使用*ngFor访问对象的键和值
keyvalue*ngFor
ng-repeat="(key, value) in demo"
<ul>
<li *ngFor='#key of demo'>{{key}}</li></ul>demo = {
'key1': [{'key11':'value11'}, {'key12':'value12'}],
'key2': [{'key21':'value21'}, {'key22':'value22'}],
}key1key2*ngFor
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