uni.getSystemInfoSync().statusBarHeight

<template>
    <view class="content">
        <view :style="{ height: iStatusBarHeight + 'px'}"></view>
    </view>
</template>

<script>
    export default {
        data() {
            return {
                iStatusBarHeight:0
            }
        },
        onLoad() {
            this.iStatusBarHeight = uni.getSystemInfoSync().statusBarHeight
        }
    }
</script>