[1,1],[2,2],[3,3],[4,4]// 
[1,1],[2,2],[3,3],[4,4]// function trans (arr) {
let result = []
arr.forEach(item => {
item.forEach((d, i)=> {
let a = result[i] = result[i] || []
a.push(d)
})
})
return result
}
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