2018-07-02

p14

<script>
"use strict"; // 启用 ECMAScript 5 严格模式
/*
* This script defines the calculate() function called by the event handlers
脚本定义了会在上面的HTML中事件处理所调用的calculate函数
* in HTML above. The function reads values from <input> elements, calculates
这个函数从<input>元素中读取值，计算贷款还款信息，然后将结果显示在<span> 元素中
* loan payment information, displays the results in <span> elements. It also
* saves the user's data, displays links to lenders, and draws a chart.
它还保存用户的数据，显示贷方的链接，然后画出一个表格
*/
function calculate() {
// Look up the input and output elements in the document
//查找、获得input和output元素
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.
//获取用户输入数据，假设全是合法的数据