题目：采购系统
一、语言和环境
A 实现语言
JavaScript/Jquery + HTML
二、要求
通过提供给的js对象数组，该数组内的信息是商品的库存信息。
var goods= [
{"goodid":"1000100","goodname":"水杯","goodprice":50,"goodstore":100,"goodtype":"日用品"},
{"goodid":"1000101","goodname":"毛巾","goodprice":10,"goodstore":10,"goodtype":"日用品"},
{"goodid":"1000102","goodname":"牙膏","goodprice":10,"goodstore":100,"goodtype":"日用品"},
{"goodid":"1000103","goodname":"耳机","goodprice":100,"goodstore":10,"goodtype":"电子产品"},
{"goodid":"1000104","goodname":"手机","goodprice":5000,"goodstore":100,"goodtype":"电子产品"},
{"goodid":"1000105","goodname":"笔记本电脑","goodprice":5000,"goodstore":10,"goodtype":"电子产品"},
{"goodid":"1000106","goodname":"鼠标","goodprice":50,"goodstore":10,"goodtype":"电子产品"}
]
实现一个采购申请功能，包含商品库存列表的展示，加入到采购单，合计，小计，从采购单中移除，商品数量、商品进价的校验，如下：
1：打开采购申请，列出商品库存信息。
前端 样式自写！！！
for (var i = 0; i < goods.length; i++) {
let onegod = goods[i]
let trs = "";
trs += "<td class='name'>" + onegod.goodid + "</td>"
trs += "<td>" + onegod.goodname + "</td>"
trs += "<td>" + onegod.goodprice + "</td>"
trs += "<td>" + onegod.goodtype + "</td>"
trs += "<td>" + onegod.goodstore + "</td>"
trs += "<td><input type='button' value='添加到购物车' οnclick='tianjia(this)'></td>"
var tr = document.createElement("tr");
tr.innerHTML = trs
ac.appendChild(tr)
}
2. 点击 “添加到采购”按钮，会在采购详情中添加一行，添加的时候会显示会相对应的小计：
3.点击不同的商品，会在购物车中添加不同的商品，点击相同的商品会在原来的基础上数量加1，小计合计同步更改：
function tianjia(obj) {
var num = 1
let number;
let a = document.getElementsByClassName("gname");
if (ab.children.length == 0) {
var str = ""
str += "<td class='gname'>" + obj.parentNode.parentNode.children[0].innerText + "</td>"
str += "<td>" + obj.parentNode.parentNode.children[1].innerText + "</td>"
str += "<td><input type=text></td>"
str += "<td><input type='text' class='jin' value='" + Number(obj.parentNode.parentNode.children[2]
.innerText) * 0.7 + "'></td>"
str += "<td><input type='number' class='shu' value='" + num + "'></td>"
str += "<td>" + Number(obj.parentNode.parentNode.children[2].innerText) * 0.7 * num + "</td>"
str += "<td><input type='button' value='删除' οnclick='del(this)'></td>"
var tr = document.createElement("tr")
tr.innerHTML = str
ab.appendChild(tr)
--obj.parentNode.parentNode.children[4].innerText
} else {
var flag = false;
for (var i = 0; i < a.length; i++) {
if (obj.parentNode.parentNode.children[0].innerText == a[i].innerText) {
flag = true
number = i
break
}
}
if (flag == true) {
if (obj.parentNode.parentNode.children[4].innerText >0) {
obj.parentNode.parentNode.children[4].innerText--
a[number].parentNode.children[4].children[0].value++
a[number].parentNode.children[5].innerText = a[number].parentNode.children[4].children[0].value * a[
number].parentNode.children[3].children[0].value
}else{
obj.parentNode.parentNode.children[4].innerText=0
alert("不能再减了")
}
} else {
var str = ""
str += "<td class='gname'>" + obj.parentNode.parentNode.children[0].innerText + "</td>"
str += "<td>" + obj.parentNode.parentNode.children[1].innerText + "</td>"
str += "<td><input type=text></td>"
str += "<td><input type='text' class='jin' value='" + Number(obj.parentNode.parentNode.children[2]
.innerText) * 0.7 + "'></td>"
str += "<td><input type='number' class='shu' value='" + num + "'></td>"
str += "<td>" + Number(obj.parentNode.parentNode.children[2].innerText) * 0.7 * num + "</td>"
str += "<td><input type='button' value='删除' οnclick='del(this)'></td>"
var tr = document.createElement("tr")
tr.innerHTML = str
ab.appendChild(tr)
--obj.parentNode.parentNode.children[4].innerText
}
}
jisuan()
}
4. 如果录入的数字<0或者非数字给与一定的提示
5.录入进价>售价，进价太高不可用
function butprice(obj) {
let goods = $(".goodsnames")
let price00 = $(".price0")
let a = 0;
for (var i = 0; i < goods.length; i++) {
if (goods[i].innerText == obj.parentNode.parentNode.children[1].innerText) {
a = price00[i].innerText;
// alert(a)
}
}
if (obj.value > a) {
alert("进价太高")
} else {
obj.parentNode.parentNode.children[5].innerText = obj.parentNode.parentNode.children[3].children[0].value *
obj.parentNode.parentNode.children[4].children[0].value;
}
total();
}
6. 点击采购详情中的删除按钮，删除当前行之前会进行提示，确认删除当前行的时候删除当前行
function delall(obj) {
let delcon = confirm("确定？")
if (delcon) {
obj.parentNode.parentNode.remove()
}
total();
}
7.确定删除后删除当前，并重新计算合计：
function total(){
let alltoprice = $(".totalprice")
let num = 0;
for (var i = 0; i < alltoprice.length; i++) {
num += Number(alltoprice[i].innerText)
}
alert(num)
$("#heji").text(num)
}