补充controller，修改变量，主页bug修改

liangxiaozhen

2023-08-11 af908216bb0012fe849e3b49b3039c7ba238f8f0

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<template>
    <p>Enter course name:</p>
    <lightning-input
        value={courseName}
        onchange={handleChange}
    ></lightning-input>
    <p class="course-name">Course name is: {courseName}</p>
</template>