补充controller，修改变量，主页bug修改

liangxiaozhen

2023-08-11 af908216bb0012fe849e3b49b3039c7ba238f8f0

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<template>
    <p>Click the next button to generate and send the document:</p>
    <lightning-button
        onclick={handleButtonClick}
        label="Send PDF"
        class="slds-var-m-top_small"
    ></lightning-button>
</template>