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背景： 在 Vue 项目中使用 ECharts 图表组件时，出现了该错误信息，而且图表无法正常显示 
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vue的数据绑定在刚开始只是和内存建立联系，并没有真正的和后台的数据挂上钩，所以一开始的val.data只是一个空值，必须在之前加个if判断，确保有值以后再开始计算length
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在父组件music-list.vue中的template调用子组件scroll <scroll ref="list" @scroll="scroll" :data="
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