Der Inhalt dieses Artikels befasst sich mit der Implementierung der Warenkorbfunktion (Code) in JavaScript. Ich hoffe, dass er für Freunde hilfreich ist.
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>购物车</title>
<style>
table{
width: 600px;
margin: 0 auto;
border-collapse: collapse;
}
td{
border: 1px solid silver;
line-height: 40px;
text-align: center;
}
.btnl,.btnr{
border-style: none;
outline: none;
color: deeppink;
}
.txt{
width: 30px;
height: 30px;
border-style: none;
outline: none;
text-align: center;
}
</style>
</head>
<body>
<table>
<tr>
<td><button id="btna">全选</button></td>
<td>序号</td>
<td>名称</td>
<td>价钱</td>
<td>数量</td>
<td>小计</td>
<td>操作</td>
</tr>
<tr class="trinfo">
<td><input class="ckbox" type="checkbox"/></td>
<td>1</td>
<td>毛衣</td>
<td><span class="price">99</span>￥</td>
<td><button class="btnl">-</button><input type="text" class="txt" value="1"/><button class="btnr">+</button></td>
<td><span class="smallprice">99</span>￥</td>
<td><button class="btndelete">删除</button></td>
</tr>
<tr class="trinfo">
<td><input class="ckbox" type="checkbox"/></td>
<td>2</td>
<td>短袖</td>
<td><span class="price">108</span>￥</td>
<td><button class="btnl">-</button><input type="text" class="txt" value="1"/><button class="btnr">+</button></td>
<td><span class="smallprice">108</span>￥</td>
<td><button class="btndelete">删除</button></td>
</tr>
<tr class="trinfo">
<td><input class="ckbox" type="checkbox"/></td>
<td>3</td>
<td>运动鞋</td>
<td><span class="price">10000</span>￥</td>
<td><button class="btnl">-</button><input type="text" class="txt" value="1"/><button class="btnr">+</button></td>
<td><span class="smallprice">10000</span>￥</td>
<td><button class="btndelete">删除</button></td>
</tr>
<tr class="trinfo">
<td><input class="ckbox" type="checkbox"/></td>
<td>4</td>
<td>凉鞋</td>
<td><span class="price">25</span>￥</td>
<td><button class="btnl">-</button><input type="text" class="txt" value="1"/><button class="btnr">+</button></td>
<td><span class="smallprice">25</span>￥</td>
<td><button class="btndelete">删除</button></td>
</tr>
<tr >
<td><button id="btnf">反选</button></td>
<td colspan="6"><span>总计：<span class="totle">0</span>￥</span><button>去结算</button></td>
</tr>
</table>
<script>
//获取左右的按钮集合
var btnleft=document.getElementsByClassName("btnl");
var btnright=document.getElementsByClassName("btnr");
//获取表示数量的class名为txt的input元素集合
var txt=document.getElementsByClassName("txt");
//获取表示单价的class名为price的span元素集合
var price=document.getElementsByClassName("price");
//获取表示小计的class名为smallprice的span元素集合
var small=document.getElementsByClassName("smallprice");
//获取表示总价的class名为totle的span元素
var totle=document.getElementsByClassName("totle")[0];
//获取全选反选按钮和选择框
var btna=document.getElementById("btna");
var btnf=document.getElementById("btnf");
var box=document.getElementsByClassName("ckbox");
//获取删除按钮
var btndelete=document.getElementsByClassName("btndelete");
var trlist=document.getElementsByClassName("trinfo");
var totleprice=0; //定义全局变量totleprice的初值为0
//给数量左右两边的+-添加点击事件
for(var i=0;i<btnleft.length;i++)
{
btnleft[i].index=i; //把i的值赋给btnleft[i]的index
btnleft[i].onclick=function (){ //获取当前对应的文本框的值
var val=txt[this.index].value;
val--; //控制其数量的值不能小于1
if(val<=1)
{
val=1;
}
txt[this.index].value=val; //把更新了的val值再赋给txt[this.index].value
addprice(this.index); //调用一下addprice()使其在当前变化下执行
}
btnright[i].index=i; //把i的值赋给btnright[i]的index
btnright[i].onclick=function (){
var val=txt[this.index].value;
val++;
txt[this.index].value=val;
addprice(this.index);
}
//给checkbox添加点击事件
box[i].onclick=function (){
showtotleprice();
}
//给删除添加点击事件
btndelete[i].index=i;
btndelete[i].onclick=function (){
totleprice-=parseFloat(small[this.index].innerText); //将总计里面对应的价格也减掉
totle.innerText=totleprice;
trlist[this.index].remove(); //去掉对应的那一行元素
//重新更新索引 防止其他操作出错
for(var k=0;k<trlist.length;k++)
{
trlist[k].index=k;
btndelete[k].index=k;
btnleft[k].index=k;
btnright[k].index=k;
}
}
} //计算小计
function addprice(index){
small[index].innerText=(price[index].innerText*txt[index].value);
} //计算总计
function showtotleprice(){
totleprice=0;
for(var i=0;i<small.length;i++)
{
if(box[i].checked)
{
totleprice+=parseFloat(small[i].innerText);
}
}
totle.innerText=totleprice;
}
//全选
btna.onclick=function (){
for(var i=0;i<box.length;i++)
{
box[i].checked=true;
}
showtotleprice();
}
//反选
btnf.onclick=function (){
for(var i=0;i<box.length;i++)
{
box[i].checked=!box[i].checked;
}
showtotleprice();
}
</script>
</body>
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