Invalid prop: type check failed for prop "action". Expected String with value "undefined", got Undefined found in

根据引用中的描述，当使用el-upload组件进行文件上传时，需要在action属性中写上有效的字符串值。引用中的代码示例显示，变量cinemaInfo被期望是一个对象，但是最初直接将res.data赋值给该变量，而res.data实际上是一个数组。同样地，引用也描述了一个类似的问题，变量期望接收到一个对象，但实际上赋值给变量的是一个数组。根据这些引用内容，可以推断出在问题中出现的错误是因为action属性的值为undefined，而期望的值是一个有效的字符串。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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