How to realize the summation of javascript

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The method to achieve summation in javascript: 1, summation through "function sumArr (arr) {...}" method; 2, summation through forEach traversal; 3, summation through "eval (arr.join (" + ")).

This article operating environment: windows7 system, javascript1.8.5 version, Dell G3 computer.

The method of summation in javascript

Summation method of JS array

Array summation, the general idea is to traverse the array items, and then add up.

That's what it is:

Function sumArr (arr) {var sum = 0; for (var I = 0 I)