
document.write("invalid");
3。如何判断两个日期中的间隔天数
function dayselapsed(date1,date2) {
var difference = date.utc(date1.getyear(),date1.getmonth(),date1.getdate(),0,0,0)
- date.utc(date2.getyear(),date2.getmonth(),date2.getdate(),0,0,0);
return difference/1000/60/60/24;
}
4。如何将一个下拉列表框中的月份传递到另一页
<form>
<select name="selectname">
<option>january
<option>february
<option>march
<option>april
<option>may
<option>june
<option>july
<option>august
<option>spetember
<option>october
<option>november
<option>december
</select>
<input type="button" value="http://www.mamicode.com/go" onclick="window.location.href = http://www.mamicode.com/nextpage.html? +
this.form.selectname.options[this.form.selectname.selectedindex].text">
</form>
在nextpage.html中加入下面的代码
<form name="formname"><input type="text" name="textname"><form>
<script language="javascript"><
document.formname.textname.value = http://www.mamicode.com/location.search.substring(1);
//-script>
或则:
<script language="javascript"><
document.write("<form><input type=text ");
document.write("value="http://www.mamicode.com/location.search.substring(1)+"form>")
//-script>
5。如何将一个字符串中的时间和当前时间做比较
<script language="javascript">
/*其中的日期字符串可有以下格式:
格式 1 : 19970529
格式 2 : 970529
格式 3 : 29/05/1997
格式 4 : 29/05/97
输入参数datetype是1到4的数字,表示使用哪种格式.
*/
<!-
function isittoday(datestring,datetype) {
var now = new date();
var today = new date(now.getyear
(),now.getmonth(),now.getdate())
if (datetype == 1)
var date = new date(datestring.substring(0,4),
datestring.substring(4,6)-1,
datestring.substring(6,8));
else if (datetype == 2)
var date = new date(datestring.substring(0,2),
datestring.substring(2,4)-1,
datestring.substring(4,6));
else if (datetype == 3)
var date = new date(datestring.substring(6,10),
datestring.substring(3,5)-1,
datestring.substring(0,2));
else if (datetype == 4)
var date = new date(datestring.substring(6,8),
datestring.substring(3,5)-1,
datestring.substring(0,2));
else
return false;
if (date.tostring() == today.tostring())
return true;
else
return false;
}
调用的例子如下:
if (isittoday("19970529",1)) alert(true); else alert(false);
if (isittoday("970529",2)) alert(true); else alert(false);
if (isittoday("29/05/1997",3)) alert(true); else alert(false);
if (isittoday("02/06/97",4)) alert(true); else alert(false);
//-
</script>
6。如何根据一个人的生日计算他的岁数
<script language="javascript"><
/*其中的日期字符串可有以下格式:
格式 1 : 19970529
格式 2 : 970529
格式 3 : 29/05/1997
格式 4 : 29/05/97
输入参数datetype是1到4的数字,表示使用哪种格式.
*/
function getage(datestring,datetype) {
var now = new date();
var today = new date(now.getyear(),now.getmonth(),now.getdate())
var yearnow = now.getyear();
var monthnow = now.getmonth();
var datenow = now.getdate();
if (datetype == 1)
var dob = new date(datestring.substring(0,4),
datestring.substring(4,6)-1,
datestring.substring(6,8));
else if (datetype == 2)
var dob = new date(datestring.substring(0,2),
datestring.substring(2,4)-1,
datestring.substring(4,6));
else if (datetype == 3)
var dob = new date(datestring.substring(6,10),
datestring.substring(3,5)-1,
datestring.substring(0,2));
else if (datetype == 4)
var dob = new date(datestring.substring(6,8),
datestring.substring(3,5)-1,
datestring.substring(0,2));
else
return ;
var yeardob = dob.getyear();
var monthdob = dob.getmonth();
var datedob = dob.getdate();
yearage = yearnow - yeardob;
if (monthnow > monthdob)
var monthage = monthnow - monthdob;
else {
yearage--;
var monthage = 12 + monthnow -monthdob;
}
if (datenow > datedob)
var dateage = datenow - d
atedob;
else {
monthage--;
var dateage = 31 + datenow - datedob;
}
return yearage + years + monthage + months + dateage + days;
}
调用例子
document.write(getage("19650104",1)+br>)
document.write(getage("650104",2)+br>)
document.write(getage("04/01/1965",3)+br>)
document.write(getage("04/01/65",4)+br>)
//-script>
7。如何使用下面的格式dd/mm/yy在网页中显示日期
<script language = javascript>
<!-
var date = new date();
var d = date.getdate();
var day = (d < 10) ? 0 + d : d;
var m = date.getmonth() + 1;
var month = (m < 10) ? 0 + m : m;
var yy = date.getyear();
var year = (yy < 1000) ? yy + 1900 : yy;
document.write(day + "/" + month + "/" + year);
//-
</script>
8。如何使用下面的格式date month year在网页中显示日期
<script language = javascript>
<!-
function makearray() {
for (i = 0; i<makearray.arguments.length; i++)
this[i + 1] = makearray.arguments[i];
}
var months = new makearray(january,february,march,
april,may,june,july,august,september,
october,november,december);
var date = new date();
var day = date.getdate();
var month = date.getmonth() + 1;
var yy = date.getyear();
var year = (yy < 1000) ? yy + 1900 : yy;
document.write(day + " " + months[month] + " " + year);
//-
</script>
9.如何让我的网页的最近更新日期更易读
<script language = javascript><
function makearray0() {
for (i = 0; i<makearray0.arguments.length; i++)
this[i] = makearray0.arguments[i];
}
var days = new makearray0("sunday","monday","tuesday","wednesday",
"thursday","friday","saturday");
var months = new makearray0(january,february,march,
april,may,june,july,august,september,
october,november,december);
function nths(day) {
if (day == 1 || day == 21 || day == 31)
return st;
else
if (day == 2 || day == 22)
return nd;
if (day == 3 || day == 23)
return rd;
else return th;
}
function y2k(number) { return (number < 1000) ? number + 1900 : number; }
var last = document.lastmodified;
var date = new date(last);
document.write("last updated on " + days[date.getday()] + +
date.getdate() + nths(date.getdate()) + " " +
months[date.getmonth()] + ", " +
(y2k(date.getyear()) + "."
//-script>
10。如何显示到某个特定日期的倒记时
<script language="javascript"><
function y2k(number) { return (number < 1000) ? number + 1900 : number; }
function timetilldate(whenday,whenmonth,whenyear) {
var now = new date();
var thisday = now.getdate(), thismonth = now.getmonth() + 1, thisyear = y2k(now.getyear())
var yearsdifference = whenyear - thisyear, monthsdifference = 0, daysdifference = 0, string = ;
if (whenmonth >= thismonth) monthsdifference = whenmonth - thismonth;
else { yearsdifference--; monthsdifference = whenmonth + 12 - thismo
nth; }
if (whenday >= thisday)daysdifference = whenday - thisday;
else {
if (monthsdifference > 0) monthsdifference--;
else { yearsdifference--; monthsdifference+=11; }
daysdifference = whenday + 31 - thisday;
}
if (yearsdifference < 0) return ;
if ((yearsdifference == 0) && (monthsdifference == 0) && (daysdifference == 0))
return ;
if (yearsdifference > 0) {
string = yearsdifference + year;
if (yearsdifference > 1) string += s;
string += ;
}
if (monthsdifference > 0) {
string += monthsdifference + month;
if (monthsdifference > 1) string += s;
string += ;
}
if (daysdifference > 0) {
string += daysdifference + day;
if (daysdifference > 1) string += s;
string += ;
}
var difference = date.utc(now.getyear(),now.getmonth(),now.getdate(),now.gethours(),now.getminutes(),now.getseconds()) -
date.utc(now.getyear(),now.getmonth(),now.getdate(),0,0,0);
difference = 1000*60*60*24 - difference;
var hoursdifference = math.floor(difference/1000/60/60);
difference = difference - hoursdifference*1000*60*60
var minutesdifference = math.floor(difference/1000/60);
difference = difference - minutesdifference*1000*60
var secondsdifference = math.floor(difference/1000);
if (hoursdifference > 0) {
string += hoursdifference + hour;
if (hoursdifference > 1) string +=s;
string += ;
}
if (minutesdifference > 0) {
string += minutesdifference + minute;
if (minutesdifference > 1) string +=s;
string += ;
}
if (secondsdifference > 0) {
string += secondsdifference + second;
if (secondsdifference > 1) string +=s;
string += ;
}
return string;
}
调用例子,例如现在到31/12/1999还有多久。
document.write(timetilldate(31,12,1999));
//-script>
11。如何从一个日期中减掉几个小时
<script language = javascript><
var date = new date();
var date = new date(date.utc(date.getyear(),date.getmonth(),date.getdate(),date.gethours(),date.getminutes(),date.getseconds()) - 5*60*60*1000);
document.write(date);
//-script>
12。如何在一个日期中增加几个月后并能够正确显示出来
<script language="javascript"><
function makearray() {
for (i = 0; i<makearray.arguments.length; i++)
this[i + 1] = makearray.arguments[i];
}
var months = new makearray(january,february,march,april,
may,june,july,august,september,
october,november,december);
function nths(day) {
if (day == 1 || day == 21 || day == 31) return st;
else if (day == 2 || day == 22) return nd;
else if (day == 3 || day == 23) return rd;
else return th;
}
function y2k(number) { return (number < 1000) ? number + 1900 : number; }
function
monthsahead(noofmonths) {
var today = new date();
var date = new date(today.getyear(),today.getmonth() + noofmonths,today.getdate(),today.gethours(),today.getminutes(),today.getseconds())
return date.getdate() + nths(date.getdate()) + + months[date.getmonth() + 1] + + y2k(date.getyear())
}
调用例子:
document.write(monthsahead(6));
//-script>
JS函数大全 莫名其妙找到的