angular ng-select ng-option

for array data sources:

    • label for value in array
    • select as label for value in array
    • label group by group for value in array
    • select as label group by group for value in array track by trackexpr

for object data sources:

    • label for (key , value) in object
    • select as label for (key , value) in object
    • label group by group for (key, value) in object
    • select as label group by group for (key, value) in ob
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原文地址：https://www.cnblogs.com/access520/p/6877373.html