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| let arr1 = Array.from(new Array(1000000), (x, index) => { return index })
let arr2 = Array.from(new Array(500000), (x, index) => { return index + index })
let start = new Date().getTime() console.log('开始数组去重')
function distinct(a, b) { let arr = a.concat(b);
let result = [] let obj = {} for (let i of arr) { if (!obj[i]) { result.push(i) obj[i] = 1 } } return result
}
console.log('去重后的长度', distinct(arr1, arr2).length) let end = new Date().getTime() console.log('耗时', end - start + 'ms')
|