v-bind: 简写为 : 属性要用v-bind

				<el-collapse-item v-for="(val,index) in problemList" :key="index" :title="val.problemTitle">
					<div v-html="val.problemContent" style="color:#38adff">{{ val.problemContent }}</div>
								<video width="320" height="240" controls="controls" v-if='val.videoUrl'>
								<source :src="val.webUrl + val.videoUrl +''" type="video/ogg">
								Your browser does not support the video tag.
								</video>
				</el-collapse-item>
			</el-collapse>
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