How to use for summation in JavaScript

Method: 1. Use the var statement to declare an array that needs to be summed and a variable with a value of 0; 2. Use "for(var i=0;i

The operating environment of this tutorial: Windows 10 system, JavaScript version 1.8.5, Dell G3 computer.

How to use for summation in JavaScript

In js, you can use for to loop arrays and realize array values ​​through the "=" operator of accumulation.

Create a new html file, named test.html, to explain how js uses a for loop to find the sum of an array.

In the js tag, create an array arr, and initialize a variable total, set to 0. Iterate over the array arr using a for loop where i is used as the index of the array. Through the "=" operator, the accumulation of array elements is achieved.

Finally, use the write method to output the accumulated results. Open the test.html file in the browser and view the results.

Summary:

1. Create an array arr, and initialize a variable total, set to 0.

2. Use a for loop to traverse the array arr, where i is used as the index of the array.

3. In the for loop, the "=" operator is used to implement the accumulation of array elements.

4. Use the write method to output the accumulated results.

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