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vue2.0 怎么在循环中添加自定义属性

RT,怎么在循环中添加自定义属性,如这样的:

<li data-ins="1"><span>a</span></li>
<li data-ins="2"><span>b</span></li>
<li data-ins="3"><span>c</span></li>
<li data-ins="4"><span>d</span></li>
<li data-ins="5"><span>e</span></li>

我想设置data-ins的自定义属性,貌似不能直接用v-for去设置自定义属性啊,希望各位大大们解答一下


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<li v-for='(item,index) in arr' :data-ins="index">{{index}}</li>

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