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class属性知识点：
匹配类名元素：$('.class')
添加指定的类：$().addClass(class|fn)
删除指定的类：$().removeClass([class|fn])
检查元素是否含有某个特定的类：$().hasClass(class) 如果有，则返回true
切换类名：$().toggleClass(class|fn[,sw]) 如果存在（不存在）就删除（添加）一个类
案例：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>1.23 点击商品选中效果（要求：控制台输出商品详情）</title>
<script src="https://lib.baomitu.com/jquery/3.3.1/jquery.min.js"></script>
<style>
*{margin: 0;padding: 0;}
.box{width: auto;border: 1px solid red;display: inline-block;margin: 50px;}
.title{text-align: center;line-height: 40px;background: red;color: #fff;}
.item,.item1{line-height: 28px;font-size: 14px;padding: 5px 10px;}
.item b,.item1 b{width: 64px;display: inline-block;}
.item span{margin-right: 10px;border: 1px solid #b9b9b9;width: 80px;text-align: center;display: inline-block;}
.item span.on{border:1px solid red;color: red;}
.item1 input{width: 50px;height: 28px;}
.btn{border: none;line-height: 30px;background: red;color: #fff;margin: 0 0 30px 77px;padding: 0 15px;}
</style>
</head>
<body>
<div class="box">
<p class="title">请选择信息后加入购物车</p>
<div class="goods">
<p class="item" name="version">
<b>版本</b>
<span>A2001</span>
<span>A111</span>
<span>A222</span>
</p>
<p class="item" name="color">
<b>机身颜色</b>
<span>白色</span>
<span>黑色</span>
<span>橙色</span>
</p>
<p class="item" name="type">
<b>套餐类型</b>
<span>标配</span>
<span>套餐一</span>
<span>套餐2</span>
</p>
<p class="item" name="ram">
<b>运行内存</b>
<span>3G</span>
<span>6G</span>
<span>9G</span>
</p>
<p class="item" name="rom">
<b>机身内存</b>
<span>16G</span>
<span>32G</span>
<span>64G</span>
</p>
<p class="item" name="area">
<b>产地</b>
<span>中国大陆</span>
<span>港澳台</span>
</p>
<p class="item" name="price">
<b>价格</b>
<span>666元</span>
</p>
<p class="item1" name="number">
<b>数量</b>
<input type="number" name="number" id="number" min="1" value="1" />
</p>
<button class="btn" id="btn">加入购物车</button>
</div>
</div>
<script>
$('.item span').click(function(){
if($(this).hasClass('on')){
$(this).removeClass('on');
}else{
$(this).addClass('on').siblings('span').removeClass('on');
}
})
$('#btn').click(function(){
var flag = true;
var goods={};
var arr = [];
$('.item').each(function(){
arr.push($(this).children('span.on').length);
if($(this).children('span.on').length != 1){
flag = false;
}else{
var key = $(this).attr('name');
var val = $(this).children('span.on').html();
goods[key] = val;
}
})
if($('#number').val() <= 0 ){
alert('请选择***数量!');
flag = false;
}else{
goods['number'] = $('#number').val();
console.log(goods);
}
if(flag){
alert('成功加入购物车');
}
})
</script>
</body>
</html>效果图：
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