How to calculate the sum of one-dimensional array elements in JavaScript

Method: 1. Use “for(var i=0;i

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

1. Use the for statement to traverse the array and find the sum

var a = [10, 11, 12], sum = 0;
for (var i = 0; i < a.length; i ++) { 
    sum += a[i];
};
console.log(sum);  //返回33

2. Use the for in statement to traverse the array. Sum

var a = [10, 11, 12], sum = 0;
for (var i in a) {  //遍历数组
    sum += a[i];
}
console.log(sum);  //返回33

3. Use forEach to traverse the array and sum

var a = [10, 11, 12], sum = 0;
a.forEach (function (value) {
    sum += value;
});
console.log(sum);  //返回33

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