题解 | #查找数组元素位置#
数组求和
http://www.nowcoder.com/practice/cc3ce199461c4c4cb8f63db61d7eba30
function sum(arr) {
let add = 0;
for (let i = 0; i < arr.length; i++) {
add += arr[i];
}
return add;
}
let arr = [1, 2, 3, 4];
document.write(sum(arr));
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