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&& 和 || 都有短路的作用

function kWeakestRows(mat, k){  let sum = 0;  let len0 = mat.length;  let len1 = mat[0].length;  let arr = [];  let answer = [];  for(let i = 0; i < len0; i++){    for(let j = 0; j < len1 && mat[i][j] != 0; j++){      sum += mat[i][j];    }    arr[i] = [];    arr[i][0] = i;    arr[i][1] = sum;    sum = 0;  }  arr.sort((a,b) => a[1]-b[1])  for(let i = 0; i < k; i++){    answer[i] = arr[i][0];  }  return answer;}let mat = [[1,0,0,0], [1,1,1,1], [1,0,0,0], [1,0,0,0]];let k = 4;

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