How to implement the shopping cart function in javascript (code)

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nbsp;html>


    <meta>
    <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>

                                                                                                                                                                                                                                                                                                                                                                                                        

全选	序号	名称	价钱	数量	小计	操作
	1	毛衣	99￥	-+	99￥	删除
	2	短袖	108￥	-+	108￥	删除
	3	运动鞋	10000￥	-+	10000￥	删除
	4	凉鞋	25￥	-+	25￥	删除
反选	总计：0￥去结算

<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>

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