One, the scene
When using Ant Design, the placeholder set when using a-select and tree-select components in the form has not been displayed.
Two, cause
The a-select and tree-select components use the v-model binding value because it is requested from the background and the initial value is set "", so the placeholder does not take effect.
Three, the solution
For a-select components, v-model binding initial value may be modified to undefinedtake effect.
For tree-select components, v-model binding can be modified to an initial value nullor undefinedmay take effect.