How do I change the body class via a typescript class (angular2)

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How do I change the body class via the root component?

@Component({ 
   selector: \"app\", 
   directives: [ROUTER_


                      
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                  逝去的感伤        
                
              
                            
                2020-12-14 03:09
              
            
            
                                                                       
Here you can simple use the native JavaScript in the Angular2 component to change the class of the <body> tag:-

let body = document.getElementsByTagName('body')[0];
body.classList.remove("className");   //remove the class
body.classList.add("className");   //add the class

                                                                        
                                                        
            
            
              
                
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