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RT, the route loads different pages, so how to load the css corresponding to these pages
For example

.state('active',{
    url : '/active',
    templateUrl : 'tpls/active.html'
})

How should I load the corresponding css? Some people recommend that I mix the css in one file and load it from the beginning, but this is too coupling, and it is easy to cause conflicts in one file, and it is easily affected by other attributes. If you add a prefix, the class name is too long. It gives me a headache just looking at it...