微信小程序购物车产品计价

微信小程序购物车产品计价：

问题：当选中商品，价格累加时会出现无限循环小数

解答：在计算前先parseFloat(变量)，再计算的最后使用(变量).toFixed(2)保留两位小数

例如：

jiaCart:function(e){

var pid = e.currentTarget.id;

var pic = parseFloat(e.currentTarget.dataset.pic);

var cartList=this.data.cartList;

var ex = false;

for(var i=0;i<cartList.length;i++){

if(cartList[i].pid==pid){

cartList[i].num++;

ex = true;

}

}

if(!ex){

this.data.cartList.push({ pid: pid, num: 1 });

}

var cartPics = (this.data.cartPic+pic).toFixed(2);

this.setData({

cartPic:parseFloat(cartPics),

cartNum:this.data.cartNum+1,

cartList:cartList

});

},

jianCart:function(e){

var pid = e.currentTarget.id;

var pic = parseFloat(e.currentTarget.dataset.pic);

var cartList=this.data.cartList;

for(var i=0;i<cartList.length;i++){

if(cartList[i].pid==pid){

cartList[i].num--;

if(cartList[i].num<=0){

cartList.splice(i,1);

}

}

}

var showCart=this.data.cartNum;

if(showCart==1 && (this.data.cartNum-1)<=0){

this.setData({

showCart:0

});

}

var cartPics = (this.data.cartPic-pic).toFixed(2);

this.setData({

cartPic:parseFloat(cartPics),

cartNum:this.data.cartNum-1,

cartList:cartList

});

}