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spiralOrder.js
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spiralOrder.js
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//将一个二维数组(矩阵)顺时针打印出来
///循环操作
function spiralOrder(arr){
let res = []//放一个空数组
if(arr.length === 0){
return res
}else if(arr[0].length === 0){
return res
}
let up = 0
let down = arr.length-1
let left = 0
let right = arr[0].length-1
while(true){
if(left>right){
return res
}
for(let i=left;i<=right;i++){
res.push(arr[up][i])
}
up++
if(up>down){
return res
}
for(let i=up;i<=down;i++){
res.push(arr[i][right])
}
right--
if(right<left){
return res
}
for(let i=right;i>=left;i--){
res.push(arr[down][i])
}
down--
if(down<up){
return res
}
console.log(down,up);
for(let i = down;i>=up;down--){
res.push(arr[i][left])
}
left++
}
}
let arr = [[1,2,3],[4,5,6],[7,8,9]]
console.log(spiralOrder(arr));