How to input N data and find the average using JavaScript

Implementation steps: 1. Define N variables to store the numbers entered by the user, with the syntax "var n1, n2,..nN;"; 2. Use the prompt() function to obtain the numbers entered by the user and Assign values ​​to N variables, the syntax is "prompt('Please enter data')*1"; 3. Use the " " operator to add and sum the N numbers entered by the user, the syntax is "n1 n2 ... nN"; 4 , use the "/" operator to divide the summation result by N to obtain the average, and the syntax is "divide the summation result/N".

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

In javascript, you can use the prompt() function, " " and "/" operators to input N data and find the average

Implementation steps:

Step 1: Define N variables to store the numbers entered by the user

var num1,num2,..numN;

Step 2: Use the prompt() function Obtain the number entered by the user and assign it to two variables. The

prompt() method is used to display a dialog box that prompts the user for input. The function return value is a string.

When the user input is a number or Boolean type, string type will always be returned. If you want to keep the type unchanged, you need to perform type conversion.

num1 = prompt('请输入第一个数字') * 1;
num2 = prompt('请输入第二个数字') * 1;
...
numN = prompt('请输入第N个数字') * 1;

Step 3: Use the " " operator to add the N numbers entered by the user

num1 + num2 + ... +numN

Step 4: Use the "/" operator Divide the summation result by N to obtain the average number

将求和结果 / N

Implementation code: The user inputs 3 data to find the average

var num1 = prompt('请输入第一个数字') * 1;
var num2 = prompt('请输入第二个数字') * 1;
var num3 = prompt('请输入第三个数字') * 1;
var sum = num1 + num2 + num3;
console.log("用户输入3个数据的平均数："+(sum/3));

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