Vue project install is normal. When NPM run dev is started, the project cannot be started due to warnings.
Exception prompt:
(Emitted value instead of an instance of Error)
<el-row v-for="item in order.products">: component lists rendered with v-for should have explicit keys.
See https://vuejs.org/guide/list.html#key for more info.
Anomaly analysis:
On the child elements of the transition-group tag, do not use the v-for index as the key, otherwise it is the same as not using the key
Solution:
V-for specifies subscript, :key="index"