Detailed explanation on how to calculate the total price using JS

Yesterday, I connected the data and found that the total price of a product needs to be calculated. The quantity of the product is uncertain, the price of the product is uncertain, and the type of the product is uncertain. It is a bit confusing. After much thought, I did not expect to find a simple way to write it. Finally, I provide a simple way. Think about it.

First create two arrays for product quantity and product price;

let pro_num=[];

let pro_price=[];

and then create a new one An array contains the total price of a single product;

let pro_total_price=[];

After that, all the product quantities are obtained, the product price is put into the array, and the two arrays are looped;

  for(let i=0;i<pro_num.length;i++){
     for(let k=0;k<pro_price.length;k++){
         if(i==k){
            let alone_Total_price =parseFloat(pro_num[i])*parseFloat(pro_price[k]); //计算单个商品的总价
            pro_total_price.push(alone_Total_price); //获得所有的单个商品的总价
       }  
 }
   let sum=0;//初始化总价
   for(let i=0;i<pro_total_price.length;i++){
    sum+=pro_total_price[i] //单个总价相加   
 }
let total_price=sum.toFixed(2) //保留两位小数

If there are numerical changes or multiple total price calculations, clear the single total price array

pro_total_price.splice(pro_total_price.length,0);

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