+ "<p class='addToCarBtn'" + " data-productId='" + productId + "' data-productTitle='" + productTitle+ "' data-productCurrentCount='" + productCurrentCount+ "' data-productPrice='" + productPrice+ "'data-productType='"+productType+ "'data-productGdprice='"+productGdprice+ "'data-storeProductFreight='"+storeProductFreight+ "'data-amount='"+amount+ "' οnclick='addCar(this);'>加入购物车</p>"

  + "<span class='goods' style='margin-right:10px;'><a "  + "data-productId='" + pro[0]+ "'data-productPrice='"+pro[3]+ "'href='javascript:void(0);' οnclick='delProFromCar(this);' style='color:red;'>删除</a></span>"+ "<span class='goods'>" + pro[1].substring(0,12) + "</span>"+ "<div>"+ "<p class='amount'>"+ "<i class='i_reduce del' data-productPrice="+ pro[3] +"></i>"  //奥义：要明白的一点是，XX+XX在JS里面一定会连起来，所以若写成"<i class='i_reduce del'"+" data-productPrice="+ pro[3] +"></i>"就绝壁会连在一块+ "<input class='goodsAmount' data-productPrice="+ pro[3] +" type='text' value='"+ams+"'>"+ "<i class='i_add plus' data-productPrice="+ pro[3] +"></i>"+ "</p>"+ "<span class='price'>￥<b id='price"+i+"' data-productId=" + pro[0] + " data-productName='" + pro[1] + "' data-productPrice="+ pro[3] +">" + Number(pro[3])*1000*amounts/1000 + "</b></span>"//先乘再除避免出现多位小数的情况+ "</div>"+ "</li>";   所以只有两个要注意的，一个是奥义那里，一个是属性的小''写法

又遇到此类问题深入理解一下，例子popLayout+= "<div class='tip_mask' style="+"height:"+a+'px'+">";其实属性''的写法不重要，重要的是把“XX+XX在JS里面一定会连起来”理解到位

  $("#proInfo").on("click",'.plus',function(){var count = $(this).prev().val();if(isNaN(count)){return false;}var amount = $(this).prev().attr("data-productPrice");var sum = (amount * 100)* (+count+1) / 100;$(this).prev().val(+count+1);var deletebtn=$(this).prev().parent().parent().siblings()[0]var ams=$(deletebtn).children().attr("data-productid");localStorage.setItem(ams,+count+1);$(this).parent().next().find("b").text(sum);calculatepTotalPrice();});