本文共 491 字,大约阅读时间需要 1 分钟。
var 可以重复声明,存在变量声明提升的现象
let 只能先声明,后使用,并且不能重复声明
function sumEventAfterQueries(A, queries){ let len = A.length; let sum = 0; let answer = []; function evenSum(A){ for(let i = 0; i < len; i++){ if(A[i] % 2 == 0){ sum += A[i]; } } return sum; } for(let item of queries){ let i = item[1]; let j = item[0]; A[i] = A[i] + j; let a = evenSum(A); answer.push(a); sum = 0; } return answer;}let A = [1,2,3,4];let queries = [[1,0],[-3,1],[-4,0],[2,3]];
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