lavezzi1

.abs-bg {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url(img/dsc0654_2x.jpg) center top;
    background-size: cover;
}

props: {
    value: [String, Number, Object, Array]
}
data() {
    return {
       mutableValue: this.value
    };
}

<li v-for="(item, index) in items" @click="foo(item)">{{ `item ${index + 1}` }}</li>