How JavaScript uses the eval() function and the join () method of the array to achieve summation

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Use the eval () function and the join () method of the array

Var arr = [11, 12, 13, 14, 15] console.log (eval (arr.join ('+')); / / what can 65JavaScript do? It can make web pages interactive, such as responding to user clicks and providing users with a better experience. two。 You can process forms, verify user input, and provide timely feedback to save users time. 3. The page can be created dynamically according to the user's operation. 4 using JavaScript, you can set up some temporary information that cookie stores on the browser.

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