uni-app h5动态设置元素的高度

<view class="page-box">
	<view class="fixed-box"></view>
	<scroll-view :style="{height:scrollHeight}" scroll-y="true"></scroll-view>
</view>

需求：根据屏幕的高度和fixed-box的高度计算scroll-view的高度

<script lang="ts" setup>
	const scrollHeight = ref('')
	const calculateHeight = ()=>{
		let windowHeight = null
	    let fixedHeight = 0
	    let paginationHeight = 0
	    uni.getSystemInfo({ //获取屏幕高度
	      success: res => {
	      	console.log("屏幕高度：", res.windowHeight) //res.windowHeight是返回的屏幕高度
	        windowHeight = res.windowHeight; 
	      }
	    });
	    // 获取元素高度
	    let query = uni.createSelectorQuery().in(instance); 
	    query.select('.fixed-box').boundingClientRect();
	    query.exec(res => {
	       console.log('元素高度',res[0].height)// 返回的值可以用作动态修改元素的高度
	       fixedHeight = res[0].height; 
	      
	    });
	    scrollHeight.value = windowHeight - fixedHeight + 'px'
		}
	
</script>