methods: { //计算总数 count: function() { var that = this; var list = this.rbars; var allcount = 0; //被选中个数 var len = list.length; //加入购物车个数 var totalmoney = 0; var discount = 0; for(var i = 0; i < len; i++) { if(list[i].ischecked) { var c = list[i].count; //个数 allcount += parseInt(c); var p = list[i].price; totalmoney += c * p; } } // that.setData({ vue.allcount = allcount, vue.totalmoney = totalmoney.toFixed(2), vue.total = (totalmoney - discount).toFixed(2) // }); //购物车显示选中的数量 // if(allcount <= 0) { // wx.removeTabBarBadge({ // index: 2, // }) // } else { // wx.setTabBarBadge({ // index: 2, // text: allcount + "", // }) // // } },是什么意思
时间: 2023-12-06 18:02:57 浏览: 25
这段代码是一个 Vue.js 的计算方法,用于计算购物车中选中的商品数量、总价和优惠金额。它遍历购物车商品列表,累加选中的商品数量和总价,并且将结果更新到 Vue 实例的数据中。最后,如果购物车中选中的商品数量大于 0,就会在小程序的底部 TabBar 上显示一个红色的数字,表示购物车中选中的商品数量。
相关问题
methods: { //计算总数 count: function() { var that = this; var list = this.rbars; var allcount = 0; //被选中个数 var len = list.length; //加入购物车个数 var totalmoney = 0; var discount = 0; for(var i = 0; i < len; i++) { if(list[i].ischecked) { var c = list[i].count; //个数 allcount += parseInt(c); var p = list[i].price; totalmoney += c * p; } } // that.setData({ vue.allcount = allcount, vue.totalmoney = totalmoney.toFixed(2), vue.total = (totalmoney - discount).toFixed(2) },帮我把上面代码添加一个为ID为gt的复选框赋值方法
可以在方法中添加如下代码:
```
// 设置ID为gt的复选框的选中状态
document.getElementById('gt').checked = true;
```
这样就可以将ID为gt的复选框设为选中状态了。请注意,这里假设在页面中已经存在一个ID为gt的复选框,否则会出现错误。
count: function() { var that = this; var list = this.rbars; var allcount = 0; //被选中个数 var len = list.length; //加入购物车个数 var totalmoney = 0; var discount = 0; for(var i = 0; i < len; i++) { if(list[i].ischecked) { var c = list[i].count; //个数 allcount += parseInt(c); var p = list[i].price; totalmoney += c * p;
This code snippet seems to be a JavaScript function called "count". It starts by creating a variable "that" which is a reference to the current object (presumably the object that this function is a method of). It then creates another variable "list" which is presumably an array of items that this function is meant to count.
The function proceeds to initialize a few more variables: "allcount" (which will keep track of the total number of selected items), "len" (which is the length of the "list" array), "totalmoney" (which will keep track of the total cost of all selected items), and "discount" (which is currently set to 0 but may be used to track any discounts later in the function).
The function then proceeds to loop through each item in the "list" array using a for loop. For each item, it checks if the "ischecked" property is true (presumably indicating that the item has been selected). If it is, the function adds the item's count and price to the "allcount" and "totalmoney" variables, respectively.
The function then ends without returning anything. It is possible that this function is meant to update some UI elements on the page (e.g. displaying the total number of selected items or the total cost), but without more context it is difficult to say for sure.