补充controller，修改变量，主页bug修改

liangxiaozhen

2023-08-11 af908216bb0012fe849e3b49b3039c7ba238f8f0

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<template>
    <div class="slds-is-relative">
        <template if:true={showSpinner}>
            <lightning-spinner size="medium" variant="brand"></lightning-spinner>
        </template>
    </div>
    
</template>