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vue 项目http 请求了一个undefined?

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vue 项目http 请求了一个undefined?

运行项目的时候出现了一个请求图片的undefined的，东西不知道是什么，到了测试环境还报404，请问这是什么，我该怎么去掉
image.png


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造成这个请求是因为在拼接图片路径时，该变量未赋值前为undefined。
先找到这个标签，标签上加一个 v-if="variable" //variable就是拼 url 的值


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