在数组中存储和处理范围值

Question

将范围值存储为变量并循环显示它时，我实际上无法更改值，例如，

<ion-content>
    <ul class="list">
        <a href="" class="item positive-bg" nav-clear menu-close ng-click="login()">Login</a>
        <a href="#/app/search" class="item calm-bg" nav-clear menu-close>Search</a>
        <a href="#/app/browse" class="item assertive-bg" nav-clear menu-close>Browse</a>
        <a href="#/app/playlists" class="item balanced-bg" nav-clear menu-close>Playlists</a>
    </ul>
</ion-content>

只有在我做的时候它才会改变

valsf(i, h) = (valsf(i - 1, h) + valsf(i + 1, h)) / 2 

为什么会这样？