JavaScript实现购物车计数器

来源：好走旅游网
<head>
	<meta charset="utf-8" />
	<title></title>
	<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" charset="utf-8">
	<style type="text/css">
		ul {
			list-style: none;
		}
		
		ul li {
			text-align: center;
		}
		
		.a1 {
			float: left;
		}
		
		.a2 {
			position: relative;
			left: -120px;
			top: 50px;
		}
		
		.a3 {
			position: relative;
			left: 110px;
			top: 10px;
		}
		
		.a4 {
			position: relative;
			left: 110px;
			top: 10px;
		}
		
		.a5 {
			position: relative;
			left: 110px;
			top: 10px;
		}
		
		.a6 {
			position: relative;
			left: 110px;
			top: 10px;
		}
		
		.a7 {
			position: relative;
			left: 110px;
			top: 10px;
		}
		
		#a9 {
			position: relative;
			top: 50px;
			left: -30px;
		}
		table tr:nth-child(odd){
			background-color: blue;
		}
		
		table tr:nth-child(even){
			background-color: yellowgreen;
		}
		
	</style>
	<script src="lib/jquery-1.8.2.min.js" type="text/javascript" charset="utf-8"></script>
	<script src="lib/angular.min.js" type="text/javascript" charset="utf-8"></script>
</head>

<body ng-app="myapp" ng-controller="myctrl">

	<br />
	<table border="" cellspacing="0" cellpadding="0" width="200px" height="200px">
		<tr>
			<td><img src="img/1.PNG" /></td>
		</tr>
		<tr>
			<td><img src="img/4.PNG" style="float: left;" />
				<p class="a1">大兴史各庄大西瓜5-10kg</p>
				<p class="a2" style="color: red;">￥<span style="">50.0</span></p>
				<input type="button" class="a3" value="-" onclick="res(this)" />
				<span class="a4">
					5	
				</span>
				<input type="button" class="a5" value="+" onclick="plus(this)" />
				<input type="button" class="a6" value="删除" onclick="del(this)" />
				<span class="a7">250</span>
			</td>
		</tr>
		<tr>
			<td><img src="img/3.PNG" style="float: left;" />
				<p class="a1">台湾大芒果</p>
				<p id="a9" style="color: red;">￥<span style="">39.0</span></p>
				<input type="button" class="a3" value="-" onclick="res(this)" />
				<span class="a4">
						2	
				</span>
				<input type="button" class="a5" value="+" onclick="plus(this)" />
				<input type="button" class="a6" value="删除" onclick="del(this)" />
				<span class="a7">78</span>
			</td>
		</tr>
		<tr>
			<td><img src="img/4.PNG" style="float: left;" />
				<p class="a1">大兴史各庄大西瓜5-10kg</p>
				<p class="a2" style="color: red;">￥<span style="">50.0</span></p>
				<input type="button" class="a3" value="-" ng-click="{{x.num=x+1}}" />
				<span class="a4">
					6		
				</span>
				<input type="button" class="a5" value="+" onclick="plus(this)" />
				<input type="button" class="a6" value="删除" onclick="del(this)" />
				<span class="a7">300</span>
			</td>
		</tr>
	</table>
	<div>
		<p style="color: red;position: relative;left: 300px;">总价：<span id="total">1000</span>
			<input type="button" id="" value="添加" onclick="add()" />
		</p>

	</div>
	<ul hidden="hidden">
		<li>
			<h4>添加页面</h4></li>
		<li>商品名称:<input type="text" id="bname" placeholder="商品名字不能为空"> </li>
		<li>商品价格:<input type="text" id="bprice" value="" placeholder="商品价格不能小于0" /></li>
		<li>商品数量:<input type="text" id="bnum" value="" placeholder="商品数量不能小于0" /></li>
		<li><input type="button" id="add" value="保存"  /></li>
	</ul>

	<script type="text/javascript">
		//添加
		function add() {
			if(confirm("您确定要添加吗")) {
				$("ul").show();
			} else {
				$("ul").hide();
			}
		}
		//删除
		function del(obj){
			if(confirm("您确定要删除吗")){
				alert("删除成功")
				$(obj).parent().parent().remove();		
			}else{
				alert("吓死宝宝了")
			}
		
		}
		//减少
		function res(obj) {
			var ele = $(obj).next();
			var v = ele.text();
			if(v == 0) {
				$(obj).parent().parent().remove();
			} else {
				v--;
				ele.text(v);
				var p=$(obj).parent().children(":nth-child(3)").children().text();
				var s =$(obj).parent().children(":nth-child(8)");
				s.text(p*v);
			}
			getTotal();
		}
		//总计
		function getTotal(){
			var t=0;
			var cs = $("tr :nth-child(1)").children(":nth-child(8)");
			cs.each(function(){
				var v =$(this).text();
				t+=parseInt(v);
			})
			$("#total").text(t);
		}
		//增加
		function plus(obj){
			var ele = $(obj).prev();
			var v = ele.text();
			
			v++;
			ele.text(v);
			var p=$(obj).parent().children(":nth-child(3)").children().text();
			var s =$(obj).parent().children(":nth-child(8)");
			s.text(p*v);
			getTotal();
		}
		
		$(function(){
			$("#add").click(function(){
				var bname = $("#bname").val();
				var bprice = $("#bprice").val();
				var bnum = $("#bnum").val();
				if(bname==""||bname.length==0) {
					alert("商品名称不能为空");
					return;
				}
				if(bprice<=0){
					alert("商品价格不能小于0");
					return;
				}
				if(bnum<=0){
						alert("商品数量不能小于0");
						return ;
				}
				alert(bname+bprice+bnum)
				var newtr = "<tr><td><img src='img/3.PNG' style='float:left'>"+"<p class='a1'>"+
				bname+"</p>"+"<p class='a2' style='color :red'>￥<span>"+bprice+"</span></p>"+
				"<input type='button' class='a3' value='-' onclick='res(this)'>"+
				"<span class='a4'>"+bnum+"</span>"+
				"<input type='button' class='a5' value='+' onclick='plus(this)'>"+
				"<input type='button' value='删除' class='a6' onclick='del(this)'>"+
				"<span class='a7'>"+bnum*bprice+"</span></td></tr>"
				$("table").append(newtr);
			})
		})
		
		var app = angular.module("myapp",[]);
		app.controller("myctrl",function($scope){
			
			
		})
		
		
	</script>
</body>
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