前言：将数组[[1, 2], [2, 3], [1, 4]] 转为一维数组，且去重

1. 使用 Array.prototype.flat() 和 Set

const twoDArray = [[1, 2],[2, 3],[1, 4],];const oneDArray = Array.from(new Set(twoDArray.flat()));console.log(oneDArray); // [1, 2, 3, 4]

2. 先展开二维数组，再使用 Array.prototype.reduce() 去重

const twoDArray = [[1, 2],[2, 3],[1, 4],];const flatArray = twoDArray.flat();const uniqueArray = flatArray.reduce((accumulator, currentValue) => {if (!accumulator.includes(currentValue)) {accumulator.push(currentValue);}return accumulator;}, []);console.log(uniqueArray); //  [1, 2, 3, 4]

3. 使用 for 循环和 indexOf 方法

const twoDArray = [[1, 2],[2, 3],[1, 4],];const flatArray = twoDArray.flat();let result = [];for (let i = 0; i < flatArray.length; i++) {if (result.indexOf(flatArray[i]) === -1) {result.push(flatArray[i]);}}console.log(result); //  [1, 2, 3, 4]