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<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
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<body>
</body>
<script type="text/javascript">
let nums = [1, 5, 2, 4, 6, 8];
let target = 12;
function twoNum (nums, target){
let arr = [];
for(let i = 0;i < nums.length;i++){
let otherNum = target - nums[i];
let secondNum = nums.slice(i+1).filter(val => val == otherNum);
if(secondNum.length > 0){
arr.push(i, nums.indexOf(secondNum[0]));
}
}
return arr;
}
function three(nums, target){
let resultArr = [];
for(let i = 0;i < nums.length;i++){
let otherNum = target - nums[i];
let arr = twoNum(nums.slice(i+1), otherNum);
if(arr.length > 0){
resultArr.push(i, nums.indexOf(nums.slice(i+1)[arr[0]]), nums.indexOf(nums.slice(i+1)[arr[1]]));
break;
}
}
return resultArr
}
three([1, 4, 8, 12, 19, 16, 26], 24);
</script>
</html>