[ngRepeat:dupes] Duplicates in a repeater are not allowed. Use 'track by' expression to specify unique keys

错误原因在于出现相同内容。

原写为：

<li ng-repeat="log in logs" scroll-down>
    {{log}}
</li>

改写为：

<li ng-repeat="log in logs track by $index" scroll-down>
    {{log}}
</li>

加track by $index即可解决。