<!DOCTYPE html>
<html>
<head>
<title>JavaScript Loan Calculator</title>
<style> /* This is a CSS style sheet: it adds style to the program output */
.output { font-weight: bold; } /* Calculated values in bold */
#payment { text-decoration: underline; } /* For element with id="payment" */
#graph { border: solid black 1px; } /* Chart has a simple border */
th, td { vertical-align: top; } /* Don't center table cells */
</style>
</head>
<body>
<!--
This is an HTML table with <input> elements that allow the user to enter data
and <span> elements in which the program can display its results.
These elements have ids like "interest" and "years". These ids are used
in the JavaScript code that follows the table. Note that some of the input
elements define "onchange" or "onclick" event handlers. These specify strings
of JavaScript code to be executed when the user enters data or clicks.
-->
<table>
<tr><th>Enter Loan Data:</th>
<td></td>
<th>Loan Balance, Cumulative Equity, and Interest Payments</th></tr>
<tr><td>Amount of the loan ($):</td>
<td><input id="amount" onchange="calculate();"></td>
<td rowspan=8>
<canvas id="graph" width="400" height="250"></canvas></td></tr>
<tr><td>Annual interest (%):</td>
<td><input id="apr" onchange="calculate();"></td></tr>
<tr><td>Repayment period (years):</td>
<td><input id="years" onchange="calculate();"></td>
<tr><td>Zipcode (to find lenders):</td>
<td><input id="zipcode" onchange="calculate();"></td>
<tr><th>Approximate Payments:</th>
<td><button onclick="calculate();">Calculate</button></td></tr>
<tr><td>Monthly payment:</td>
<td>$<span class="output" id="payment"></span></td></tr>
<tr><td>Total payment:</td>
<td>$<span class="output" id="total"></span></td></tr>
<tr><td>Total interest:</td>
<td>$<span class="output" id="totalinterest"></span></td></tr>
<tr><th>Sponsors:</th><td colspan=2>
Apply for your loan with one of these fine lenders:
<div id="lenders"></div></td></tr>
</table>
<!-- The rest of this example is JavaScript code in the <script> tag below -->
<!-- Normally, this script would go in the document <head> above but it -->
<!-- is easier to understand here, after you've seen its HTML context. -->
<script>
"use strict"; // Use ECMAScript 5 strict mode in browsers that support it
/*
* This script defines the calculate() function called by the event handlers
* in HTML above. The function reads values from <input> elements, calculates
* loan payment information, displays the results in <span> elements. It also
* saves the user's data, displays links to lenders, and draws a chart.
*/
function calculate() {
// Look up the input and output elements in the document
var amount = document.getElementById("amount");
var apr = document.getElementById("apr");
var years = document.getElementById("years");
var zipcode = document.getElementById("zipcode");
var payment = document.getElementById("payment");
var total = document.getElementById("total");
var totalinterest = document.getElementById("totalinterest");
// Get the user's input from the input elements. Assume it is all valid.
// Convert interest from a percentage to a decimal, and convert from
// an annual rate to a monthly rate. Convert payment period in years
// to the number of monthly payments.
var principal = parseFloat(amount.value);
var interest = parseFloat(apr.value) / 100 / 12;
var payments = parseFloat(years.value) * 12;
// Now compute the monthly payment figure.
var x = Math.pow(1 + interest, payments); // Math.pow() computes powers
var monthly = (principal*x*interest)/(x-1);
// If the result is a finite number, the user's input was good and
// we have meaningful results to display
if (isFinite(monthly)) {
// Fill in the output fields, rounding to 2 decimal places
payment.innerHTML = monthly.toFixed(2);
total.innerHTML = (monthly * payments).toFixed(2);
totalinterest.innerHTML = ((monthly*payments)-principal).toFixed(2);
// Save the user's input so we can restore it the next time they visit
save(amount.value, apr.value, years.value, zipcode.value);
// Advertise: find and display local lenders, but ignore network errors
try { // Catch any errors that occur within these curly braces
getLenders(amount.value, apr.value, years.value, zipcode.value);
}
catch(e) { /* And ignore those errors */ }
// Finally, chart loan balance, and interest and equity payments
chart(principal, interest, monthly, payments);
}
else {
// Result was Not-a-Number or infinite, which means the input was
// incomplete or invalid. Clear any previously displayed output.
payment.innerHTML = ""; // Erase the content of these elements
total.innerHTML = ""
totalinterest.innerHTML = "";
chart(); // With no arguments, clears the chart
}
}
// Save the user's input as properties of the localStorage object. Those
// properties will still be there when the user visits in the future
// This storage feature will not work in some browsers (Firefox, e.g.) if you
// run the example from a local file:// URL. It does work over HTTP, however.
function save(amount, apr, years, zipcode) {
if (window.localStorage) { // Only do this if the browser supports it
localStorage.loan_amount = amount;
localStorage.loan_apr = apr;
localStorage.loan_years = years;
localStorage.loan_zipcode = zipcode;
}
}
// Automatically attempt to restore input fields when the document first loads.
window.onload = function() {
// If the browser supports localStorage and we have some stored data
if (window.localStorage && localStorage.loan_amount) {
document.getElementById("amount").value = localStorage.loan_amount;
document.getElementById("apr").value = localStorage.loan_apr;
document.getElementById("years").value = localStorage.loan_years;
document.getElementById("zipcode").value = localStorage.loan_zipcode;
}
};
// Pass the user's input to a server-side script which can (in theory) return
// a list of links to local lenders interested in making loans. This example
// does not actually include a working implementation of such a lender-finding
// service. But if the service existed, this function would work with it.
function getLenders(amount, apr, years, zipcode) {
// If the browser does not support the XMLHttpRequest object, do nothing
if (!window.XMLHttpRequest) return;
// Find the element to display the list of lenders in
var ad = document.getElementById("lenders");
if (!ad) return; // Quit if no spot for output
// Encode the user's input as query parameters in a URL
var url = "getLenders.php" + // Service url plus
"?amt=" + encodeURIComponent(amount) + // user data in query string
"&apr=" + encodeURIComponent(apr) +
"&yrs=" + encodeURIComponent(years) +
"&zip=" + encodeURIComponent(zipcode);
// Fetch the contents of that URL using the XMLHttpRequest object
var req = new XMLHttpRequest(); // Begin a new request
req.open("GET", url); // An HTTP GET request for the url
req.send(null); // Send the request with no body
// Before returning, register an event handler function that will be called
// at some later time when the HTTP server's response arrives. This kind of
// asynchronous programming is very common in client-side JavaScript.
req.onreadystatechange = function() {
if (req.readyState == 4 && req.status == 200) {
// If we get here, we got a complete valid HTTP response
var
JavaScript常用代码示例.zip
需积分: 5 8 浏览量
2024-03-05
17:39:48
上传
评论
收藏 143KB ZIP 举报
JavaScript常用代码示例.zip （125个子文件） 
20.05.permanote.appcache 72B 06.04.classof 162B
01.01.loancalc.html 13KB 22.15.zipcodes.html 13KB 22.03.guessinggame.html 7KB 21.03.clock.html 4KB 22.04.TwitterSearch.html 3KB 22.10.ImageThumbnailer.html 3KB 16.02.windows.html 3KB 17.04.draggable_clock.html 2KB 22.16.wschatclient.html 2KB 18.15.chatclient.html 2KB 14.04.multiprompt.html 2KB 13.02.digital_clock.html 1KB 16.01.cssexample.html 1KB 22.12.FileTyper.html 1KB 13.01.reveal.html 1KB 22.11.FileReader.html 834B 13.03.from1996.html 627B 20.06.permanote.html 571B 17.08.Keymap.js 9KB 17.05.dndlist.js 7KB 22.13.fs.js 7KB 17.03.Enclose.js 6KB 09.16.Sets.js 6KB 12.01.rhinoURLFetcher.js 5KB 18.16.EventSourceEmulation.js 5KB 20.07.permanote.js 5KB 15.07.TOC.js 5KB 17.06.InputFilter.js 5KB 09.23.properties.js 4KB 17.02.Drag.js 4KB 21.02.PieChart.js 4KB 12.02.nodeserver.js 4KB 16.03.animations.js 4KB 21.13.sparkline.js 4KB 20.02.CookieStorage.js 4KB 09.03.Complex.js 4KB 20.04.appcacheevents.js 3KB 18.17.chatserver.js 3KB 09.06.Set1.js 3KB 18.13.linkdetails.js 3KB 16.05.classList.js 3KB 18.11.fileDropTarget.js 3KB 12.03.httputils.js 3KB 15.02.traversal.js 3KB 22.02.whereami.js 3KB 15.06.insert.js 3KB 06.02.extend.js 2KB 09.08.Cards.js 2KB 21.06.koch.js 2KB 21.07.curves.js 2KB 17.01.whenReady.js 2KB 09.24.Set2.js 2KB 15.05.outerHTML.js 2KB 08.03.extend_patched.js 2KB 21.10.smear.js 2KB 15.04.sortrows.js 2KB 22.17.wschatserver.js 2KB 22.14.fsworker.js 2KB 09.07.enumeration.js 2KB 09.17.objectid.js 2KB 08.04.addPrivateProperty.js 2KB 22.01.getmap.js 2KB 09.09.genericmethods.js 2KB 18.14.getJSONP.js 2KB 18.12.timedGetText.js 2KB 21.04.polygons.js 2KB 16.06.addStyles.js 2KB 09.04.type.js 2KB 22.05.TwitterSearch.js 2KB 08.02.functions_as_data.js 2KB 09.01.range.js 2KB 20.03.UserDataStorage.js 1KB 09.21.range6.js 1KB 11.01.linesgenerator.js 1KB 09.22.StringSet.js 1KB 09.15.FilteredSet.js 1KB 09.02.range2.js 1KB 21.05.graphics_state_utils.js 1KB 09.18.range4.js 1KB 06.03.extend2.js 1KB 21.01.rollover.js 1KB 22.06.SmearImage.js 1KB 18.03.get.js 1KB 18.10.postFormData.js 1KB 09.19.freezeProps.js 1KB 14.02.urlArgs.js 1KB 18.09.autoUpload.js 1KB 16.04.scale.js 1KB 18.08.postXML.js 1KB 14.01.invoke.js 1KB 08.01.defining_functions.js 1KB 22.08.AjaxWorker.js 1KB 09.12.SingletonSet.js 1KB 22.07.SmearWorker.js 1KB 09.05.quacks.js 1KB 20.01.getCookies.js 951B 09.11.defineSubclass.js 947B 14.03.uaparser.js 930B共 125 条
- 1
- 2
资源评论
shandongwill
- 粉丝: 3429
- 资源: 413
最新资源
- 数据库标识码BSM重排序工具、重构标识码工具
- 基于C语言的校园导航系统报告.doc
- __init__.py
- tensorflow-gpu-2.6.5-cp39-cp39-manylinux2010-x86-64.whl
- tensorflow-rocm-2.13.1.600-cp38-cp38-manylinux2014-x86-64.whl
- tensorflow-rocm-2.13.0.570-cp311-cp311-manylinux2014-x86-64.whl
- 3ds_1.0_3.6.ipa
- 卷积神经网络（Convolutional Neural Network，CNN
- 网页设计HTML、CSS和JS网页设计HTML、CSS和JS
- 利用Python构建作物病虫害识别分类系统
资源上传下载、课程学习等过程中有任何疑问或建议，欢迎提出宝贵意见哦~我们会及时处理！
点击此处反馈
