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输入 HTML 代码……
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function findLonelyDog(arr) {
let len = arr.length,
result;
for(let i = 0; i < len - 1; i = i + 1) {
if((arr.indexOf(arr[i])) == arr.lastIndexOf(arr[i])){
result = arr[i];
break;
}
return result;
let arr = [12,3,2,3,5,6,5,6,12];
document.write(findLonelyDog(arr));
输入 CSS 代码……