本文目录一览：
- 1、如何用js代码实现下列功能
- 2、写一段javascript（或jQuery）代码实现以下功能？
- 3、请问如何使用原生JS实现以下功能，以及他的思路是如何的
- 4、请问怎么用javascript实现以下效果
如何用js代码实现下列功能
!DOCTYPE html
html
head
meta charset="utf-8" /
titleJavascript+HTML用正则表达式写一段输入的验证代码/title
style type="text/css"
table {
position: relative;
margin: auto;
font-family: Consolas;
font-size: 12px;
border: 1px solid black;
border-collapse: collapse;
width: 800px;
}
table tr td {
border: 1px solid black;
}
.center {
text-align: center;
}
/style
script type="text/javascript"
var V = {
date: new Date,
isError: true,
validationType: [
'cannot be blank',
'must be a valid email',
'must contain only numbers,single spaces.',
'must contain between 13 18 numbers, and single spaces.',
'expiry date cannot be expired.'
],
trim: function(v)
{
return v.replace(/^s*|s*$/g, '');
},
validateOnblur: function(obj, validationType)
{
var val = V.trim(obj.value);
switch (validationType)
{
case 0:
if (V.trim(obj.value) == '')
{
obj.value = '';
return V.validationType[0];
}
return '';
case 1:
if (!/^[w-]+@[w-]+.w+$/.test(val))
{
obj.value = '';
return V.validationType[1];
}
return '';
case 2:
if (!/^(+(d+))?d+$/.test(val))
{
obj.value = '';
return V.validationType[2];
}
return '';
case 3:
if (!/^[ds]{13,18}$/.test(val))
{
obj.value = '';
return V.validationType[3];
}
return '';
case 4:
var expirydate = document.getElementsByName('expirydate');
var year = expirydate[0].value;
var month = expirydate[1].value;
if (new Date(year, parseInt(month) - 1, 0) = V.date)
{
return V.validationType[4];
}
return '';
default:
return '';
}
},
checkNow: function(obj)
{
var _name = obj.name, validationType = -1;
if (_name == 'firstname' || _name == 'lastname' || _name == 'address')
{
validationType = 0;
}
else if (_name == 'email')
{
validationType = 1;
}
else if (_name == 'phone')
{
validationType = 2;
}
else if (_name == 'credit')
{
validationType = 3;
}
else if (_name == 'expirydate')
{
validationType = 4;
}
var cell = obj.parentElement;
if (cell.children[cell.children.length - 1].tagName.toLowerCase() == 'div')
{
cell.removeChild(cell.children[cell.children.length - 1]);
V.isError = false;
}
var error = V.validateOnblur(obj, validationType);
if (error != '')
{
var info = document.createElement('div');
info.style.color = 'red';
info.innerText = error;
cell.appendChild(info);
V.isError = true;
}
},
displayError: function(rows, len, flag)
{
for ( var i = 0; i len; i++)
{
var cell = rows[i].cells[1];
if (!cell)
{
continue;
}
var obj = cell.children[0];
if (flag)
{
if (typeof obj.value != 'undefined')
{
V.checkNow(obj);
}
}
else
{
obj.onblur = function()
{
V.checkNow(this);
}
if (obj.tagName.toLowerCase() == 'select')
{
cell.children[1].onblur = function()
{
V.checkNow(this);
}
}
}
}
}
};
window.onload = function ()
{
var form = document.formValidation;
var table = form.getElementsByTagName('table')[0];
var rows = table.rows, len = rows.length;
document.getElementById('submit').onclick = function()
{
V.displayError(rows, len, true);
}
form.onsubmit = function()
{
return !V.isError;
}
V.displayError(rows, len, false);
var date = V.date;
var expirydate = document.getElementsByName('expirydate');
for ( var i = 2014; i 2055; i++)
{
var option = document.createElement('option');
option.value = i;
option.innerText = i;
expirydate[0].appendChild(option);
}
expirydate[0].value = date.getFullYear();
}
/script
/head
body
form name="formValidation" method="post" action=""
table
caption!Form Validation!/caption
tr
tdfirst name:/td
tdinput type="text" name="firstname" //td
/tr
tr
tdlast name:/td
tdinput type="text" name="lastname" //td
/tr
tr
tdaddress:/td
tdtextarea name="address"/textarea/td
/tr
tr
tdemail:/td
tdinput type="text" name="email" //td
/tr
tr
tdphone:/td
tdinput type="text" name="phone" //td
/tr
tr
tddelivery method:/td
td
labelinput type="radio" name="delivery" checked="checked" /regular post/label
labelinput type="radio" name="delivery" /courier/label
labelinput type="radio" name="delivery" /express courier/label
/td
/tr
tr
tdcredit card number field: /td
tdinput type="text" name="credit" //td
/tr
tr
tdexpiry date:/td
td
select name="expirydate"/select year
select name="expirydate"
option value="1"01/option
option value="2"02/option
option value="3"03/option
option value="4"04/option
option value="5"05/option
option value="6"06/option
option value="7"07/option
option value="8"08/option
option value="9"09/option
option value="10"10/option
option value="11"11/option
option value="12"12/option
/select month
/td
/tr
tr
td class="center" colspan="2"
labelinput type="checkbox" name="newletter" /please sign me up for the newletter/label
/td
/tr
tr
td class="center" colspan="2"
input type="submit" value="submit" id="submit" /input type="reset" value="reset" id="reset" /
/td
/table
/form
/body
/html
写一段javascript（或jQuery）代码实现以下功能？
首先思路如下：
检测用户是否更改数量或单价
检测用户是否输入的是数字
计算，并返回值到总价中
简易代码如下：
以下为部分代码：
!--onkeyup方法是在键盘按键按下并松开时发生--
body onkeyup="count(number.value,price.value)"
input type="text" name="count" value="" id="number"/input
input type="text" name="price" value="" id="price"/input
span name="total" class="total_cls" id="total_id"/span
script
//count()输入值是数量和价格的value
function count(n,p){
if(Number(n)==n Number(p)==p)
//这一步是为了检测用户是否输入数字
{
document.getElementById("total_id").innerHTML=Number(n)*Number(p);
}
else
{
alert("输入有误");
}
}
/script
请问如何使用原生JS实现以下功能，以及他的思路是如何的
这个简单，使用for循环就可以了。
!DOCTYPE html
html
head
meta charset="utf-8"/
titletest/title
/head
body
div id="box"00/div
script type="text/javascript"
function liang(n){
var s = 1;
for(var i = 1; i = n; i++){
s *= i;
console.log('s==', s);
}
return s;
}
var a = liang(6);
document.getElementById('box').innerHTML = a;
/script
/body
/html
还有一个方法也可以：
function hermit(num){
if(num == 1 || num === 0){
return 1;
}else{
return (num * hermit(num -1));
}
}
var a = hermit(6);
document.getElementById('box').innerHTML = a;
请问怎么用javascript实现以下效果
你的问题还没解决呀，用jquery的话很好写的：
我写了一个完整的，你看下，还有问题私信我吧。
html
head
style type="text/css"
.collapse {
display: none;
}
.test {
display: block;
}
/style
script src="jquery-1.7.1.min.js"/script
script type="text/javascript"
window.onload = function () {
var hash = window.location.hash;
if (!hash) hash = "#user";
window.location.hash = hash; //请在下面补充实现方法
$("a[href$='" + hash + "']").parent().parent().removeClass("collapse").addClass("test");
}
/script
/head
body
ul class="nav nav-list collapse"
lia href="8.html#user"user/a/li
lia href="8.html#role"role/a/li
lia href="8.html#admin"admin/a/li
/ul
/body
/html